CN108257580A - A kind of adjusting method and device of the display picture based on backlight illumination - Google Patents
A kind of adjusting method and device of the display picture based on backlight illumination Download PDFInfo
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- CN108257580A CN108257580A CN201611234280.8A CN201611234280A CN108257580A CN 108257580 A CN108257580 A CN 108257580A CN 201611234280 A CN201611234280 A CN 201611234280A CN 108257580 A CN108257580 A CN 108257580A
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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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
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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
- G09G3/3413—Details of control of colour illumination sources
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Abstract
The invention discloses a kind of adjusting methods of the display picture based on backlight illumination, pass through histogram area integral method, extract the pixel characteristic value that current screen shows picture, and the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched in the look-up table loaded, current screen is shown that picture is adjusted to the backlight value.It is area pellucida and dark space by the histogram icon of acquired gray value probability, the Bezier of area pellucida, dark space and image gain coefficient generation continuously smooth according to label, and the Bezier according to continuously smooth is respectively adjusted the gray value of each pixel in area pellucida and dark space.In this way, backlight illumination is not only reduced, so as to reduce power consumption, and in the case where backlight illumination is relatively low, enhance that image is bright, contrast of dark space, improve image visual effect, it also avoids simultaneously and the oversaturated problem of pixel occurs, largely avoid the loss of image detail.
Description
Technical field
The present invention relates to electronic device field more particularly to it is a kind of based on backlight illumination display picture adjusting method and
Device.
Background technology
Screen in some electronic equipments light and the display of picture, be by being mounted on the backlight after screen back
It shines and is formed, can be herein backlight by the light representations that backlight is sent out.Such as：Mobile phone screen, notebook-type computer screen
Curtain and some TV display screen curtains.The backlight very power consumption during electronic equipment use, because in order to save electric energy,
It needs to weaken backlight.
The decrease of backlight, the display picture that may cause screen is dimmed, so as to cause bad visual effect to user.For
In the case where backlight is weaker, can also clearer display image information, need to showing that the brightness of picture is adjusted,
In the prior art, when the brightness of on-screen displays being adjusted, the single strategy of generally use is to entire screen gray value
It is adjusted, although can achieve the purpose that brightness of image is adjusted, it is possible that causing the gray value supersaturation of display picture
Problem, so as to cause the loss of details.
Invention content
In view of this, the embodiment of the invention discloses a kind of adjusting methods and dress of the display picture based on backlight illumination
It puts, not only has adjusted backlight illumination, reduce power consumption, and in the case where backlight illumination is relatively low, improve the vision of image
Effect, while the loss in detail of image will not be caused.
A kind of adjusting method of display picture based on backlight illumination disclosed by the embodiments of the present invention, the method can wrap
It includes：
According to histogram area integral method, extraction current screen shows the pixel characteristic value of picture；
In the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched；
According to the backlight value, the backlight illumination that the current screen shows picture is adjusted；
It is area pellucida and dark space by the histogram icon of acquired gray value probability；The histogram of the gray value probability is
It is obtained according to the probability that each gray value of collected display picture and each gray value occur in the display picture
It arrives；
According to area pellucida dark space, image gain coefficient and default rule, the digital Bezier of continuously smooth is generated,
And the corresponding gain lookup of digital Bezier of generation and the continuously smooth；
According to the gain lookup, each gray value of the area pellucida and dark space is adjusted, to enhance area pellucida and dark
The contrast in area.
Optionally, described according to histogram area integral method, extraction shows the pixel characteristic value of picture；
Show that the gray value of each pixel of picture is sampled to the current screen according to the preset method of sampling；
The histogram of the gray value probability is calculated according to sampled result；
The side low from gray value traverses the histogram, the gray scale traversed using the method calculating of definite integral
It is worth the area of corresponding histogram regions；
Judge whether the area is more than preset area threshold；
If more than preset area threshold, using gray value at this time as pixel characteristic value.
