WO2016041225A1 - 一种视频处理方法及装置 - Google Patents
一种视频处理方法及装置 Download PDFInfo
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- WO2016041225A1 WO2016041225A1 PCT/CN2014/088545 CN2014088545W WO2016041225A1 WO 2016041225 A1 WO2016041225 A1 WO 2016041225A1 CN 2014088545 W CN2014088545 W CN 2014088545W WO 2016041225 A1 WO2016041225 A1 WO 2016041225A1
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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
- G09G3/2007—Display of intermediate tones
- G09G3/2011—Display of intermediate tones by amplitude modulation
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/76—Circuitry for compensating brightness variation in the scene by influencing the image signals
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/20—Special algorithmic details
- G06T2207/20172—Image enhancement details
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
- G09G2340/0428—Gradation resolution change
Definitions
- the present invention relates to the field of liquid crystal display technologies, and in particular, to a video processing method and apparatus.
- the present invention constructs a video processing method, including:
- the brightness of all the pixels in the picture is subjected to brightness reduction processing using the first set attenuation coefficient
- the determining the attenuation coefficient according to the pixel luminance average value comprises:
- the attenuation coefficient is a second set attenuation coefficient
- the scaling factor of the attenuation coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- g2>g1 is the second set attenuation coefficient, and 0 ⁇ m ⁇ 1;
- the attenuation coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the determining the gain coefficient according to the pixel luminance average value comprises:
- the gain coefficient is a maximum value
- the scale factor of the gain coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- gmax is the maximum gain coefficient, gmax>1;
- the gain coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the range of the gain coefficient is:
- the range of the gain coefficient is:
- k is the gain coefficient and f is the highest brightness of the display device.
- m is the brightness of the maximum brightness pixel, and n is the first brightness threshold.
- the invention constructs a video processing method, which acquires a pixel brightness average value, a maximum brightness pixel, and a brightness enhancement threshold according to the brightness of all pixels in the picture; and distinguishes the set value according to the brightness and brightness of all pixels in the picture, and obtains a low value. a number of luma pixels; wherein the low-brightness pixels are pixels whose brightness is smaller than the brightness discrimination set value;
- the step of performing brightness reduction processing on the brightness of all pixels in the picture includes:
- the brightness of all the pixels in the picture is subjected to brightness reduction processing using the first set attenuation coefficient
- the attenuation coefficient is determined according to the pixel brightness average value, and the brightness of all pixels in the picture is subjected to brightness reduction processing using the attenuation coefficient.
- the determining the attenuation coefficient according to the pixel luminance average value comprises:
- the attenuation coefficient is a second set attenuation coefficient
- the scaling factor of the attenuation coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- g2>g1 is the second set attenuation coefficient, and 0 ⁇ m ⁇ 1;
- the attenuation coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the step of performing brightness enhancement processing on the brightness of all the first pixels in the picture includes:
- the brightness enhancement process is performed on the brightness of all the first pixels in the picture by using the set gain coefficient
- the determining the gain coefficient according to the pixel luminance average value comprises:
- the gain coefficient is a maximum value
- the scale factor of the gain coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- gmax is the maximum gain coefficient, gmax>1;
- the gain coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the range of the gain coefficient is:
- the range of the gain coefficient is:
- k is the gain coefficient and f is the highest brightness of the display device.
- m is the brightness of the maximum brightness pixel, and n is the first brightness threshold.
- Another object of the present invention is to provide a video processing apparatus, including an acquiring module, configured to acquire a pixel brightness average value, a maximum brightness pixel, and a brightness enhancement threshold according to brightness of all pixels in the picture; and according to brightness of all pixels in the picture. And the brightness distinguishes the set value, and obtains the number of low-brightness pixels; wherein the low-brightness pixel is a pixel whose brightness is smaller than the brightness-differentiated setting value;
- a brightness reduction module configured to perform brightness reduction processing on brightness of all pixels in the picture according to the pixel brightness average value and the number of the low brightness pixels
- a brightness increasing module configured to perform brightness enhancement processing on brightness of all first pixels in the picture according to the brightness of the maximum brightness pixel and the average brightness of the pixels, where the first pixel is brightness greater than the brightness a pixel that enhances the threshold;
- a brightness smoothing processing module configured to respectively set a smoothing process high brightness and a smoothing process low brightness, and perform brightness smoothing processing on the pixels whose brightness is between the smoothing process high brightness and the smoothing process low brightness;
- the smoothing process high brightness is higher than the brightness enhancement threshold, and the smoothing process low brightness is lower than the brightness enhancement threshold.
- the brightness reduction module is further configured to:
- the fixed value determines an attenuation coefficient according to the average brightness of the pixels, and performs brightness reduction processing on the brightness of all pixels in the picture using the attenuation coefficient.
