CN111698442B - Image contrast adjusting method, display device and storage medium - Google Patents
Image contrast adjusting method, display device and storage medium Download PDFInfo
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Abstract
The invention discloses an image contrast adjusting method, a display device and a storage medium, wherein the method comprises the following steps: acquiring a contrast increasing value of the image, and determining an original contrast adjusting curve according to the contrast increasing value; acquiring a correction angle, and determining a correction curve according to the correction angle; correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve; adjusting the image contrast according to the target contrast adjustment curve; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve. The original contrast adjustment curve and the correction curve are determined according to the contrast increase value, then the correction curve with the slope smaller than that of the original contrast adjustment curve is used for correcting the original contrast adjustment curve, the corrected original contrast adjustment curve is used for adjusting the image contrast, the brightness of the high gray scale part of the image is reduced, the image contrast is improved, and meanwhile the phenomenon of image high gray scale whitening is eliminated.
Description
Technical Field
The present invention relates to the field of image processing technologies, and in particular, to an image contrast adjustment method, a display device, and a storage medium.
Background
The image digital processing technology is a technology for digitizing an image and performing various kinds of processing. Various techniques for image quality processing, such as saturation adjustment, noise reduction, contrast adjustment, edge enhancement, and the like, can greatly improve and enhance image quality.
The essence of contrast adjustment is to expand (or compress) the original value range of the image pixel points to another value range, thereby enhancing (or reducing) the pixel point difference and finally achieving the purpose that human eyes can clearly distinguish the image difference. The existing contrast adjusting method is to improve the brightness slope of the picture, and the method can generate a high gray scale reverse white phenomenon while improving the picture brightness.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention is directed to an image contrast adjusting method, a display device and a storage medium, which are provided to solve the above-mentioned drawbacks of the prior art, and aims to solve the problem that the method for improving image contrast by improving the brightness slope of a screen in the prior art may cause a high gray-scale reverse white phenomenon.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an image contrast adjusting method, comprising the steps of:
obtaining a contrast increasing value of an image, and determining an original contrast adjusting curve according to the contrast increasing value;
acquiring a correction angle, and determining a correction curve according to the correction angle; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve;
correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve;
and adjusting the image contrast according to the target contrast adjusting curve.
The image contrast adjusting method is characterized in that an equation corresponding to the original contrast adjusting curve is as follows:
Y add ＝256/(256-A)*X add
wherein, Y add For the output gray scale, X, corresponding to the original contrast adjustment curve add A is the contrast increment value for the input gray scale corresponding to the original contrast adjustment curve.
The image contrast adjusting method is characterized in that the equation corresponding to the correction curve is as follows:
Y clip ＝256-[(256-X gray )*tanΘ]
wherein, Y clip For correcting the output gray scale corresponding to the curve, X gray To correct the input gray level corresponding to the curve, Θ is the correction angle, which is determined or preset by the contrast increment value.
The image contrast adjusting method, wherein the step of correcting the original contrast adjusting curve according to the correction curve to obtain a target contrast adjusting curve specifically includes:
acquiring an intersection point of the correction curve and the original contrast curve;
replacing the output gray scale corresponding to the original contrast curve from the intersection point to the high-order highest point with the output gray scale corresponding to the correction curve to obtain a target contrast adjustment curve; and the high-order highest point is a point corresponding to the maximum input gray scale of the original contrast curve.
The image contrast adjusting method is characterized in that the correction angle is set according to user requirements or determined according to the corresponding relation between the correction angle and the contrast increasing value.
In the method for adjusting image contrast, when the correction angle is determined according to the corresponding relationship between the correction angle and the contrast increase value, the step of obtaining the correction angle specifically includes:
determining the corresponding relation between the correction angle and a preset angle threshold according to the corresponding relation between the contrast increasing value and a preset contrast threshold;
and acquiring the correction angle according to the corresponding relation between the correction angle and the preset angle threshold.
The image contrast adjusting method is characterized in that the preset angle threshold is in a range of 0-45 degrees.
The image contrast adjusting method described above, wherein the step of replacing the output gray scale corresponding to the original contrast curve from the intersection point to the high-order highest point with the output gray scale corresponding to the correction curve, and obtaining the target contrast adjusting curve further includes:
and smoothing the intersection points.
