CN107689215B - Backlight adjusting method and device of intelligent display equipment - Google Patents

Backlight adjusting method and device of intelligent display equipment Download PDF

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Publication number
CN107689215B
CN107689215B CN201610643750.XA CN201610643750A CN107689215B CN 107689215 B CN107689215 B CN 107689215B CN 201610643750 A CN201610643750 A CN 201610643750A CN 107689215 B CN107689215 B CN 107689215B
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value
backlight
contrast
brightness
determining
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CN107689215A (en
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刘丽丽
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Hisense Visual Technology Co Ltd
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Qingdao Hisense Electronics Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the invention provides a backlight adjusting method and device of intelligent display equipment, wherein the intelligent display equipment is provided with a plurality of screen areas, and the method comprises the following steps: acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; determining a variance characteristic value of the current frame image according to the backlight value of each screen area; determining a corresponding compensation value according to the backlight value and the variance characteristic value; and adjusting the backlight brightness of the current screen area by adopting the backlight value, and adjusting the display of the next frame of image by adopting the compensation value. The embodiment of the invention can prevent the saturation distortion of the image, ensure the brightness of the image, improve the permeability and the detail level of the display image, and more accurately enhance the image quality according to different image contents.

Description

Backlight adjusting method and device of intelligent display equipment
Technical Field
The invention relates to the technical field of intelligent display equipment, in particular to a backlight adjusting method and a backlight adjusting device.
Background
With continuous progress of scientific technology, the global 4K television market is growing rapidly, the goods output is estimated to reach 6065 thousands before 2017, the proportion of the goods in the whole television market is more than 24%, the 4K television adopts a Light-Emitting Diode (LED) as a backlight source, a liquid crystal display is used as an ultrathin television of a display screen, and the current resolution is 4096 × 2160 at most; 4K television has become an important milestone in the development of the television industry. The 4K television needs to have the characteristics of ultrathin property, environmental protection, energy conservation, excellent image quality and high contrast.
Most of 4K televisions in the market are in a side-in type light emitting mode, and light can be uniformly distributed on the whole television plane through a light guide plate. High contrast and good picture quality is achieved by backlight adjustment techniques. The current backlight adjusting technology mainly changes the brightness of each LED lamp by adjusting the current of each LED lamp, so that the backlight at a darker area in a picture is correspondingly darkened, and finally, a bright and bright visual effect is achieved.
A commonly used backlight adjustment technique is 2D dynamic backlight adjustment. The 2D dynamic backlight adjustment is to divide the whole backlight area into a plurality of horizontal and vertical partitions, and perform 2-dimensional adjustment of independent partition backlight brightness for each partition according to the brightness of image signals in the partition. In the prior art, the backlight value and the compensation value are calculated according to the image content of each frame, but if the backlight value and the compensation value are calculated by using the prior art method in a high-contrast picture with severe brightness change or a common picture with mild brightness change, all picture contents cannot be considered, and the image quality is difficult to be enhanced more accurately.
Disclosure of Invention
In view of the above problems, embodiments of the present invention are proposed to provide a backlight adjusting method of a smart display device and a corresponding backlight adjusting apparatus of a smart display device, which overcome or at least partially solve the above problems.
In order to solve the above problem, an embodiment of the present invention discloses a backlight adjusting method for an intelligent display device, where the intelligent display device has multiple screen areas, and the method includes:
acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
determining a variance characteristic value of the current frame image according to the backlight value of each screen area;
determining a corresponding compensation value according to the backlight value and the variance characteristic value;
and adjusting the backlight brightness of the current screen area by adopting the backlight value, and adjusting the display of the next frame of image by adopting the compensation value.
Preferably, when the current frame image is output in the plurality of screen regions, the step of obtaining the brightness characteristic value of each screen region includes:
calculating the brightness value of each pixel of the current frame image;
respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
Preferably, the preset backlight threshold interval includes a first backlight threshold interval, a second backlight threshold interval, a third backlight threshold interval and a fourth backlight threshold interval, and the step of determining the corresponding backlight value according to the preset backlight threshold interval to which the brightness feature value of the current screen region belongs includes:
when the preset backlight threshold interval to which the brightness characteristic value belongs is a first backlight threshold interval, determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area;
when the preset backlight threshold interval to which the brightness characteristic value belongs is a second backlight threshold interval, determining the brightness average value of the corresponding screen area as a backlight value;
when the preset backlight threshold interval to which the brightness characteristic value belongs is a third backlight threshold interval, determining the value range of the backlight value as the interval between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area;
and when the preset backlight threshold interval to which the brightness characteristic value belongs is a fourth backlight threshold interval, determining the maximum brightness value of the corresponding screen area as the backlight value.
Preferably, the step of determining the variance characteristic value of the current frame image according to the backlight values of the respective screen regions comprises:
acquiring backlight values of the plurality of screen areas;
calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
and analyzing the backlight values of the plurality of screen areas and the backlight average value by adopting a variance formula to obtain a variance characteristic value of the current frame image.
Preferably, each frame of image has a scene contrast, the scene contrast includes a first contrast, a second contrast and a third contrast, the first contrast is greater than the second contrast, the second contrast is greater than the third contrast, and the step of determining the corresponding compensation value according to the backlight value and the variance characteristic value includes:
judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
when the scene contrast of the current frame image is a first contrast, determining a compensation value as a backlight maximum value according to the backlight value of the corresponding screen area, or determining the value range of the compensation value as the range between the backlight value of the corresponding screen area and the backlight maximum value;
when the scene contrast of the current frame image is a second contrast, determining a compensation value as a backlight maximum value;
and when the scene contrast of the current frame image is a third contrast, determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum backlight value.