- the brightness reduction module is further configured to: preset a first average threshold and a second average threshold; and average the pixel brightness average with the first average threshold and the second Average threshold comparison:
- the attenuation coefficient is a second set attenuation coefficient
- the scaling factor of the attenuation coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- g2>g1 is the second set attenuation coefficient, and 0 ⁇ m ⁇ 1;
- the attenuation coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the brightness increasing module is further configured to:
- the brightness enhancement process is performed on the brightness of all the first pixels in the picture by using the set gain coefficient
- the brightness increasing module is further configured to:
- the gain coefficient is a maximum value
- the scale factor of the gain coefficient as a function of the pixel brightness average is:
- g1 is the first average threshold
- g2 is the second average threshold
- gmax is the maximum gain coefficient, gmax>1;
- the gain coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the range of the gain coefficient is:
- the range of the gain coefficient is:
- k is the gain coefficient and f is the highest brightness of the display device.
- m is the brightness of the maximum brightness pixel, and n is the first brightness threshold.
- the brightness enhancement processing is performed first, and then the brightness enhancement processing is performed, so that the brightness of the pixel in the picture does not exceed the gray scale range, and after the smoothing process, the display screen is solved.
- the color shift problem that occurs.
- FIG. 1 is a flowchart of a video processing method according to a first embodiment of the present invention
- FIG. 3 is a gray scale comparison diagram before and after the brightness enhancement processing of the present invention.
- FIG. 4 is a schematic diagram of a brightness smoothing process of the present invention.
- FIG. 5 is a flowchart of a video processing method according to a second embodiment of the present invention.
- FIG. 6 is a schematic structural diagram of a video processing apparatus according to the present invention.
- FIG. 1 is a flowchart of a video processing method according to a first embodiment of the present invention.
- the video processing method of the present invention includes the following steps:
- S101 Acquire a pixel brightness average value, a maximum brightness pixel, and a brightness enhancement threshold according to brightness of all pixels in the picture; and distinguish the set value according to brightness and brightness of all pixels in the picture, and obtain the number of low brightness pixels.
- the pixel brightness average value, the maximum brightness pixel, and the brightness enhancement threshold may be obtained by calculation, such as generating a histogram of the picture, obtained from the histogram The pixel brightness average value and the maximum brightness pixel. And the set value is distinguished according to the brightness and brightness of all the pixels in the picture, and the number of the low-brightness pixels is obtained.
- the brightness distinguishing setting value is set according to a display effect of the screen. When the screen display is bright, the brightness distinguishing setting value is high; when the screen display is dark, the brightness distinguishing setting value is low.
- the low-brightness pixel is a pixel whose brightness is smaller than the brightness discrimination setting value. For example, the brightness of the maximum brightness pixel is 100, and the brightness discrimination setting value is 32, and the pixel whose brightness is less than 32 is the low brightness pixel.
- the brightness enhancement threshold is calculated according to the average value of the pixel brightness according to the formula 1, that is:
- thresh is the brightness enhancement threshold
- ave is the pixel brightness average
- N is a constant
- ⁇ is a standard deviation
- the brightness reduction processing may be performed on the brightness of all the pixels in the picture, which will be described in detail with reference to the accompanying drawings for convenience of understanding.
- Figure 2 shows a gray scale comparison chart before and after the brightness reduction process. Assuming that the gray scale value ranges from 0 to 255, since the gray scale value corresponds to the brightness (the larger the gray scale value is, the greater the brightness), the change in the brightness can be obtained from the change of the gray scale map. As shown in FIG.
- the abscissa represents the gray scale (brightness) of all the pixels in the input picture
- the ordinate represents the gray scale (brightness) of all the pixels in the output image
- the line a indicates that the brightness is not weakened.
- the brightness of all pixels in the processed picture the line b represents the brightness of all pixels in the picture subjected to the brightness reduction process. It is not difficult to see that the output amplitude of the straight line b is smaller than the output amplitude of the straight line a.
- the brightness of all the pixels in the picture is subjected to brightness reduction processing, thereby avoiding excessive brightness degradation when the low-brightness pixels are excessive, resulting in blurring of the picture. problem.
- Figure 3 shows a gray scale comparison chart before and after the brightness enhancement process.
- the gray scale value ranges from 0 to 255
- the abscissa represents the gray scale (brightness) of all pixels in the input picture
- the ordinate represents the gray scale of all pixels in the output image. (brightness); wherein the straight line b represents the brightness of all the pixels in the picture subjected to the brightness reduction processing, the line c represents the brightness of the first pixel after the brightness enhancement processing, and the gray level value corresponding to the brightness enhancement threshold
- the portion of the pixel is referred to as the first pixel, and therefore only the first pixel is subjected to brightness enhancement processing, thereby obtaining a line c brightness.