A display device, comprising: a processor, a storage medium communicatively coupled to the processor, the storage medium adapted to store a plurality of instructions; the processor is adapted to invoke instructions in the storage medium to perform the steps of implementing the image contrast adjustment method.
A storage medium having stored thereon a plurality of instructions adapted to be loaded and executed by a processor to perform the steps of implementing the image contrast adjustment method.
The invention has the beneficial effects that: the method determines an original contrast adjustment curve according to the contrast increase value, then corrects the original contrast adjustment curve by using a correction curve with a slope smaller than that of the original contrast adjustment curve, adjusts the image contrast by using the corrected original contrast adjustment curve, reduces the brightness of a high gray scale part of an image, improves the image contrast and eliminates the phenomenon of high gray scale whitening of the image.
Drawings
FIG. 1 is a flowchart of a preferred embodiment of an image contrast adjustment method according to an embodiment of the present invention;
FIG. 2 is a diagram of an original contrast adjustment curve, a correction curve, and a standard contrast adjustment curve corresponding to input and output gray levels of 0-255;
FIG. 3 is a schematic diagram of a target contrast adjustment curve obtained after the original contrast adjustment curve is corrected by the correction curve in FIG. 2;
fig. 4 is a functional schematic diagram of a display device provided in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The image contrast adjusting method provided by the invention can be applied to a terminal. The terminal may be, but is not limited to, a television, various personal computers, a notebook computer, a mobile phone, a tablet computer, a vehicle-mounted computer, and a portable wearable device. The terminal of the invention adopts a multi-core processor. The processor of the terminal may be at least one of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Video Processing Unit (VPU), and the like.
The invention provides an image contrast adjusting method, aiming at solving the problem that the image contrast is improved by improving the brightness slope of a picture in the prior art, and the method can cause a high gray scale reverse white phenomenon while improving the picture brightness.
Referring to fig. 1, fig. 1 is a flowchart illustrating an image contrast adjusting method according to a preferred embodiment of the present invention.
In a preferred embodiment of the present invention, the image contrast adjusting method is applied to a television, and the image contrast adjusting method includes the steps of:
s100, obtaining a contrast increasing value of the image, and determining an original contrast adjusting curve according to the contrast increasing value.
When the contrast of the image needs to be adjusted by a user, inputting a contrast increasing value in the contrast adjusting option or selecting one of a plurality of preset contrast increasing values in the contrast adjusting option; after the television acquires the contrast increasing value input or selected by the user, the original contrast adjusting curve is determined according to the contrast increasing value.
In specific implementation, the original contrast adjustment curve is a curve constructed by taking the input gray scale as an abscissa and taking the output gray scale as an ordinate. FIG. 2 is a schematic diagram of an original contrast adjustment curve and a standard contrast adjustment curve corresponding to an image input gray scale and an image output gray scale of 0-255. In the actual contrast adjustment process, when the contrast increase value is 0, the image contrast is adjusted according to the standard contrast adjustment curve, namely the input brightness is equal to the output brightness; limited by the highest brightness value of the television, when the contrast increase value is larger than 0, and the contrast of the image is adjusted according to the original contrast adjustment curve, the brightness values of the (256-A) -256 gray scales are higher than the highest brightness value which can be reached by the television, and are leveled to the highest brightness value, and high gray scale whiting occurs.
In specific implementation, the equation corresponding to the original contrast adjustment curve is as follows: y is add ＝256/(256-A)*X add Wherein, Y add For the output gray scale, X, corresponding to the original contrast adjustment curve add The input gray scale corresponding to the original contrast adjustment curve is represented by A, which is the contrast increase value. After the contrast increasing value input or selected by the user is obtained, the original contrast adjusting curve can be determined according to the contrast increasing value. For example, when the contrast increment A is 64, the original contrast adjustment curve determined from the contrast increment corresponds to the equation Y add ＝256/(256-64)*X add 。
In a preferred embodiment of the present invention, the image contrast adjusting method further includes the steps of:
s200, acquiring a correction angle, and determining a correction curve according to the correction angle; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve.