Preferably, the step of determining the scene contrast of the current frame image according to the backlight average value and the variance feature value includes:
judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
if not, determining the scene contrast of the current frame image as a third contrast;
if yes, judging whether the backlight average value is larger than a preset average threshold value;
if so, determining the scene contrast of the current frame image as a second contrast;
if not, determining that the scene contrast of the current frame image is the first contrast.
Preferably, when the scene contrast of the current frame image is the first contrast, determining the compensation value as the maximum backlight value according to the backlight value of the corresponding screen region, or determining the value range of the compensation value as the range between the backlight value of the corresponding screen region and the maximum backlight value includes:
and judging the preset compensation threshold value interval to which the backlight value belongs.
Preferably, the preset compensation threshold interval includes a first compensation threshold interval, a second compensation threshold interval and a third compensation threshold interval, and the step of determining the compensation value as the maximum backlight value according to the backlight value when the scene contrast of the current frame image is the first contrast, or determining the value range of the compensation value as the range between the backlight value and the maximum backlight value of the corresponding screen region further includes:
when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, determining that the corresponding compensation value is the maximum backlight value;
and when the preset compensation threshold interval to which the backlight value belongs is a second compensation threshold interval, determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum backlight value.
The embodiment of the invention also discloses a backlight adjusting device of the intelligent display equipment, the intelligent display equipment is provided with a plurality of screen areas, and the device comprises:
the brightness characteristic value acquisition module is used for acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
the backlight value determining module is used for determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
the variance characteristic value determining module is used for determining the variance characteristic value of the current frame image according to the backlight value of each screen area;
the compensation value determining module is used for determining a corresponding compensation value according to the backlight value and the variance characteristic value;
and the backlight brightness adjusting module is used for adjusting the backlight brightness of the current screen area by adopting the backlight value and adjusting the display of the next frame of image by adopting the compensation value.
Preferably, the luminance characteristic value obtaining module includes:
the brightness value calculation module is used for calculating the brightness value of each pixel of the current frame image;
the maximum value and average value calculating module is used for respectively calculating the maximum value and the average value of the brightness of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining module is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
Preferably, the preset backlight threshold interval includes a first backlight threshold interval, a second backlight threshold interval, a third backlight threshold interval and a fourth backlight threshold interval, and the backlight value determining module includes:
the first backlight value determining submodule is used for determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the first backlight threshold interval;
the second backlight value determining submodule is used for determining the brightness average value of the corresponding screen area as the backlight value when the preset backlight threshold value interval to which the brightness characteristic value belongs is the second backlight threshold value interval;
the third backlight value determining submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the third backlight threshold interval;
and the fourth backlight value determining submodule is used for determining the maximum brightness value of the corresponding screen area as the backlight value when the preset backlight threshold interval to which the brightness characteristic value belongs is the fourth backlight threshold interval.
Preferably, the variance eigenvalue determination module comprises:
the backlight value acquisition submodule is used for acquiring backlight values of the plurality of screen areas;
the backlight average value and backlight maximum value calculation submodule is used for calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
and the variance characteristic value obtaining submodule is used for analyzing the backlight values and the backlight average value of the plurality of screen areas by adopting a variance formula to obtain the variance characteristic value of the current frame image.
Preferably, each frame image has a scene contrast including a first contrast, a second contrast and a third contrast, the first contrast is greater than the second contrast, the second contrast is greater than the third contrast, the compensation value determining module includes:
the scene contrast judging submodule is used for judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
a first compensation value determining sub-module, configured to determine, when the scene contrast of the current frame image is a first contrast, a compensation value as a maximum backlight value according to a backlight value of a corresponding screen region, or determine a value range of the compensation value as between the backlight value of the corresponding screen region and the maximum backlight value;
the second compensation value determining submodule is used for determining the compensation value as the backlight maximum value when the scene contrast of the current frame image is the second contrast;
and the third compensation value determining sub-module is used for determining the value range of the compensation value to be between the backlight value and the backlight maximum value of the corresponding screen area when the scene contrast of the current frame image is the third contrast.
Preferably, the scene contrast determination sub-module includes:
the variance characteristic value judging unit is used for judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
a third contrast determining unit, configured to determine, if the current frame image is not the second scene image, that the scene contrast of the current frame image is the third contrast;
the backlight average value judging unit is used for judging whether the backlight average value is larger than a preset average threshold value or not if the backlight average value is larger than the preset average threshold value;
the second contrast determining unit is used for determining the scene contrast of the current frame image as the second contrast if the scene contrast of the current frame image is the second contrast;
and the first contrast determining unit is used for determining the scene contrast of the current frame image as the first contrast if the current frame image is not the first scene contrast.
Preferably, the first contrast determination unit includes:
and the backlight value judging subunit is used for judging the preset compensation threshold interval to which the backlight value belongs.
Preferably, the preset compensation threshold interval includes a first compensation threshold interval, a second compensation threshold interval, and a third compensation threshold interval, and then the first contrast determination unit further includes:
a fourth compensation value determining subunit, configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, that the corresponding compensation value is the maximum backlight value;
and the fifth compensation value determining subunit is configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the second compensation threshold interval, that the value range of the compensation value is between the backlight value of the corresponding screen area and the maximum backlight value.
The embodiment of the invention has the following advantages:
in the embodiment of the invention, the brightness characteristic value of the current frame image of each screen area is calculated, the corresponding backlight value is determined according to the preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs, and the corresponding compensation value is determined by adopting the backlight variance value and the backlight value of the current frame image; the method can obtain a better lighttight picture effect, prevent image saturation distortion, ensure picture brightness, improve the permeability and detail level of a display picture, and more accurately enhance the image quality according to different picture contents.