- the brightness of the first pixel after the brightness increase processing is greater than the brightness before the brightness increase processing.
- Brightness enhancement processing is performed on the brightness of all the pixels in the picture by combining the brightness of the maximum brightness pixel and the average brightness of the pixels, thereby avoiding too much brightness enhancement when the non-low-brightness pixels are excessive, resulting in distortion of the picture. The problem.
- S104 respectively, setting a smoothing process high brightness and a smoothing process low brightness, and performing brightness smoothing processing on the pixels whose brightness is between the smoothing high brightness and the smoothing low brightness; wherein the smoothing process is high The brightness is higher than the brightness enhancement threshold, and the smoothing process low brightness is lower than the brightness enhancement threshold.
- step S103 since the brightness increase amplitude of the pixel in the vicinity of the brightness enhancement threshold (near the h point) after the brightness increase processing is large in step S103, color shift occurs on the display screen. Therefore, it is necessary to perform luminance smoothing processing on the luminance of the pixel in the vicinity of the luminance enhancement threshold (near the point h).
- FIG. 4 shows a schematic diagram of the luminance smoothing process.
- the abscissa represents the gray scale (brightness) of all pixels in the input picture, and the ordinate represents the gray scale (brightness) of all pixels in the output image;
- the brightness smoothing processing is, for example, that the brightness is less than the brightness enhancement Selecting a smoothing process low brightness in the pixels of the threshold, corresponding to the point B in the gray scale image, selecting a smoothing high brightness in the pixels whose brightness is greater than the brightness enhancement threshold, corresponding to the point A in the gray scale image, respectively
- the B and A points are used as the parabola d of the opening upward, since the growth amplitude of the parabola d changes slowly, the brightness of the pixel near the brightness enhancement threshold (near the h point) is overcome to change rapidly.
- the problem solves the color cast problem of the display screen.
- the brightness enhancement processing is performed first, and then the brightness enhancement processing is performed, so that the brightness of the pixel in the picture does not exceed the gray scale range, and after smoothing, the display screen is solved. Color shift problem.
- FIG. 5 is a flowchart of a video processing method according to a second embodiment of the present invention.
- the video processing method of the present invention includes the following steps:
- S201 Acquire a pixel brightness average value, a maximum brightness pixel, and a brightness enhancement threshold according to brightness of all pixels in the picture; and distinguish the set value according to brightness and brightness of all pixels in the picture, and obtain the number of low brightness pixels.
- the pixel brightness average value, the maximum brightness pixel, and the brightness enhancement threshold may be obtained by calculation.
- the histogram is generated from the picture, and the pixel luminance average value and the maximum brightness pixel are obtained from the histogram.
- the set value is distinguished according to the brightness and brightness of all the pixels in the picture, and the number of the low-brightness pixels is obtained.
- the brightness distinguishing setting value is set according to a display effect of the screen. When the screen display is bright, the brightness distinguishing setting value is high; when the screen display is dark, the brightness distinguishing setting value is low.
- the low-brightness pixel is a pixel whose brightness is smaller than the brightness discrimination setting value. For example, the brightness of the maximum brightness pixel is 100, and the brightness discrimination setting value is 32, and the pixel whose brightness is less than 32 is the low brightness pixel.
- the brightness enhancement threshold is calculated according to the average value of the pixel brightness according to the formula 1, that is:
- thresh is the brightness enhancement threshold
- ave is the pixel brightness average
- N is a constant
- ⁇ is a standard deviation
- the second brightness threshold threshold is a preset value, for example, the second brightness threshold threshold may be set according to a human eye's feeling, when the screen is When the average pixel luminance is greater than or equal to the second luminance threshold, the method ends.
- step S203 is performed.
- the low-brightness pixel is a pixel whose brightness is smaller than the brightness discrimination setting value.
- step S204 is performed; when the number of the low-brightness pixels is less than or equal to the quantity setting value, step S205 is performed.
- S205 specifically includes: setting a first average threshold and a second average threshold (the second average threshold is greater than the first average threshold); and setting the pixel luminance average value to the first average threshold and the first Two average threshold comparisons:
- the attenuation coefficient is a second set attenuation coefficient; and the second set attenuation coefficient is set according to a display effect of the screen.
- the second set attenuation coefficient is less than 1 and greater than zero.