Optionally, by the histogram icon of acquired gray value probability be area pellucida and dark space, including：
The average value of the corresponding each gray value of the histogram is obtained, using obtained average value as segmentation threshold；
Judge whether each gray value of the histogram is more than the preset segmentation threshold；
The zone marker that will be greater than the gray value composition of the point threshold is area pellucida；
It is dark space by the zone marker formed no more than the gray value of the segmentation threshold.
Optionally, according to area pellucida dark space, image gain coefficient and default rule, the digital shellfish plug of continuously smooth is generated
That curve, including：
According to the area pellucida, dark space and described image gain coefficient, multiple controls of the digital Bezier are calculated
Point；
According to the multiple control point, corresponding digital Bezier is obtained；
Linear interpolation is carried out to the digital Bezier, to obtain the digital Bezier of continuously smooth.
Optionally, it according to histogram area integral method, before extraction shows the pixel characteristic value of picture, further includes：
Load the look-up table.
The invention also discloses a kind of regulating device of the display picture based on backlight illumination, described device can include：
Extraction unit, for according to histogram area integral method, extraction current screen to show the pixel characteristic value of picture；
Searching unit, in the look-up table loaded, searching the corresponding backlight value of the pixel characteristic value and figure
As gain coefficient；
The first adjustment unit, for according to the backlight value, adjusting the backlight illumination that the current screen shows picture；
Indexing unit, for being area pellucida and dark space by the histogram icon of acquired gray value probability；The gray value
The histogram of probability is in the display picture according to each gray value of collected display picture and each gray value
What the probability of middle appearance obtained；
Generation unit, for according to area pellucida dark space, image gain coefficient and default rule, generating the number of continuously smooth
Word Bezier, and generate the corresponding gain lookup of digital Bezier with the continuously smooth；
Second adjustment unit, for according to the gain lookup, being adjusted to the pixel in the area pellucida and dark space,
To enhance the contrast in area pellucida and dark space.
Optionally, the extraction unit includes：
Subelement is sampled, for showing the gray scale of each pixel of picture to the current screen according to the preset method of sampling
Value is sampled；
First computation subunit, for calculating the histogram of the gray value probability according to sampled result；
Second computation subunit, for being traversed from the low side of gray value to the histogram, using definite integral
The area of the corresponding histogram regions of gray value that method calculating traverses；
First judgment sub-unit, for judging whether the area is more than preset area threshold；
Determination subelement, for if more than preset area threshold, using gray value at this time as pixel characteristic value.
Optionally, the indexing unit includes：
First obtains subelement, for obtaining the average value of the corresponding each gray value of the histogram, is averaged what is obtained
Value is as segmentation threshold；
Second judgment sub-unit, for judging whether each gray value of the histogram is more than the preset segmentation threshold
Value；
First label subelement, the zone marker for will be greater than the gray value of point threshold composition are area pellucida；
Second label subelement, the zone marker for that will be not more than the gray value of segmentation threshold composition are dark space.
Optionally, the generation unit includes：
Third computation subunit, for according to the area pellucida, dark space and described image gain coefficient, calculating the digital shellfish
Multiple control points of Sai Er curves；
Second obtains subelement, for according to the multiple control point, obtaining corresponding digital Bezier；
Subelement is obtained, for carrying out linear interpolation to the digital Bezier, to obtain the number of continuously smooth
Bezier.
Optionally, it further includes：
Subelement is loaded, for loading the look-up table.
The embodiment of the present invention, by histogram area integral method, extraction current screen shows the pixel characteristic value of picture, and
In the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched, current screen is shown
Show that picture is adjusted to the backlight value.It is area pellucida and dark space by the histogram icon of acquired gray value probability, according to label
Area pellucida, dark space and image gain coefficient generation continuously smooth Bezier, and according to the Bezier of continuously smooth
The gray value of each pixel in area pellucida and dark space is adjusted respectively.In this way, not only reducing backlight illumination, power consumption is reduced, and
And in the case where backlight illumination is relatively low, enhance that image is bright, contrast of dark space, improve image visual effect, simultaneously also
It avoids and the oversaturated problem of pixel occurs, largely avoid the loss of image detail.