Drawings
Fig. 1 is a flowchart illustrating a first step of a backlight adjusting method of an intelligent display device according to an embodiment of the present invention;
FIG. 2 is a block diagram of a process for adjusting the backlight value and the compensation value of a next frame image according to the present invention;
fig. 3 is a flowchart illustrating steps of a second embodiment of a method for adjusting backlight of an intelligent display device according to the present invention;
FIG. 4 is a flowchart illustrating steps for determining scene contrast according to an embodiment of the present invention;
fig. 5 is an internal structural view of an intelligent display device according to an embodiment of the present invention;
FIG. 6 is a flow chart of adjusting backlight brightness according to an embodiment of the present invention;
fig. 7 is a block diagram of a fourth embodiment of a backlight adjusting apparatus of an intelligent display device according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
One of the core concepts of the embodiments of the present invention is to calculate the luminance values of pixels in a current frame image of a plurality of screen regions to obtain luminance characteristic values, where the luminance characteristic values reflect the difference between the maximum luminance of the pixels and the average luminance of the pixels, and the characteristic is the ratio of high-luminance pixels and low-luminance pixels of image content, which may represent the luminance contrast of the image.
Example one
Referring to fig. 1, a flowchart illustrating a first step of a backlight adjusting method of an intelligent display device according to an embodiment of the present invention is shown, where the intelligent display device has a plurality of screen areas, and the method specifically includes the following steps:
step 101: acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
in the embodiment of the present invention, the intelligent display device may be any liquid crystal display device that uses a light emitting diode as a backlight light source, such as a computer display and a high definition television, and the embodiment of the present invention is not limited at all.
The method comprises the following steps of calculating the brightness value of a current frame image pixel to obtain the brightness characteristic value of each screen area, wherein when the current frame image is output in the plurality of screen areas, the step of obtaining the brightness characteristic value of each screen area comprises the following sub-steps:
step S1011: calculating the brightness value of each pixel of the current frame image;
step S1012: respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
step S1013: and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
The brightness value in step S1011 may be a maximum value of an image pixel point in a three-channel (RGB) color mode; for example, if the color depth of the image is 8 bits (bit) and one pixel point of the image is (130, 64, 82), the maximum value 130 of the pixel point is taken as the brightness value of the pixel point.
Further, the brightness maximum value and the brightness average value of a plurality of screen areas are calculated by adopting the brightness values, and the brightness special value is used for representing the contrast; for example, under the condition that the image color depth is 8 bits (bit), 2450 pixels are provided in the corresponding screen region, wherein the brightness value of 500 pixels is 176, and the brightness of other pixels is lower than 176, the maximum brightness value of the screen region is considered to be 176; similarly, under the above conditions, the average brightness value of 2450 pixels in the corresponding screen region can be calculated.
Specifically, after the maximum brightness value and the average brightness value of each screen region are obtained through calculation, difference operation is performed on the maximum brightness value and the average brightness value of each screen region respectively to obtain a brightness characteristic value of each screen region, for example, when the maximum brightness value of the screen region is 176 and the average brightness value of the screen region is 108, the brightness characteristic value of the screen region is 68; and calculating the brightness characteristic values of all screen areas.
Step 102: determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
in practical applications, the setting of the preset backlight threshold interval may be set according to the corresponding image depth, for example, under the condition that the image depth is 8 bits. The preset backlight threshold interval may be divided into a first backlight threshold interval [0, 20 ], a second backlight threshold interval [20, 80), a third backlight threshold interval [80, 220), and a fourth backlight threshold interval [220, 255], where it is to be noted that the above distinguishing manner is only an example of values of the preset backlight threshold interval in the embodiment of the present invention, and the present invention is not limited to this. On the intelligent display device, assuming that a screen of the intelligent display device is divided into N screen regions, where N >1, calculating brightness characteristic values of a current frame image displayed in all the N screen regions at present, comparing all the brightness characteristic values with the size of an endpoint of the preset backlight threshold interval, and determining the preset backlight threshold interval to which the brightness characteristic values of the N screen regions belong, so as to obtain N backlight values, for example, assuming that the brightness characteristic value of the current screen region is 68, determining that the preset backlight threshold interval corresponding to the brightness characteristic value of the current screen region is a second backlight threshold interval, and repeating the above determination process to obtain a plurality of preset backlight threshold intervals corresponding to the brightness characteristic values; further, the embodiment of the present invention determines values of different backlight values according to the different backlight threshold intervals.
Step 103: determining a variance characteristic value of the current frame image according to the backlight value of each screen area;
specifically, the determining the variance characteristic value of the current frame image according to the backlight value of each screen region includes the following sub-steps:
step S1031: acquiring backlight values of the plurality of screen areas;
step S1032: calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
step S1033: and analyzing the backlight values of the plurality of screen areas and the backlight average value by adopting a variance formula to obtain a variance characteristic value of the current frame image.
Specifically, after N backlight values are obtained, a mean value formula, a maximum value formula, and a variance formula are applied to the backlight values, and backlight mean values, backlight maximum values, and variance characteristic values of the N backlight values are obtained through calculation, for example, 8 backlight values are obtained: 45. 85, 14, 96, 152, 124, 240, 218 according to the mean value formula, the maximum value formula, and the variance formula, the backlight average is 122, the backlight maximum value is 240, and the variance characteristic value is 5460.