In specific implementation, the correction curve is similar to the original contrast adjustment curve, and is also a curve constructed by taking the input gray scale as an abscissa and the output gray scale as an ordinate. Fig. 2 shows the correction curves corresponding to the image input gray scale and the output gray scale from 0 to 255. The slope of the correction curve is less than the slope of the original contrast adjustment curve. In this embodiment, the original contrast adjustment curve is corrected by using a correction curve having a slope smaller than that of the original contrast adjustment curve, so that the high gray scale brightness of the image can be reduced, the contrast of the image can be improved, and the problem of white inversion of the high gray scale of the image can be solved.
In specific implementation, the equation corresponding to the correction curve is as follows: y is clip ＝256-[(256-X gray )*tanΘ]Wherein Y is clip For correcting the output gray level, X, corresponding to the curve gray For the input gray level corresponding to the correction curve, Θ is the correction angle, which is determined by the contrast increase value. Contrast enhancement to user input or selectionAfter the value is obtained, the correction angle theta can be determined according to the contrast increasing value, and then a correction curve can be determined according to the correction angle theta. The correction angle is determined according to the contrast increasing value and is used for representing the correction depth of the original contrast adjustment curve, and the correction angle is larger, the original contrast adjustment curve is corrected more deeply, and the high gray scale brightness of the image is pulled down more. And adjusting the image contrast by using the original contrast adjustment curve after the angle correction, so that the image contrast is improved and the phenomenon of high gray scale whitening of the image is eliminated.
In one embodiment, the correction angle may be set according to the user's needs. After the user sets the correction angle, the correction angle theta can be directly obtained, and the equation Y corresponding to the correction curve in the previous step is used clip ＝256-[(256-X gray )*tanΘ]And determining a correction curve.
In another specific embodiment, in order to avoid that the user does not know how much the correction angle is set properly, the correction angle may also be determined directly according to the corresponding relationship between the correction angle and the contrast ratio increment value, in this embodiment, in step S200, the step of obtaining the correction angle specifically includes:
s210, determining the corresponding relation between the correction angle and a preset angle threshold value according to the corresponding relation between the contrast increasing value and the preset contrast threshold value;
s220, determining the correction angle according to the corresponding relation between the correction angle and the preset angle threshold.
In specific implementation, a preset contrast threshold and a preset angle threshold are preset in this embodiment, where the preset contrast threshold is a maximum contrast increase value that can be set by the television, and the preset angle threshold is a maximum correction angle that can be reached by the television. In a specific embodiment, the preset contrast increase value is 128, and the preset correction angle is any angle between 0 ° and 45 °, which can be specifically set according to user requirements.
Further, after a contrast increase value input or selected by a user is obtained, determining a corresponding relation between the correction angle and a preset angle threshold according to the corresponding relation between the contrast increase value and a preset contrast increase value; and then determining the correction angle according to the corresponding relation between the correction angle and a preset angle threshold value. Specifically, the contrast increase value and the preset contrast threshold and the correction angle change in proportion to the preset angle threshold, for example, when the contrast increase value is 64, the preset contrast threshold is 128, and the preset angle threshold is 45 °, the corresponding correction angle Θ =64 × 45 °/= 128=22.5 °.
In a preferred embodiment of the present invention, the image contrast adjusting method further includes the steps of:
s300, correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve.
In specific implementation, as can be seen from fig. 2 and the foregoing steps, when the contrast of an image is adjusted according to an original contrast adjustment curve, there is a region having a luminance value greater than the maximum luminance value that can be reached by a television, the luminance of this region is reduced to the maximum luminance value that can be reached by the television when the contrast is adjusted, and a phenomenon of high gray-scale whitening occurs when the image is displayed. In this embodiment, after the correction curve and the original contrast adjustment curve are determined, the original contrast adjustment curve is further corrected according to the correction curve to obtain a target contrast adjustment curve.
In one embodiment, step S300 specifically includes:
s310, acquiring an intersection point of the correction curve and the original contrast curve;
and S320, replacing the output gray scale corresponding to the original contrast curve from the intersection point to the high-order highest point with the output gray scale corresponding to the correction curve, and obtaining a target contrast curve.