Description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of flow signal of the adjusting method of display picture based on backlight illumination provided in an embodiment of the present invention
Figure；
Fig. 2 is a kind of flow signal of the adjusting method of display picture based on backlight illumination provided in an embodiment of the present invention
Figure；
Fig. 3 is a kind of flow signal of the adjusting method of display picture based on backlight illumination provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of structural representation of the regulating device of display picture based on backlight illumination provided in an embodiment of the present invention
Figure.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment shall fall within the protection scope of the present invention.
With reference to figure 1, a kind of flow of the adjusting method of the display picture based on backlight illumination of the embodiment of the present invention is shown
Schematic diagram.In the present embodiment, the method may include：
S101：According to histogram area integral method, extraction current screen shows the pixel characteristic value of picture.
In the present embodiment, with reference to figure 2, S101 can specifically include：
S201：Show that the gray value of each pixel of picture is adopted to the current screen according to the preset method of sampling
Sample.
It is aobvious due to forming when showing that the gray value of each pixel of picture samples to the current screen in the present embodiment
Show that there are many pixel of picture, and there are the pixel that gray value repeats, in order to reduce redundancy during sampling and raising is adopted
The efficiency of sample can be spaced several pixels and the gray value of the pixel in display picture is sampled.
In the present embodiment, the method for obtaining each grey scale pixel value is included a variety of, not limited in the present embodiment,
Such as can show that each color channel weights acquisition by default rule in picture to current screen；Can also be according to gray scale
It is worth method of weighting to obtain；Can also be obtained using brightness weight computation method.
S202：The histogram of the gray value probability is calculated according to sampled result.
In the present embodiment, the histogram of gray value probability is calculated according to sampled result, it is understood that be：The histogram
Abscissa can be expressed as the gray value of collected pixel, and ordinate can be expressed as each gray value in picture is shown
The probability of appearance.
S203：The side low from gray value traverses the histogram, is traversed using the method calculating of definite integral
The corresponding histogram regions of gray value area.
It illustrates：Assuming that the corresponding gray value region of histogram be [0,255], then can since 0 to histogram into
Row traversal, it is assumed that the intensity value ranges currently traversed be [0,100], then may be used definite integral method calculate from [0,
100] area of corresponding histogram regions, the area of each small block diagram in the corresponding histogram of pixel that will be traversed
It adds up.
S204：Judge whether the area is more than preset area threshold.
In the present embodiment, the preset area threshold can be the area threshold that technical staff is rule of thumb set
Value or the area threshold obtained by experiment, but the preset face either obtained by which kind of method
Product threshold value, the preset area threshold have been set before S204 is performed.
In the present embodiment, it should be noted that judge the corresponding histogram regions of the gray value traversed area whether
More than preset area threshold, the area of the corresponding histogram regions of gray value for judging to traverse can essentially be interpreted as
Whether accounting is more than preset area threshold, because the area of histogram whole region is 1, the gray value traversed is corresponding straight
The area of square graph region histogram regions corresponding with the gray value traversed are equal.
It illustrates：The balance that aims at of the area threshold is set to show that picture area pellucida and dark space calculate characteristic value
Influence, area threshold is higher, shows that the contribution that bright pixels calculate pixel characteristic value in image is bigger；And area is smaller,
Show that bright pixels are smaller to the contribution of pixel characteristic value in image；If area threshold is 50%, show that pixel characteristic value is
Area pellucida and the mean value of dark space pixel gray value；If wish the pixel characteristic value with high luminance pixels coupling in display picture more
By force, i.e. pixel characteristic value is closer to the pixel value of light in image, then can be turned up the area threshold, such as can be with
It is turned up to 70% or 80%.
S205：If more than preset area threshold, using gray value at this time as pixel characteristic value.