Step 104: determining a corresponding compensation value according to the backlight value and the variance characteristic value;
in the embodiment of the invention, the scene contrast of the current frame image is judged by adopting the backlight average value and the variance characteristic value, wherein the scene contrast represents the overall brightness and the local contrast of the image, the scene contrast is divided into a first contrast, a second contrast and a third contrast, different scene contrasts represent different image contents, and after the scene contrast of the current frame image is determined, a compensation value is determined according to the scene contrast of the current frame image.
Step 105: and adjusting the backlight brightness of the current screen area by adopting the backlight value, and adjusting the display of the image by adopting the compensation value.
The backlight value is output to a corresponding control circuit to carry out drive control on the light emitting diode; lightening a light emitting diode of a corresponding screen area, and adjusting the backlight brightness of the current screen area; and further, outputting the compensation value to a corresponding liquid crystal control circuit, compensating the next frame image point by point, and adjusting the display of the next frame image in a corresponding screen area.
In the embodiment of the invention, the brightness characteristic value of the current frame image of each screen area is calculated, the corresponding backlight value is determined according to the preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs, and the corresponding compensation value is determined by adopting the backlight variance value and the backlight value of the current frame image; .
Example two
Referring to fig. 3, a flowchart illustrating a second step of an embodiment of a backlight adjusting method for an intelligent display device according to an embodiment of the present invention is shown, where the intelligent display device has a plurality of screen areas, and the method specifically includes the following steps:
step 201: acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
in this embodiment of the present invention, on the intelligent display device, a screen of the intelligent display device may be divided into N screen regions, where N >1, and by calculating a luminance value of a pixel of a current frame image, it may be understood that each frame image is divided into N sub-images by the N screen regions, each screen region has a corresponding sub-image, in other words, obtaining luminance characteristic values of the N screen regions may be understood as obtaining luminance characteristic values of the N corresponding sub-images, and a specific process of obtaining the luminance characteristic values of the N screen regions is as follows: calculating the brightness value of each pixel of the current frame image; respectively calculating the maximum brightness value and the average brightness value of the N screen areas by adopting the brightness value of each pixel; and respectively carrying out difference operation on the brightness maximum value and the brightness average value of the N screen areas to obtain the brightness characteristic values of the N screen areas.
For example, the brightness value may be the maximum value of an image pixel in a three-channel (RGB) color mode; for example, if the color depth of the image is 8 bits (bit) and one pixel point of the image is (130, 64, 82), the maximum value 130 of the pixel point is taken as the brightness value of the pixel point.
Further, the maximum brightness value and the average brightness value of the N screen regions are calculated by using the above brightness values, for example, under the condition that the image color depth is 8 bits (bit), 2450 pixels are provided in a corresponding screen region, wherein the brightness value of 500 pixels is 176, and the brightness of other pixels is lower than 176, the maximum brightness value of the screen region is considered to be 176; similarly, under the above conditions, the average brightness value of 2450 pixels in the corresponding screen region can be calculated; after the maximum brightness value and the average brightness value of each screen region are obtained through calculation, difference operation is respectively performed on the maximum brightness value and the average brightness value of each screen region to obtain a brightness characteristic value of each screen region, for example, if the maximum brightness value of the screen region is 176 and the average brightness value of the screen region is 108, the brightness characteristic value of the screen region is 68; and sequentially calculating the brightness characteristic values of the N screen areas.
Step 202: determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
it should be noted that, the luminance characteristic values of the current frame image displayed in all the N current screen regions are calculated, the end points of all the luminance characteristic values and the preset backlight threshold value interval are compared, and the preset backlight threshold value interval to which the luminance characteristic values of the N current screen regions belong is judged, so that N backlight values can be obtained. The step of determining the corresponding backlight value according to the preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs specifically includes the following substeps:
substep S2021: when the preset backlight threshold interval to which the brightness characteristic value belongs is a first backlight threshold interval, determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area;
substep S2022: when the preset backlight threshold interval to which the brightness characteristic value belongs is a second backlight threshold interval, determining the brightness average value of the corresponding screen area as a backlight value;
substep S2023: when the preset backlight threshold interval to which the brightness characteristic value belongs is a third backlight threshold interval, determining the value range of the backlight value as the interval between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area;
substep S2024: and when the preset backlight threshold interval to which the brightness characteristic value belongs is a fourth backlight threshold interval, determining the maximum brightness value of the corresponding screen area as the backlight value.
For example, the brightness characteristic value of the corresponding screen area is 68, and the setting of the preset backlight threshold interval may be set according to the corresponding image depth, for example, under the condition that the image depth is 8 bits. The preset backlight threshold interval may be divided into a first backlight threshold interval [0, 20 ], a second backlight threshold interval [20, 80), a third backlight threshold interval [80, 220), and a fourth backlight threshold interval [220, 255], where it is to be noted that the above distinguishing manner is only an example of values of the preset backlight threshold interval in the embodiment of the present invention, and the present invention is not limited to this.
For example, when the luminance characteristic value of the corresponding screen region is 68, the preset backlight threshold interval of the corresponding screen region may be obtained as the second backlight threshold interval, and the luminance average value of the corresponding screen region is determined as the backlight value, where BL ═ LocalavgWherein BL is backlight value, LocalavgIs the average value of brightness; determining the backlight value to be 108;
when the preset backlight threshold interval of the corresponding screen area is the first backlight threshold interval, determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area, and further determining the backlight value according to the following formula: BL ═ aLocalavgWherein BL is backlight value, LocalavgThe brightness average value is a brightness average value, a is a first adjusting factor, a is smaller than 1 and larger than 0, and the brightness average value is set according to the requirements of a user;
when the preset backlight threshold interval of the corresponding screen area is a third backlight threshold interval, determining the value range of the backlight value as the interval between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area, and further determining the backlight value according to the following formula: BL ═ Localavg+ a Diff + b Diff2, where BL is the backlight value, LocalavgThe average value of the brightness, Diff is a brightness characteristic value, a is a first adjusting factor, b is a second adjusting factor, a and b are less than 1 and more than 0, and the average value of the brightness is set according to the requirements of users;
when the preset backlight threshold interval of the corresponding screen area is the fourth backlight threshold interval, determining the value range of the backlight value as the interval between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen areaAnd determining the backlight value: BL ═ LocalmaxWherein BL is backlight value, LocalmaxIs the maximum value of the brightness.