- Equation 2 the proportional coefficient of the attenuation coefficient that varies with the pixel brightness average is as shown in Equation 2:
- g1 is the first average threshold
- g2 is the second average threshold
- g2>g1 is the second set attenuation coefficient, and 0 ⁇ m ⁇ 1;
- the attenuation coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the attenuation coefficient is determined by combining the average brightness of the pixels and the number of the low-brightness pixels, so that when the low-brightness pixels are excessive, the attenuation coefficient is excessively large, thereby causing a problem that the picture appears distorted.
- the specific process of the brightness reduction process is: performing brightness reduction processing on the brightness of all pixels in the picture according to the attenuation coefficient obtained in step S204 or S205, for example, multiplying the brightness of all pixels in the picture by the
- the attenuation coefficient can of course be other ways. For ease of understanding, the details are described in conjunction with the drawings. Combined with Figure 2. Assuming that the gray scale range is between 0 and 255, since the gray scale corresponds to the brightness (the larger the gray scale, the greater the brightness), the change in the brightness can be obtained from the change of the gray scale map. As shown in FIG.
- the abscissa represents the gray scale (brightness) of all the pixels in the input picture
- the ordinate represents the gray scale (brightness) of all the pixels in the output image
- the line a indicates that the brightness is not weakened.
- the brightness of all pixels in the processed picture the line b represents the brightness of all pixels in the picture subjected to the brightness reduction process. It is not difficult to see that the output amplitude of the straight line b is smaller than the output amplitude of the straight line a.
- step S207 When the brightness of the maximum brightness pixel is greater than the first brightness threshold, step S207 is performed; when the brightness of the maximum brightness pixel is less than or equal to the first brightness threshold, step S208 is performed.
- the first brightness threshold is determined according to a screen display effect.
- S207 specifically includes: setting a first average threshold in advance and a second average threshold (the second average threshold is greater than the first average threshold);
- the gain coefficient is a maximum value
- Equation 3 the proportional coefficient of the gain coefficient as a function of the pixel brightness average is as shown in Equation 3:
- g1 is the first average threshold
- g2 is the second average threshold
- gmax is the maximum gain coefficient, gmax>1;
- the brightness enhancement module has a gain coefficient of 1 when the pixel brightness average is greater than or equal to the second average threshold.
- the range of the gain coefficient is:
- the range of the gain coefficient is:
- k is the gain coefficient
- f is the highest brightness of the display device (ie, the highest brightness that the display device can display)
- m is the brightness of the maximum brightness pixel
- n is the first brightness threshold.
- the gain coefficient is determined by combining the brightness of the maximum brightness pixel and the pixel brightness average value, so that when the number of the non-low brightness pixels is too large, the gain coefficient is large, so that the brightness of the picture exceeds the gray scale range. , affects the effect of the screen display.
- the specific process of the brightness enhancement process is: performing brightness enhancement processing on the brightness of all the first pixels in the picture according to the gain coefficients obtained in steps S207 and S208, for example, multiplying the brightness of all the first pixels in the picture by the above Gain factor.
- the abscissa represents the gray scale (brightness) of all pixels in the input picture
- the ordinate represents the gray scale (brightness) of all pixels in the output image
- the line b represents the brightness reduction processing
- the line c represents the brightness of the first pixel after the brightness enhancement process
- the gray level of the brightness enhancement threshold corresponds to h, because the brightness of the pixel of the dotted line of the line b is greater than
- the brightness enhancement threshold is described, so that only a part of the pixels are subjected to brightness enhancement processing, thereby obtaining the brightness indicated by the line c.
- the brightness of the first pixel after the brightness increase processing is greater than the brightness before the brightness increase processing.
- the abscissa represents the gray scale (brightness) of all pixels in the input picture, and the ordinate represents the gray scale (brightness) of all pixels in the output image;
- the brightness smoothing processing is, for example, that the brightness is less than the brightness enhancement Selecting a smoothing process low brightness in the pixels of the threshold, corresponding to the point B in the gray scale image, selecting a smoothing high brightness in the pixels whose brightness is greater than the brightness enhancement threshold, corresponding to the point A in the gray scale image, respectively
- the parabola d of the opening upward is slowed by the growth amplitude of the parabola d, thereby overcoming the problem that the brightness of the pixel near the brightness enhancement threshold (near the point h) is increased rapidly. , thereby solving the color shift problem of the display screen.
- the brightness enhancement processing is performed first, and then the brightness enhancement processing is performed, so that the brightness of the pixel in the picture does not exceed the gray scale range, and after smoothing, the display screen is solved. Color shift problem.
- FIG. 6 is a schematic structural diagram of a video processing apparatus according to the present invention.
- the present invention further provides a video processing apparatus, comprising: an acquisition module 10, a brightness reduction module 11, a brightness increase module 12, and a brightness smoothing processing module 13.