In the present embodiment, if the area of the corresponding histogram of the gray value traversed is more than preset area threshold, by this
When gray value as pixel characteristic value.
But it if the area of the corresponding histogram of gray value traversed is not more than preset area threshold, returns
S203 is performed, that is, traverses next gray value, calculates all areas of the corresponding histogram of gray value traversed.
In the present embodiment, pixel characteristic value is obtained using S201-S205, can effectively characterize the spy of image highlight area
Sign, is more in line with the visual sense feeling of the mankind, enhances the robustness for large area low gray level areas in image.
S102：In the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image enhancement system are searched
Number.
In the present embodiment, it can also include before S101：Load the look-up table.
In the present embodiment, the look-up table can be the correspondence table of backlight value, image enhancement coefficient and pixel characteristic value, i.e.,
Each pixel characteristic value can correspond to a backlight value and an image enhancement coefficient in table.
It in addition to this,, only need to be according to display picture present frame without storing history frame data using the method for the present embodiment
Data can obtain pixel characteristic value, and look-up table has been loaded with before S101, therefore improve the efficiency of operation.
S103：It is area pellucida and dark space by the histogram icon of acquired gray value probability；The gray value probability it is straight
Side's figure is to be occurred in the display picture according to each gray value of collected display picture and each gray value
What probability obtained.
It, can be according to the difference of the display each pixel gray value of screen, by display picture labeled as bright in the present embodiment
Area and dark space, with reference to figure 3, specific S103 can include：
S301：The average value of the corresponding each gray value of the histogram is obtained, using obtained average value as segmentation threshold.
In the present embodiment, the corresponding each gray value of the histogram is the ash obtained in S201 to display picture samples
Angle value.
S302：Judge whether each gray value of the histogram is more than the preset segmentation threshold.
S303：The zone marker that will be greater than the gray value composition of the segmentation threshold is area pellucida.
S304：It is dark space by the zone marker formed no more than the gray value of the segmentation threshold.
S105：According to area pellucida, dark space image gain coefficient and default rule, the Bezier for generating continuously smooth is bent
Line, and generate the corresponding gain lookup of Bezier with the continuously smooth.
In the present embodiment, S105 can specifically include：
S305：According to the area pellucida, dark space and described image gain coefficient, the multiple of the digital Bezier are calculated
Control point.
It illustrates：Assuming that the control point of the Bezier calculated for 5, can include respectively first kind control point and
Second class control point, wherein first kind control point may include three points, and the second class control point can include two points.Wherein,
The area pellucida and dark space the second class control point that a kind of control point is used for distinguishing in histogram are used for determining the gain of image light and shade variation
Intensity and direction, the process of calculating can include：
Wherein, first kind control point is calculated：The wherein first point starting point for dark space；Second point is the boundary in light and shade area
Point, this is along the dark amplitude of the bias effect picture blast of x-axis or drop and direction；It is thirdly the terminating point in area pellucida.
Specifically, first point of coordinate can be (0,0)；Coordinate thirdly can be (255,255)；If second point
It is deviated to negative direction of the x-axis, brightness while picture contrast increase is finally made to get a promotion；If second point is inclined to positive direction of the x-axis
It moves, while finally making picture contrast increase, overall brightness reduces.Therefore particularly important, this reality is chosen in the position of second point
It applies in example on the basis of histogram mean value k, is deviated according to gain coefficient a to corresponding direction, it is final to obtain second point position.
Assuming that the coordinate of second point is：(xc,yc)；
Wherein,(k is mean value, and α is gain coefficient)；
F (k, α)=k (1- α θ), θ ∈ [0,1] are limiting figure.
Calculate the second class control point：
The 4th point is dark space control point in the present embodiment, which deviates considerably from the straight line where first kind control point,
And deviated to negative direction of the y-axis, finally so that dark picture areas overall brightness enhances the region contrast while decline.