Step 203: judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
referring to fig. 4, a flowchart of the steps for determining scene contrast is shown. The step of judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value comprises the following substeps:
substep S2031: judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
substep S2032: if not, determining the scene contrast of the current frame image as a third contrast;
substep S2033: if yes, judging whether the backlight average value is larger than a preset average threshold value;
substep S2034: if so, determining the scene contrast of the current frame image as a second contrast;
substep S2035: if not, determining that the scene contrast of the current frame image is the first contrast.
Wherein the scene contrast includes a first contrast, a second contrast, and a third contrast, the first contrast being greater than the second contrast, the second contrast being greater than the third contrast,
in the embodiment of the invention, after N backlight values of N screen areas are determined, the backlight average value and the variance characteristic value of the current frame image are further obtained, and the scene contrast of the current frame image is judged according to the backlight average value and the variance characteristic value.
Judging the size between the variance characteristic value and a preset characteristic threshold, if the variance characteristic value is smaller than the preset characteristic threshold, determining that the scene contrast of the current frame image is a third contrast, wherein the variance characteristic value is a characteristic value representing the overall contrast of the image, and when the variance characteristic value is smaller than the preset characteristic threshold, the overall contrast of the image is not high, and the image belongs to a common image scene; under the condition that the variance characteristic value is larger than the predicted characteristic threshold value, further judging the relation between the backlight average value of the current frame image and the preset average threshold value, wherein when the backlight average value of the current frame image is larger than the preset average threshold value, the integral brightness of the current frame image is higher, and the scene contrast of the current frame image is determined to be a second contrast, which indicates that the integral brightness of the scene of the current frame image is high and has high contrast, for example, the current frame image is a sun which just rises from the horizon in the morning, and the image forms the scene with high integral brightness and high contrast; when the backlight average value of the current frame image is smaller than the preset average threshold value, it is indicated that the overall brightness of the current frame image is relatively low, the scene contrast of the current frame image is determined to be a first contrast, and it is indicated that the overall brightness of the scene of the current frame image is relatively low and has a high contrast.
Step 204: when the scene contrast of the current frame image is a first contrast, determining a compensation value as a backlight maximum value according to the backlight value of the corresponding screen area, or determining the value range of the compensation value as the range between the backlight value of the corresponding screen area and the backlight maximum value;
substep S2041: judging a preset compensation threshold interval to which the backlight value belongs;
substep S2042: when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, determining that the corresponding compensation value is the maximum backlight value;
substep S2043: and when the preset compensation threshold interval to which the backlight value belongs is a second compensation threshold interval, determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum backlight value.
When the scene contrast of the current frame image is the first contrast, the compensation values may be classified for compensation, for example, a preset compensation threshold interval to which the backlight value belongs may be determined;
when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation thresholdDuring interval, determining the corresponding compensation value as the maximum backlight value, and the compensation value as BLcom(i)＝BLmaxWherein BLcom(i) For compensation values of the corresponding screen area, BLmaxIs the backlight maximum; in order to obtain a darker picture effect. Therefore, the reduced brightness part does not need to be improved by the compensation value at this time, only a part of compensation as small as possible is needed, the dark part of the picture is ensured not to leak light, and the saturated distortion of the picture is prevented.
When the preset compensation threshold interval to which the backlight value belongs is a second compensation threshold interval, determining the value range of the compensation value between the backlight value of the corresponding screen area and the maximum backlight value, and further determining the compensation value asWherein BLcom(i) Is the compensation value of the ith screen area, BL (i) is the backlight value of the ith screen area, BLmax_NAt the maximum backlight value, the image brightness levels are many, and most of the reduced brightness portions need to be increased by the compensation values, and the high brightness portions need to be ensured to be unsaturated.
Step 205: when the scene contrast of the current frame image is a second contrast, determining a compensation value as a backlight maximum value;
when the scene contrast of the current frame image is judged to be the second contrast, the compensation value is determined to be the maximum backlight value, and the compensation value is BLcom(i)＝BLmaxWherein BLcom(i) For the compensation value of the corresponding screen area, BLmax is the maximum backlight value; because the whole brightness of the scene of the current frame image is high and has high contrast, and the high brightness part is required to be ensured to be not saturated, the whole backlight maximum value is used for compensation, and the situation of saturation distortion of the image is prevented.
Step 206: when the scene contrast of the current frame image is a third contrast, determining the value range of the compensation value as the range between the backlight value of the corresponding screen area and the maximum backlight value;
when the scene contrast of the current frame image is judged to be the third contrast, the value range of the compensation value is determined to beBetween the backlight value and the backlight maximum value of the respective screen area, further, the compensation value may be further determined according to the following formula:wherein BLcom(i) Is the compensation value of the ith screen area, BL (i) is the backlight value of the ith screen area, BLmax_NAt the maximum backlight value, the image brightness levels are many, most of the reduced brightness portions need to be improved by compensation values, and meanwhile, the high brightness portions are not saturated, and the image brightness is guaranteed.