- the acquiring module 10 is configured to obtain a pixel brightness average value, a maximum brightness pixel, and a brightness enhancement threshold according to brightness of all pixels in the picture; and distinguish the set value according to brightness and brightness of all pixels in the picture, and obtain the number of low-brightness pixels.
- the low-brightness pixel is a pixel whose brightness is smaller than the brightness discrimination setting value;
- the brightness reduction module 11 is configured to perform brightness reduction processing on brightness of all pixels in the picture according to the pixel brightness average value and the number of the low brightness pixels;
- the brightness increasing module 12 is configured to perform brightness enhancement processing on all first pixels in the picture according to the brightness of the maximum brightness pixel and the average brightness of the pixels, where the first pixel is brightness greater than the brightness a pixel that enhances the threshold;
- the brightness smoothing processing module 13 performs brightness smoothing processing on the pixels whose brightness is between the smoothing high luminance and the smoothing low luminance by respectively setting a smoothing processing high luminance and a smoothing processing low luminance. Wherein the smoothing process high brightness is higher than the brightness enhancement threshold, and the smoothing process low brightness is lower than the brightness enhancement threshold.
- the specific processing procedure of the brightness reduction module 11 is:
- the fixed value determines an attenuation coefficient according to the average brightness of the pixels, and performs brightness reduction processing on the brightness of all pixels in the picture using the attenuation coefficient.
- the brightness reduction module 11 specifically processes: first setting a first average threshold and a second average threshold; comparing the pixel brightness average with the first average threshold and the second average threshold respectively:
- the attenuation coefficient is a second set attenuation coefficient
- Equation 2 the proportional coefficient of the attenuation coefficient that varies with the pixel brightness average is as shown in Equation 2:
- g1 is the first average threshold
- g2 is the second average threshold
- g2>g1 is the second set attenuation coefficient, and 0 ⁇ m ⁇ 1;
- the attenuation coefficient is 1 when the pixel luminance average value is greater than or equal to the second average threshold.
- the specific processing procedure of the brightness increasing module 12 is:
- the brightness enhancement process is performed on the brightness of all the first pixels in the picture by using the set gain coefficient
- the video processing apparatus of the present invention can implement any of the above video processing methods. Since the video processing method has been described in detail above, it will not be described herein.
- the brightness enhancement processing is performed first, and then the brightness enhancement processing is performed, so that the brightness of the pixels in the picture does not exceed the gray scale range, and after smoothing, the display screen is solved. Color shift problem.