4th point of coordinate can be：(xL,yL)
Wherein,(α be gain coefficient, α ∈ [0,1])；
g(α,xL)=xL(1+ η (α -1)), η ∈ [0,1] are limiting figure；
The 5th point is area pellucida control point in the present embodiment, which deviates considerably from straight line where first kind control point, and
It is deviated to positive direction of the y-axis, finally so that image area pellucida overall brightness enhances the region contrast while promotion.
5th point of coordinate can be：(xR,yR)；
Wherein,yR=h (a, xR)；
h(α,xR)=xR+αδ(255-xR), δ ∈ [0,1] are limiting figure.
S306：According to the multiple control points obtained, corresponding digital Bezier is obtained.
S307：Linear interpolation is carried out to digital Bezier, to obtain the digital Bezier of continuously smooth.
In the present embodiment, digital Bezier is made of discrete isolated point, and the digital shellfish is formed in S306
The point of Sai Er curves may be than sparse, if wanting to obtain the Bezier of continuously smooth i.e. dense Bezier song
Bezier can be carried out linear difference by line, you can be interpreted as being inserted into several points among the point of various discrete, be made
Continuous sampled value can be obtained at each sampled point by obtaining the digital Bezier, so as to obtain the Bezier of continuously smooth
Curve.
S106：According to the gain lookup, each gray value of the area pellucida and dark space is adjusted, to enhance area pellucida
With the contrast of dark space.
In the present embodiment, the present embodiment is adjusted the gray value in the area pellucida and dark space according to the gain lookup
When, it can be to the carry out pixel transform in histogram pixel-by-pixel, i.e., each gray value of area pellucida and dark space be become one by one
It changes.Since digital Bezier is continuously smooth, and gain lookup and the digital Bezier of the continuously smooth
It is corresponding, therefore when the gray value to area pellucida and dark space is adjusted, for the gray value closer to area pellucida boundary
The amplitude meeting very little for increasing or reducing with the gray value of dark space boundary, and the gray value among area pellucida and dark space is increased
Or the amplitude reduced can be relatively large, and the curve smoothing at area pellucida and dark space separation, therefore to area pellucida and dark space
After gray value is adjusted, bright, dark space transitions smooth.The problem of not only avoiding the occurrence of pixel saturation in this way, but also can be with
Improve the contrast for showing picture.
Specifically, when light and shade area is adjusted, the continuously smooth according to obtained from above by above two classes control point
Bezier curve, at first kind control point, i.e., first point, second point and thirdly locate, image adjustment amplitude is close to 0；
First point, thirdly locate, effectively prevent pixel saturated phenomenon.At second point, i.e., at light and shade area separation, curve connects
It is continuous, smooth.And near the second class control point, image adjustment amplitude is larger, expands dynamic range to bright, dark two-stage respectively, increases
Strong image contrast so that picture distinctness is easily seen.
The embodiment of the present invention, by histogram area integral method, extraction current screen shows the pixel characteristic value of picture, and
In the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched, current screen is shown
Show that picture is adjusted to the backlight value.It is area pellucida and dark space by the histogram icon of acquired gray value probability, according to label
Area pellucida, dark space and image gain coefficient generation continuously smooth Bezier, and according to the Bezier of continuously smooth
The gray value of each pixel in area pellucida and dark space is adjusted respectively.In this way, not only reducing backlight illumination, power consumption is reduced, and
And in the case where backlight illumination is relatively low, enhance that image is bright, contrast of dark space, improve image visual effect, simultaneously also
It avoids and the oversaturated problem of pixel occurs, largely avoid the loss of image detail.