Step 207: and adjusting the backlight brightness of the current screen area by adopting the backlight value, and adjusting the display of the image by adopting the compensation value.
The backlight value is output to a corresponding control circuit to carry out drive control on the light emitting diode; lightening a light emitting diode of a corresponding screen area, and adjusting the backlight brightness of the current screen area; and further, outputting the compensation value to a corresponding liquid crystal control circuit, compensating the next frame image point by point, and adjusting the display of the next frame image in a corresponding screen area.
In the embodiment of the invention, after the brightness characteristic value is adopted to judge the backlight value corresponding to the preset backlight threshold interval, the scene contrast of the whole image is further judged, and the scene contrast is divided into three layers: the first contrast, the second contrast and the third contrast can determine a backlight value and a compensation value according to the overall brightness and the contrast in the current frame image, can obtain a better light-tight picture effect, can prevent image saturation distortion, ensures the picture brightness, and improves the display picture permeability and detail level.
EXAMPLE III
In order to make the embodiment of the present invention better understood, the following description is made by taking a specific example of adjusting the backlight brightness using the backlight value and the compensation value.
Referring to fig. 5, there is shown an internal configuration diagram of an intelligent Display device including a backlight source group 1 disposed on one side or both sides of a Liquid Crystal panel (LCD), a Liquid Crystal panel 2 displaying a video image, a PWM circuit controlling light emission of a determined value of a backlight source, a circuit determining a backlight value and a compensation value, a video converter, a backlight compensation circuit, a Liquid Crystal control circuit, and connections of the respective circuits. In which the side backlight is divided into N individually controllable backlight groups that respectively control corresponding areas on the LCD, as shown by the N dashed lines 1,2, … …. The backlight value of each area is determined according to the algorithm, and meanwhile, the compensation value of the illuminated area is determined and used for compensation of a subsequent backlight compensation circuit, the compensation circuit performs compensation brightening of the image according to the compensation value, image darkening caused by backlight dimming is eliminated, and the image is displayed on the LCD in a high-dynamic mode.
Referring to fig. 6, a flowchart of adjusting backlight brightness according to an embodiment of the present invention is shown, and a specific processing flow is shown in fig. 5, where a brightness value of each pixel of a current frame image is calculated according to pixel values input point by point; respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel; further determining the backlight value of the area, sequentially performing spatial filtering and temporal filtering on the backlight value, eliminating the problems of backlight unevenness in space and backlight flicker in time, finally outputting the backlight value to a PWM control circuit, performing LED drive control, illuminating a backlight Light Emitting Diode (LED) unit, determining a compensation value according to the backlight value, outputting the compensation value to a backlight compensation signal circuit, judging whether the compensation signal is 1, if so, directly outputting image data to an LCD for image display, otherwise, inputting the compensation value to obtain the compensation signal, and then performing image compensation point by point and outputting the compensation signal to the LCD for display.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Example four
Referring to fig. 7, a block diagram of a fourth embodiment of a backlight adjustment apparatus for an intelligent display device according to the present invention is shown, where the intelligent display device has multiple screen areas, and may specifically include the following modules:
a brightness characteristic value obtaining module 301, configured to obtain a brightness characteristic value of each screen region when the current frame image is output in the multiple screen regions; wherein the brightness characteristic value is used for representing contrast;
a backlight value determining module 302, configured to determine a corresponding backlight value according to a preset backlight threshold interval to which a brightness feature value of a current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
a variance characteristic value determining module 303, configured to determine a variance characteristic value of the current frame image according to the backlight value of each screen region;
a compensation value determining module 304, configured to determine a corresponding compensation value according to the backlight value and the variance feature value;
the backlight brightness adjusting module 305 is configured to adjust the backlight brightness of the current screen area by using the backlight value, and adjust the display of the next frame of image by using the compensation value.
In a preferred embodiment of the present invention, the luminance characteristic value obtaining module includes:
the brightness value calculation module is used for calculating the brightness value of each pixel of the current frame image;
the maximum value and average value calculating module is used for respectively calculating the maximum value and the average value of the brightness of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining module is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
The preset backlight threshold interval comprises a first backlight threshold interval, a second backlight threshold interval, a third backlight threshold interval and a fourth backlight threshold interval, and the backlight value determining module comprises:
the first backlight value determining submodule is used for determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the first backlight threshold interval;
the second backlight value determining submodule is used for determining the brightness average value of the corresponding screen area as the backlight value when the preset backlight threshold value interval to which the brightness characteristic value belongs is the second backlight threshold value interval;
the third backlight value determining submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the third backlight threshold interval;
and the fourth backlight value determining submodule is used for determining the maximum brightness value of the corresponding screen area as the backlight value when the preset backlight threshold interval to which the brightness characteristic value belongs is the fourth backlight threshold interval.
The variance eigenvalue determination module comprises:
the backlight value acquisition submodule is used for acquiring backlight values of the plurality of screen areas;
the backlight average value and backlight maximum value calculation submodule is used for calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
and the variance characteristic value obtaining submodule is used for analyzing the backlight values and the backlight average value of the plurality of screen areas by adopting a variance formula to obtain the variance characteristic value of the current frame image.
In a preferred embodiment of the present invention, each frame of image has a scene contrast, where the scene contrast includes a first contrast, a second contrast and a third contrast, the first contrast is greater than the second contrast, and the second contrast is greater than the third contrast, and the compensation value determining module includes:
the scene contrast judging submodule is used for judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
a first compensation value determining sub-module, configured to determine, when the scene contrast of the current frame image is a first contrast, a compensation value as a maximum backlight value according to a backlight value of a corresponding screen region, or determine a value range of the compensation value as between the backlight value of the corresponding screen region and the maximum backlight value;
the second compensation value determining submodule is used for determining the compensation value as the backlight maximum value when the scene contrast of the current frame image is the second contrast;
and the third compensation value determining sub-module is used for determining the value range of the compensation value to be between the backlight value and the backlight maximum value of the corresponding screen area when the scene contrast of the current frame image is the third contrast.