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Abstract
一种视频处理方法及装置,其中,该视频处理方法包括:对画面中所有像素的亮度进行亮度减弱处理(S102);对画面中所有第一像素的亮度进行亮度增强处理(S103);对亮度处于平滑处理高亮度以及平滑处理低亮度之间的像素进行亮度平滑处理(S104)。该视频处理方法及装置,使得画面中的像素的亮度不会超出灰阶范围。
Description
本发明涉及液晶显示器技术领域,特别是涉及一种视频处理方法及装置。
目前随着液晶显示器画质的不断提升,出现了很多提高显示器对比度的视频处理方法,常见的一种是将输入视频信号中超过一定亮度范围的像素的亮度先进行增强处理后,再对画面中的所有像素的亮度压缩处理。但是这种方式得到的画面的像素超出了显示器的灰阶范围,必须舍弃掉超出灰阶范围的像素。因此,使得画面的颜色饱和度下降,从而导致显示出的画面的颜色出现偏差,从而影响观看质量。
因此,有必要提供一种视频处理方法及装置,以解决现有技术所存在的问题。
本发明的目的在于提供一种视频处理方法及装置,以降低画面出现的色偏问题。
为解决上述技术问题,本发明构造了一种视频处理方法,包括:
根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;
当所述低亮度像素的数量大于数量设定值时,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;
当所述低亮度像素的数量小于等于所述数量设定值时,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;
当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理,其中,所述第一像素为亮度大于所述亮度增强阈值的像素;
当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所述第一像素进行亮度增强处理;以及
分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
在本发明的视频处理方法中,所述根据所述像素亮度平均值确定所述衰减系数包括:
预先设置第一平均阈值和第二平均阈值;
将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:
(1-m)/(g2-g1);
其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
在本发明的视频处理方法中,所述根据所述像素亮度平均值确定所述增益系数包括:
预先设置第一平均阈值时和第二平均阈值;
将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:
(1-gmax)/(g2-g1);
其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
在本发明的视频处理方法中,当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /n);
当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /m);
其中,k为所述增益系数,f为显示装置具有的最高亮度,
m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
本发明构造了一种视频处理方法,根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;
根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理;
根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素的亮度进行亮度增强处理,所述第一像素为亮度大于所述亮度增强阈值的像素;以及
分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
在本发明的视频处理方法中,所述对所述画面中所有像素的亮度进行亮度减弱处理的步骤包括:
当所述低亮度像素的数量大于数量设定值时,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;
当所述低亮度像素的数量小于等于所述数量设定值时,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
在本发明的视频处理方法中,所述根据所述像素亮度平均值确定所述衰减系数包括:
预先设置第一平均阈值和第二平均阈值;
将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:
(1-m)/(g2-g1);
其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
在本发明的视频处理方法中,所述对所述画面中所有第一像素的亮度进行亮度增强处理的步骤包括:
当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;
当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所述第一像素进行亮度增强处理。
在本发明的视频处理方法中,所述根据所述像素亮度平均值确定所述增益系数包括:
预先设置第一平均阈值时和第二平均阈值;
将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:
(1-gmax)/(g2-g1);
其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
在本发明的视频处理方法中,当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /n);
当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /m);
其中,k为所述增益系数,f为显示装置具有的最高亮度,
m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
本发明的另一个目的在于提供一种视频处理装置,包括获取模块,用于根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;
亮度降低模块,用于根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理;
亮度增大模块,用于根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素的亮度进行亮度增强处理,所述第一像素为亮度大于所述亮度增强阈值的像素;以及
亮度平滑处理模块,用于分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
在本发明的视频处理装置中,所述亮度降低模块还用于:
当所述低亮度像素的数量大于数量设定值,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述低亮度像素的数量小于等于所述数量设定值,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