With reference to figure 4, a kind of structure of the regulating device of the display picture based on backlight illumination of the embodiment of the present invention is shown
Schematic diagram.In the present embodiment, described device can include：
Extraction unit 401, for according to histogram area integral method, extraction current screen to show the pixel characteristic of picture
Value；
Searching unit 402, in the look-up table loaded, search the corresponding backlight value of pixel characteristic value and
Image gain coefficient；
The first adjustment unit 403, for according to the backlight value, adjusting the current screen and showing that the backlight of picture is bright
Degree；
Indexing unit 404, for being area pellucida and dark space by the histogram icon of acquired gray value probability；The gray scale
The histogram for being worth probability is in the display picture according to each gray value of collected display picture and each gray value
What the probability occurred in face obtained；
Generation unit 405, for according to area pellucida dark space, image gain coefficient and default rule, generating continuously smooth
Bezier, and generate and the corresponding gain lookup of digital Bezier of the continuously smooth；
Second adjustment unit 406, for according to the gain lookup, being carried out to each gray value in the area pellucida and dark space
Adjustment, to enhance the contrast in area pellucida and dark space.
Optionally, the extraction unit includes：
Subelement is sampled, for showing the gray scale of each pixel of picture to the current screen according to the preset method of sampling
Value is sampled；
First computation subunit, for calculating the histogram of the gray value probability according to sampled result；
Second computation subunit, for being traversed from the low side of gray value to the histogram, using definite integral
The area of the corresponding histogram regions of gray value that method calculating traverses；
First judgment sub-unit, for judging whether the area is more than preset area threshold；
Determination subelement, for if more than preset area threshold, using gray value at this time as pixel characteristic value.
Optionally, the indexing unit includes：
First obtain subelement, for obtaining the average value of each gray value of the histogram, using obtained average value as
Segmentation threshold；
Second judgment sub-unit, for judging whether each gray value of the histogram is more than the preset segmentation threshold
Value；
First label subelement, the zone marker for will be greater than the gray value of point threshold composition are area pellucida；
Second label subelement, the zone marker for that will be not more than the gray value of segmentation threshold composition are dark space.
Optionally, the generation unit includes：
Third computation subunit, for according to the area pellucida, dark space and described image gain coefficient, calculating the digital shellfish
Multiple control points of Sai Er curves；
Second obtains subelement, for according to the multiple control point, obtaining corresponding digital Bezier；
Subelement is obtained, for carrying out linear interpolation to the digital Bezier, to obtain the Bei Sai of continuously smooth
That curve.
Optionally, it further includes：
Subelement is loaded, for loading the look-up table.
The device provided through this embodiment, by histogram area integral method, extraction current screen shows the picture of picture
Plain characteristic value, and in the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched, it will
Current screen shows that picture is adjusted to the backlight value.By the histogram icon of acquired gray value probability for area pellucida and secretly
Area, the Bezier of area pellucida, dark space and image gain coefficient the generation continuously smooth according to label, and according to continuously smooth
Bezier is respectively adjusted the gray value of each pixel in area pellucida and dark space.In this way, not only reducing backlight illumination, reduce
Power consumption, and in the case where backlight illumination is relatively low, enhances that image is bright, contrast of dark space, improves image vision effect
Fruit, while also avoid and the oversaturated problem of pixel occur, largely avoid the loss of image detail.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference from other examples, and just to refer each other for identical similar part between each embodiment.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (10)
1. a kind of adjusting method of the display picture based on backlight illumination, which is characterized in that the method includes：
According to histogram area integral method, extraction current screen shows the pixel characteristic value of picture；
In the look-up table loaded, the corresponding backlight value of the pixel characteristic value and image gain coefficient are searched；
According to the backlight value, the backlight illumination that the current screen shows picture is adjusted；
It is area pellucida and dark space by the histogram icon of acquired gray value probability；According to the histogram of the gray value probability
What the probability that each gray value of collected display picture and each gray value have occurred in the display picture obtained；
According to area pellucida dark space, image gain coefficient and default rule, the digital Bezier of continuously smooth is generated, and raw
Into the corresponding gain lookup of digital Bezier with the continuously smooth；
According to the gain lookup, each gray value of the area pellucida and dark space is adjusted, to enhance area pellucida and dark space
Contrast.