The scene contrast judgment submodule includes:
the variance characteristic value judging unit is used for judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
a third contrast determining unit, configured to determine, if the current frame image is not the second scene image, that the scene contrast of the current frame image is the third contrast;
the backlight average value judging unit is used for judging whether the backlight average value is larger than a preset average threshold value or not if the backlight average value is larger than the preset average threshold value;
the second contrast determining unit is used for determining the scene contrast of the current frame image as the second contrast if the scene contrast of the current frame image is the second contrast;
and the first contrast determining unit is used for determining the scene contrast of the current frame image as the first contrast if the current frame image is not the first scene contrast.
In a preferred embodiment of the present invention, the first contrast determining unit includes:
and the backlight value judging subunit is used for judging the preset compensation threshold interval to which the backlight value belongs.
In a preferred embodiment of the present invention, the preset compensation threshold interval includes a first compensation threshold interval, a second compensation threshold interval, and a third compensation threshold interval, and then the first contrast determining unit further includes:
a fourth compensation value determining subunit, configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, that the corresponding compensation value is the maximum backlight value;
and the fifth compensation value determining subunit is configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the second compensation threshold interval, that the value range of the compensation value is between the backlight value of the corresponding screen area and the maximum backlight value.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The method and the apparatus provided by the present invention are described in detail, and the principle and the embodiment of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (14)

1. A backlight adjusting method of an intelligent display device, wherein the intelligent display device is provided with a plurality of screen areas, comprising:
acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
determining a variance characteristic value of the current frame image according to the backlight value of each screen area;
determining a corresponding compensation value according to the backlight value and the variance characteristic value;
adjusting the backlight brightness of the current screen area by adopting the backlight value, and adjusting the display of an image by adopting the compensation value;
wherein each frame of image has a scene contrast, the scene contrast includes a first contrast, a second contrast and a third contrast, the first contrast is greater than the second contrast, the second contrast is greater than the third contrast, and the step of determining the corresponding compensation value according to the backlight value and the variance eigenvalue includes:
judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
when the scene contrast of the current frame image is a first contrast, determining a compensation value as a backlight maximum value according to the backlight value of the corresponding screen area, or determining the value range of the compensation value as the range between the backlight value of the corresponding screen area and the backlight maximum value;
when the scene contrast of the current frame image is a second contrast, determining a compensation value as a backlight maximum value;
and when the scene contrast of the current frame image is a third contrast, determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum backlight value.
2. The method according to claim 1, wherein the step of obtaining the luminance characteristic value of each screen region when the current frame image is output in the plurality of screen regions comprises:
calculating the brightness value of each pixel of the current frame image;
respectively calculating the maximum brightness value and the average brightness value of the plurality of screen areas by adopting the brightness value of each pixel;
and performing difference operation on the maximum brightness values and the average brightness values of the plurality of screen areas respectively to obtain the brightness characteristic values of the plurality of screen areas.
3. The method according to claim 1 or 2, wherein the preset backlight threshold intervals include a first backlight threshold interval, a second backlight threshold interval, a third backlight threshold interval and a fourth backlight threshold interval, and the step of determining the corresponding backlight value according to the preset backlight threshold interval to which the brightness characteristic value of the current screen region belongs comprises:
when the preset backlight threshold interval to which the brightness characteristic value belongs is a first backlight threshold interval, determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area;
when the preset backlight threshold interval to which the brightness characteristic value belongs is a second backlight threshold interval, determining the brightness average value of the corresponding screen area as a backlight value;
when the preset backlight threshold interval to which the brightness characteristic value belongs is a third backlight threshold interval, determining the value range of the backlight value as the interval between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area;
and when the preset backlight threshold interval to which the brightness characteristic value belongs is a fourth backlight threshold interval, determining the maximum brightness value of the corresponding screen area as the backlight value.
4. The method of claim 1, wherein the step of determining the variance characteristic value of the current frame image according to the backlight value of each screen region comprises:
acquiring backlight values of the plurality of screen areas;
calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
and analyzing the backlight values of the plurality of screen areas and the backlight average value by adopting a variance formula to obtain a variance characteristic value of the current frame image.
5. The method of claim 1, wherein the step of determining the magnitude of the scene contrast of the current frame image according to the backlight average and the variance eigenvalue comprises:
judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
if not, determining the scene contrast of the current frame image as a third contrast;
if yes, judging whether the backlight average value is larger than a preset average threshold value;
if so, determining the scene contrast of the current frame image as a second contrast;
if not, determining that the scene contrast of the current frame image is the first contrast.
6. The method according to claim 1, wherein when the scene contrast of the current frame image is the first contrast, determining the compensation value as the maximum backlight value according to the backlight value of the corresponding screen region, or determining the range of the compensation value between the backlight value of the corresponding screen region and the maximum backlight value comprises:
and judging the preset compensation threshold value interval to which the backlight value belongs.
7. The method according to claim 1 or 6, wherein the preset compensation threshold interval includes a first compensation threshold interval, a second compensation threshold interval and a third compensation threshold interval, and the step of determining the compensation value as the backlight maximum value or determining the value range of the compensation value as the backlight maximum value of the corresponding screen region according to the backlight value when the scene contrast of the current frame image is the first contrast further includes:
when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, determining that the corresponding compensation value is the maximum backlight value;
and when the preset compensation threshold interval to which the backlight value belongs is a second compensation threshold interval, determining the value range of the compensation value to be between the backlight value of the corresponding screen area and the maximum backlight value.