在本发明的视频处理装置中,所述亮度降低模块还用于:预先设置第一平均阈值和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:
(1-m)/(g2-g1);
其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
在本发明的视频处理装置中,所述亮度增大模块还用于:
当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;
当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所有第一像素的亮度进行亮度增强处理。
在本发明的视频处理装置中,所述亮度增大模块还用于:
预先设置第一平均阈值时和第二平均阈值;
将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:
(1-gmax)/(g2-g1);
其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
在本发明的视频处理装置中,当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /n);
当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /m);
其中,k为所述增益系数,f为显示装置具有的最高亮度,
m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
本发明的视频处理方法及装置,由于先进行亮度减弱处理,再进行亮度增强处理,从而使得画面中的所述像素的亮度不会超出灰阶范围,同时再经过平滑处理后,解决了显示画面出现的色偏问题。
图1为本发明第一实施例的视频处理方法的流程图;
图2为本发明的亮度减弱处理前后的灰阶对照图;
图3为本发明的亮度增强处理前后的灰阶对照图;
图4为本发明的亮度平滑处理的示意图;
图5为本发明第二实施例的视频处理方法的流程图;
图6为本发明的视频处理装置的结构示意图。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
以下各实施例的说明是参考附加的图式,用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语,例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等,仅是参考附加图式的方向。因此,使用的方向用语是用以说明及理解本发明,而非用以限制本发明。在图中,结构相似的单元是以相同标号表示。
请参照图1,图1为本发明第一实施例的视频处理方法的流程图。
如图1所示,本发明的视频处理方法包括以下步骤:
S101、根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量。
当已知画面中所有像素的亮度,可以通过计算获得所述像素亮度平均值、所述最大亮度像素、以及所述亮度增强阈值,譬如将所述画面生成直方图,从所述直方图中得到所述像素亮度平均值、以及所述最大亮度像素。并根据画面中所有像素的亮度以及亮度区分设定值,获取所述低亮度像素的数量。所述亮度区分设定值是根据画面的显示效果设置的,当画面显示较亮时,所述亮度区分设定值较高;当画面显示较暗时,所述亮度区分设定值较低。其中所述低亮度像素为亮度小于所述亮度区分设定值的像素。譬如所述最大亮度像素的亮度为100,所述亮度区分设定值为32,其中亮度小于32的像素为所述低亮度像素。
所述亮度增强阈值,其根据所述像素亮度平均值根据公式1计算得到,即:
thresh=ave+Nσ 公式(1)
其中,thresh为所述亮度增强阈值, ave为像素亮度平均值,N为常数,σ为标准方差。
S102、根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理。
根据S101步骤获取的所述像素亮度平均值以及所述低亮度像素的数量,就可以对所述画面中所有像素的亮度进行亮度减弱处理,为了便于理解,结合附图详细说明。图2给出了亮度减弱处理前后的灰阶对照图。假设灰阶值范围在0-255之间,由于灰阶值和亮度相对应(灰阶值越大,亮度越大),因此从灰阶图的变化可以得出亮度的变化。如图2所示,横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);其中直线a表示未进行亮度减弱处理的所述画面中所有像素的亮度,直线b表示经过亮度减弱处理的所述画面中所有像素的亮度。不难看出,直线b的输出幅度小于直线a的输出幅度。
由于结合所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理,从而避免当低亮度像素过多时,亮度减弱过多,导致画面出现模糊的问题。
S103、根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素的亮度进行亮度增强处理。
将所述画面中的所有像素和所述亮度增强阈值比较,将亮度大于所述亮度增强阈值的像素称为第一像素;对经过所述亮度减弱处理后的所有第一像素的亮度进行亮度增强处理。
为了便于理解,结合附图详细说明。图3给出了亮度增强处理前后的灰阶对照图。
如图3所示,假设灰阶值范围在0-255之间,横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);其中直线b表示经过亮度减弱处理的所述画面中所有像素的亮度,直线c表示经过亮度增强处理后的所述第一像素的亮度,所述亮度增强阈值对应的灰阶值大小为h,由于直线b的虚线部分的像素的亮度大于所述亮度增强阈值,将这部分像素称为第一像素,因此仅对所述第一像素进行亮度增强处理,从而得到直线c所示的亮度。经过所述亮度增处理后的所述第一像素的亮度大于未经过所述亮度增处理前的亮度。
由于结合所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有像素的亮度进行亮度增强处理,从而避免当非低亮度像素过多时,亮度增强太多,导致画面出现失真的问题。
S104、分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
但是由于在步骤S103中,经过所述亮度增处理后在所述亮度增强阈值附近(h点附近)的所述像素的亮度增长幅度变化较大,会使得显示画面出现色偏。因此有必要对所述亮度增强阈值附近(h点附近)的所述像素的亮度进行亮度平滑处理。
图4给出了亮度平滑处理的示意图。横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);所述亮度平滑处理譬如为在亮度小于所述亮度增强阈值的像素中选择一平滑处理低亮度,其在灰阶图中对应点B,在亮度大于所述亮度增强阈值的像素中选择一平滑处理高亮度,其在灰阶图中对应点A,分别过B、A点作开口向上的抛物线d,由于所述抛物线d的增长幅度变化缓慢,因而克服了所述亮度增强阈值附近(h点附近)的所述像素的亮度的增长幅度变化较快的问题,从而解决了显示画面的色偏问题。
本发明的视频处理方法,由于先进行亮度减弱处理,再进行亮度增强处理,从而使得画面中的所述像素的亮度不会超出灰阶范围,同时再经过平滑处理后,解决了显示画面出现的色偏问题。
请参照图5,图5为本发明第二实施例的视频处理方法的流程图;
如图5所示,本发明的视频处理方法包括以下步骤:
S201、根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量。