In specific implementation, after the correction curve and the original contrast curve are obtained, the intersection point of the correction curve and the original contrast curve is further obtained. In the previous step, the equation corresponding to the original contrast curve is mentioned as Y add ＝256/(256-A)*X add Correction curveCorresponding equation is Y clip ＝256-[(256-X gray )*tanΘ]When ordering Y add ＝Y clip ，X add ＝X gray Then, the intersection point of the original contrast curve and the correction curve can be obtained. For example, when the contrast increase value a =64 and the correction angle Θ =30 °, Y clip ＝256-[(256-X gray )*tanΘ]＝108.2+0.57735*X gray When Y is add ＝Y clip 1.3333X add ＝108.2+0.57735*X gray Can find X add ＝X gray =143, i.e. the abscissa value of the intersection of the correction curve and the original contrast curve is 143.
In specific implementation, after an intersection point of an original contrast curve and a correction curve is obtained, an output gray scale corresponding to the original contrast curve from the intersection point to a high-order highest point is further replaced by an output gray scale corresponding to the correction curve, wherein the high-order highest point is a point corresponding to the original contrast curve when an input gray scale is maximum. For example, the contrast increase value a =64, the correction angle Θ =30 °, the input tone is 0 to 255, and the output tone of the original contrast adjustment curve is set from the intersection point, i.e., the point corresponding to the input tone of 143, to the high-order peak, i.e., the point corresponding to the input tone of 255, from 256/(256-a) × X add By substitution with 256- [ (256-X) gray )*tanΘ]And obtaining a target contrast curve. Because the slope of the correction curve is smaller than that of the original contrast adjustment curve, after the output gray scale from the intersection point to the high-order peak of the original contrast adjustment curve is replaced by the output gray scale of the correction curve, the brightness of the high gray scale region of the original contrast adjustment curve is reduced, and therefore the problem of high gray scale whitening in the image display process is solved.
In a specific embodiment, the step S320 is followed by the steps of:
and S330, smoothing the intersection.
In specific implementation, after the output gray scale corresponding to the original contrast adjustment curve from the intersection point to the high-order highest point is replaced with the output gray scale corresponding to the correction curve, in order to prevent the image at the intersection point from generating a transition watermark, in this embodiment, after the target contrast adjustment curve is obtained, several steps are further taken on two sides of the intersection point to perform gaussian smoothing, and the intersection point is subjected to smoothing processing, so that the image with the contrast adjusted according to the target contrast adjustment curve is prevented from generating the transition watermark. The smoothing process of the curve intersection is prior art, and is not described herein in detail in this embodiment.
In a preferred embodiment of the present invention, the image contrast adjusting method further includes the steps of:
s400, adjusting the image contrast according to the target contrast adjusting curve.
In specific implementation, after the target contrast adjustment curve is obtained, the image contrast is adjusted according to the target contrast adjustment curve. As shown in fig. 3, which is a schematic diagram of the target contrast adjustment curve obtained after the original contrast adjustment curve is corrected by the correction curve in fig. 2, it can be seen from fig. 3 that after the image contrast adjustment is performed according to the target contrast adjustment curve, the image contrast is enhanced, but the high gray scale portion is not leveled to the maximum brightness value, and the phenomenon of high-order gray scale whitening does not occur.
Based on the above embodiments, the present invention further provides a display device, a schematic block diagram of which can be shown in fig. 4. The device comprises a processor, a memory, a network interface, a display screen and a temperature sensor which are connected through a system bus. Wherein the processor of the device is configured to provide computational and control capabilities. The memory of the device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement an image contrast adjustment method. The display screen of the device can be a liquid crystal display screen or an electronic ink display screen, and the temperature sensor of the device is arranged in the device in advance and used for detecting the current operating temperature of internal equipment.
It will be appreciated by those skilled in the art that the block diagram of fig. 4 is a block diagram of only a portion of the structure associated with the inventive arrangements and is not intended to limit the devices to which the inventive arrangements may be applied, and that a particular device may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a display apparatus is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor when executing the computer program at least implementing the following steps:
acquiring a contrast increasing value of an image, and determining an original contrast adjusting curve according to the contrast increasing value;
acquiring a correction angle, and determining a correction curve according to the correction angle; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve;
correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve;
and adjusting the image contrast according to the target contrast adjusting curve.