8. A backlight adjustment apparatus for a smart display device, the smart display device having a plurality of screen areas, comprising:
the brightness characteristic value acquisition module is used for acquiring the brightness characteristic value of each screen area when the current frame image is output in the plurality of screen areas; wherein the brightness characteristic value is used for representing contrast;
the backlight value determining module is used for determining a corresponding backlight value according to a preset backlight threshold interval to which the brightness characteristic value of the current screen area belongs; wherein, different preset backlight threshold intervals correspond to different backlight values;
the variance characteristic value determining module is used for determining the variance characteristic value of the current frame image according to the backlight value of each screen area;
the compensation value determining module is used for determining a corresponding compensation value according to the backlight value and the variance characteristic value;
the backlight brightness adjusting module is used for adjusting the backlight brightness of the current screen area by adopting the backlight value and adjusting the display of the next frame of image by adopting the compensation value;
wherein each frame image has a scene contrast including a first contrast, a second contrast, and a third contrast, the first contrast being greater than the second contrast, the second contrast being greater than the third contrast, the compensation value determination module includes:
the scene contrast judging submodule is used for judging the scene contrast of the current frame image according to the backlight average value and the variance characteristic value;
a first compensation value determining sub-module, configured to determine, when the scene contrast of the current frame image is a first contrast, a compensation value as a maximum backlight value according to a backlight value of a corresponding screen region, or determine a value range of the compensation value as between the backlight value of the corresponding screen region and the maximum backlight value;
the second compensation value determining submodule is used for determining the compensation value as the backlight maximum value when the scene contrast of the current frame image is the second contrast;
and the third compensation value determining sub-module is used for determining the value range of the compensation value to be between the backlight value and the backlight maximum value of the corresponding screen area when the scene contrast of the current frame image is the third contrast.
9. The apparatus according to claim 8, wherein the luminance characteristic value obtaining module comprises:
the brightness value calculation module is used for calculating the brightness value of each pixel of the current frame image;
the maximum value and average value calculating module is used for respectively calculating the maximum value and the average value of the brightness of the plurality of screen areas by adopting the brightness value of each pixel;
and the brightness characteristic value obtaining module is used for respectively carrying out difference operation on the brightness maximum value and the brightness average value of the plurality of screen areas to obtain the brightness characteristic values of the plurality of screen areas.
10. The apparatus of claim 8 or 9, wherein the preset backlight threshold interval comprises a first backlight threshold interval, a second backlight threshold interval, a third backlight threshold interval and a fourth backlight threshold interval, and the backlight value determining module comprises:
the first backlight value determining submodule is used for determining that the value range of the backlight value is between 0 and the brightness average value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the first backlight threshold interval;
the second backlight value determining submodule is used for determining the brightness average value of the corresponding screen area as the backlight value when the preset backlight threshold value interval to which the brightness characteristic value belongs is the second backlight threshold value interval;
the third backlight value determining submodule is used for determining the value range of the backlight value to be between the brightness average value of the corresponding screen area and the brightness maximum value of the corresponding screen area when the preset backlight threshold interval to which the brightness characteristic value belongs is the third backlight threshold interval;
and the fourth backlight value determining submodule is used for determining the maximum brightness value of the corresponding screen area as the backlight value when the preset backlight threshold interval to which the brightness characteristic value belongs is the fourth backlight threshold interval.
11. The apparatus of claim 8, wherein the variance eigenvalue determination module comprises:
the backlight value acquisition submodule is used for acquiring backlight values of the plurality of screen areas;
the backlight average value and backlight maximum value calculation submodule is used for calculating the backlight average value and the backlight maximum value of the current frame image by adopting the backlight values of the plurality of screen areas;
and the variance characteristic value obtaining submodule is used for analyzing the backlight values and the backlight average value of the plurality of screen areas by adopting a variance formula to obtain the variance characteristic value of the current frame image.
12. The apparatus of claim 8, wherein the scene contrast determination sub-module comprises:
the variance characteristic value judging unit is used for judging whether the variance characteristic value is larger than a preset characteristic threshold value or not;
a third contrast determining unit, configured to determine, if the current frame image is not the second scene image, that the scene contrast of the current frame image is the third contrast;
the backlight average value judging unit is used for judging whether the backlight average value is larger than a preset average threshold value or not if the backlight average value is larger than the preset average threshold value;
the second contrast determining unit is used for determining the scene contrast of the current frame image as the second contrast if the scene contrast of the current frame image is the second contrast;
and the first contrast determining unit is used for determining the scene contrast of the current frame image as the first contrast if the current frame image is not the first scene contrast.
13. The apparatus according to claim 8, wherein the first contrast determination unit includes:
and the backlight value judging subunit is used for judging the preset compensation threshold interval to which the backlight value belongs.
14. The apparatus according to claim 8 or 13, wherein the preset compensation threshold interval comprises a first compensation threshold interval, a second compensation threshold interval, and a third compensation threshold interval, and the first contrast determination unit further comprises:
a fourth compensation value determining subunit, configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the first compensation threshold interval or the third compensation threshold interval, that the corresponding compensation value is the maximum backlight value;
and the fifth compensation value determining subunit is configured to determine, when the preset compensation threshold interval to which the backlight value belongs is the second compensation threshold interval, that the value range of the compensation value is between the backlight value of the corresponding screen area and the maximum backlight value.
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