2. according to the method described in claim 1, it is characterized in that, described according to histogram area integral method, extraction shows picture
The pixel characteristic value in face；
Show that the gray value of each pixel of picture is sampled to the current screen according to the preset method of sampling；
The histogram of the gray value probability is calculated according to sampled result；
The side low from gray value traverses the histogram, the gray value pair traversed using the method calculating of definite integral
The area for the histogram regions answered；
Judge whether the area is more than preset area threshold；
If more than preset area threshold, using gray value at this time as pixel characteristic value.
3. according to the method described in claim 2, it is characterized in that, it is bright by the histogram icon of acquired gray value probability
Area and dark space, including：
The average value of each gray value of the histogram is obtained, using obtained average value as segmentation threshold；
Judge whether each gray value of the histogram is more than the preset segmentation threshold；
The zone marker that will be greater than the gray value composition of the point threshold is area pellucida；
It is dark space by the zone marker formed no more than the gray value of the segmentation threshold.
4. according to the method described in claim 2, it is characterized in that, according to area pellucida dark space, image gain coefficient and preset
Rule generates the digital Bezier of continuously smooth, including：
According to the area pellucida, dark space and described image gain coefficient, multiple control points of the digital Bezier are calculated；
According to the multiple control point, corresponding digital Bezier is obtained；
Linear interpolation is carried out to the digital Bezier, to obtain the digital Bezier of continuously smooth.
5. according to the method described in claim 1, it is characterized in that, according to histogram area integral method, extraction shows picture
Before pixel characteristic value, further include：
Load the look-up table.
6. a kind of regulating device of the display picture based on backlight illumination, which is characterized in that described device includes：
Extraction unit, for according to histogram area integral method, extraction current screen to show the pixel characteristic value of picture；
Searching unit increases in the look-up table loaded, searching the corresponding backlight value of the pixel characteristic value and image
Beneficial coefficient；
The first adjustment unit, for according to the backlight value, adjusting the backlight illumination that the current screen shows picture；
Indexing unit, for being area pellucida and dark space by the histogram icon of acquired gray value probability；The gray value probability
Histogram be according to it is collected display picture each gray value and each gray value it is described display picture in go out
What existing probability obtained；
Generation unit, for according to area pellucida dark space, image gain coefficient and default rule, generating the digital shellfish of continuously smooth
Sai Er curves, and generate the corresponding gain lookup of digital Bezier with the continuously smooth；
Second adjustment unit, for according to the gain lookup, being adjusted to each gray value of the area pellucida and dark space, with
Enhance the contrast of area pellucida and dark space.
7. device according to claim 6, which is characterized in that the extraction unit includes：
Sample subelement, for according to the preset method of sampling to the current screen show picture each pixel gray value into
Row sampling；
First computation subunit, for calculating the histogram of the gray value probability according to sampled result；
Second computation subunit, for being traversed from the low side of gray value to the histogram, using the method for definite integral
Calculate the area of the corresponding histogram regions of gray value traversed；
First judgment sub-unit, for judging whether the area is more than preset area threshold；
Determination subelement, for if more than preset area threshold, using gray value at this time as pixel characteristic value.
8. device according to claim 7, which is characterized in that the indexing unit includes：
First obtain subelement, for obtaining the average value of each gray value of the histogram, using obtained average value as divide
Cut threshold value；
Second judgment sub-unit, for judging whether each gray value of the histogram is more than the preset segmentation threshold；
First label subelement, the zone marker for will be greater than the gray value of point threshold composition are area pellucida；
Second label subelement, the zone marker for that will be not more than the gray value of segmentation threshold composition are dark space.
9. device according to claim 7, which is characterized in that the generation unit includes：
Third computation subunit, for according to the area pellucida, dark space and described image gain coefficient, calculating the digital Bezier
Multiple control points of curve；
Second obtains subelement, for according to the multiple control point, obtaining corresponding digital Bezier；
Subelement is obtained, for carrying out linear interpolation to the digital Bezier, to obtain the digital shellfish plug of continuously smooth
That curve.
10. device according to claim 6, which is characterized in that further include：
Subelement is loaded, for loading the look-up table.
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