In one embodiment, the processor when executing the computer program can further realize: acquiring an intersection point of the correction curve and the original contrast curve; replacing the output gray scale corresponding to the original contrast curve from the intersection point to the high-order highest point with the output gray scale corresponding to the correction curve to obtain a target contrast curve; and the high-order highest point is a point corresponding to the maximum input gray scale of the original contrast curve.
In one embodiment, the processor when executing the computer program can further realize: determining the corresponding relation between the correction angle and a preset angle threshold according to the corresponding relation between the contrast increasing value and a preset contrast threshold; and determining the correction angle according to the corresponding relation between the correction angle and the preset angle threshold.
In one embodiment, the processor, when executing the computer program, may further implement: and performing smoothing processing on the intersection points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases or other media used in the embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), rambus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
In summary, the present invention discloses an image contrast adjusting method, a display device and a storage medium, wherein the method includes: acquiring a contrast increasing value of an image, and determining an original contrast adjusting curve according to the contrast increasing value; acquiring a correction angle, and determining a correction curve according to the correction angle; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve; correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve; and adjusting the image contrast according to the target contrast adjusting curve. The method determines an original contrast adjustment curve according to the contrast increase value, then corrects the original contrast adjustment curve by using a correction curve with a slope smaller than that of the original contrast adjustment curve, adjusts the image contrast by using the corrected original contrast adjustment curve, reduces the brightness of a high gray scale part of an image, improves the image contrast and eliminates the phenomenon of high gray scale whitening of the image.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (7)
1. An image contrast adjusting method, comprising the steps of:
acquiring a contrast increasing value of an image, and determining an original contrast adjusting curve according to the contrast increasing value;
acquiring a correction angle, and determining a correction curve according to the correction angle; wherein the slope of the correction curve is less than the slope of the original contrast adjustment curve;
correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve;
adjusting the image contrast according to the target contrast adjustment curve;
the equation corresponding to the correction curve is as follows:
wherein the content of the first and second substances,
in order to correct the output gray scale corresponding to the curve,
in order to correct the input gray scale corresponding to the curve,
for correcting the angle, it is determined by the contrast increasing value or preset;
the correction angle is set according to the needs of a user or determined according to the corresponding relation between the correction angle and the contrast ratio increment value;
when the correction angle is determined according to the corresponding relationship between the correction angle and the contrast ratio increment value, the step of obtaining the correction angle specifically includes:
determining the corresponding relation between the correction angle and a preset angle threshold according to the corresponding relation between the contrast increasing value and a preset contrast threshold;
and acquiring the correction angle according to the corresponding relation between the correction angle and the preset angle threshold.
2. The method for adjusting image contrast of claim 1, wherein the original contrast adjustment curve corresponds to the following equation:
wherein, the first and the second end of the pipe are connected with each other,
for the output gray scale corresponding to the original contrast adjustment curve,
a is the contrast increment value for the input gray scale corresponding to the original contrast adjustment curve.
3. The method for adjusting image contrast according to claim 1, wherein the step of correcting the original contrast adjustment curve according to the correction curve to obtain a target contrast adjustment curve specifically includes:
acquiring an intersection point of the correction curve and the original contrast adjustment curve;
replacing the output gray scale corresponding to the original contrast adjustment curve from the intersection point to the high-order highest point with the output gray scale corresponding to the correction curve to obtain a target contrast adjustment curve; wherein the high-order highest point is a point corresponding to the maximum input gray scale of the original contrast adjustment curve.
4. The image contrast adjusting method according to claim 1, wherein the preset angle threshold is in a range of 0 ° to 45 °.
5. The method as claimed in claim 3, wherein the step of replacing the output gray scale corresponding to the original contrast adjustment curve from the intersection point to the highest point of the higher order with the output gray scale corresponding to the correction curve, and the step of obtaining the target contrast adjustment curve further comprises:
and smoothing the intersection points.
6. A display device, comprising: a processor, a storage medium communicatively coupled to the processor, the storage medium configured to store a plurality of computer programs; the processor is configured to invoke a computer program in the storage medium to perform the steps of implementing the image contrast adjustment method of any one of claims 1-5.
7. A storage medium having stored thereon a plurality of computer programs, wherein the computer programs are loaded and executed by a processor to perform the steps of implementing the image contrast adjustment method according to any one of claims 1 to 5.
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