当已知画面中所有像素的亮度,可以通过计算获得所述像素亮度平均值、所述最大亮度像素、所述亮度增强阈值。譬如将所述画面生成直方图,从所述直方图中得到所述像素亮度平均值以及所述最大亮度像素。并根据画面中所有像素的亮度以及亮度区分设定值,获取所述低亮度像素的数量。所述亮度区分设定值是根据画面的显示效果设置的,当画面显示较亮时,所述亮度区分设定值较高;当画面显示较暗时,所述亮度区分设定值较低。其中所述低亮度像素为亮度小于所述亮度区分设定值的像素。譬如所述最大亮度像素的亮度为100,所述亮度区分设定值为32,其中亮度小于32的像素为所述低亮度像素。
所述亮度增强阈值,其根据所述像素亮度平均值根据公式1计算得到,即:
thresh=ave+Nσ 公式(1)
其中,thresh为所述亮度增强阈值, ave为像素亮度平均值,N为常数,σ为标准方差。
S202、判断所述像素亮度平均值是否大于等于第二亮度阀值阈值。
即判断整个所述画面是否需要进行对比度增强处理,所述第二亮度阀值阈值为预设值,譬如所述第二亮度阀值阈值可以根据人眼的感受设定,当所述画面中所述像素亮度平均值大于等于所述第二亮度阈值时,结束本方法。当所述画面中所述像素亮度平均值小于所述第二亮度阈值时,执行步骤S203。
S203、判断所述低亮度像素的数量是否大于数量设定值。
所述低亮度像素为亮度小于亮度区分设定值的像素。当所述低亮度像素的数量大于所述数量设定值时,进行步骤S204;当所述低亮度像素的数量小于等于所述数量设定值时,进行步骤S205。
S204、当所述低亮度像素的数量大于所述数量设定值时,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;所述第一设定衰减系数根据画面的显示效果设定。
S205、当所述低亮度像素的数量小于等于数量设定值时,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
S205具体包括:预先设置第一平均阈值和第二平均阈值(所述第二平均阈值大于所述第一平均阈值);将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;所述第二设定衰减系数根据画面的显示效果设定。所述第二设定衰减系数小于1大于0。
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为公式2所示:
(1-m)/(g2-g1); 公式(2)
其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
由于结合所述像素亮度平均值以及所述低亮度像素的数量,确定所述衰减系数,避免当低亮度像素过多时,所述衰减系数过大,从而导致画面出现失真的问题。
所述亮度减弱处理具体过程为,根据S204或者S205步骤获取的衰减系数,就可以对所述画面中所有像素的亮度进行亮度减弱处理,譬如是将所述画面中所有像素的亮度乘以所述衰减系数,当然也可以为其他的方式。为了便于理解,结合附图详细说明。结合图2。假设灰阶范围在0-255之间,由于灰阶和亮度相对应(灰阶越大,亮度越大),因此从灰阶图的变化可以得出亮度的变化。如图2所示,横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);其中直线a表示未进行亮度减弱处理的所述画面中所有像素的亮度,直线b表示经过亮度减弱处理的所述画面中所有像素的亮度。不难看出,直线b的输出幅度小于直线a的输出幅度。
S206、判断所述最大亮度像素的亮度是否大于所述第一亮度阈值。
当所述最大亮度像素的亮度大于所述第一亮度阈值时,进行步骤S207;当所述最大亮度像素的亮度小于等于所述第一亮度阈值时,进行步骤S208。所述第一亮度阈值根据画面显示效果确定。
S207、当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所述第一像素进行亮度增强处理。
S207具体包括:预先设置第一平均阈值时和第二平均阈值(所述第二平均阈值大于所述第一平均阈值);
将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为公式3所示:
(1-gmax)/(g2-g1); 公式(3)
其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述亮度增强模块的增益系数为1。
当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /n);
当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:
1<k<(f /m);
其中,k为所述增益系数,f为显示装置具有的最高亮度(即显示装置能够显示的最高亮度),m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
通过结合所述最大亮度像素的亮度以及所述像素亮度平均值,确定所述增益系数,避免当所述非低亮度像素数量过多时,所述增益系数较大,使得画面的亮度超出灰阶范围,影响画面显示的效果。
S208、当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;所述设定增益系数根据画面显示效果确定。
所述亮度增强处理具体过程为:根据步骤S207、S208得到的增益系数,对所述画面中所有第一像素的亮度进行亮度增强处理,譬如将所述画面中所有第一像素的亮度乘以上述增益系数。
将所述画面中的所有像素和所述亮度增强阈值比较,将亮度大于所述亮度增强阈值的像素称为第一像素;对经过所述亮度减弱处理后的所有第一像素的亮度进行亮度增强处理。
为了便于理解,结合附图详细说明。结合图3,横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);其中直线b表示经过亮度减弱处理的所述画面中所有像素的亮度,直线c表示经过亮度增强处理后的所述第一像素的亮度,所述亮度增强阈值对应的灰阶大小为h,由于直线b的虚线部分的像素的亮度大于所述亮度增强阈值,因此仅对该部分像素进行亮度增强处理,从而得到直线c所示的亮度。经过所述亮度增处理后的所述第一像素的亮度大于未经过所述亮度增处理前的亮度。
S209、分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
结合图4,由于在步骤S207或者S208中,经过所述亮度增处理后在所述亮度增强阈值附近(h点附近)的所述像素的亮度增长幅度变化较快,会使得显示画面出现色偏。因此有必要对所述亮度增强阈值附近(h点附近)的所述像素的亮度进行亮度平滑处理。
横坐标表示输入的所述画面中所有像素的灰阶(亮度),纵坐标表示输出的所述画面中所有像素的灰阶(亮度);所述亮度平滑处理譬如为在亮度小于所述亮度增强阈值的像素中选择一平滑处理低亮度,其在灰阶图中对应点B,在亮度大于所述亮度增强阈值的像素中选择一平滑处理高亮度,其在灰阶图中对应点A,分别过B、A点作开口向上的抛物线d,由于所述抛物线d的增长幅度变化缓慢,因而克服了所述亮度增强阈值附近(h点附近)的所述像素的亮度的增长幅度较快的问题,从而解决了显示画面的色偏问题。
本发明的视频处理方法,由于先进行亮度减弱处理,再进行亮度增强处理,从而使得画面中的所述像素的亮度不会超出灰阶范围,同时再经过平滑处理后,解决了显示画面出现的色偏问题。
请参照图6,图6为本发明的视频处理装置的结构示意图;
本发明还提供了一种视频处理装置,其包括:获取模块10,亮度降低模块11,亮度增大模块12,亮度平滑处理模块13。
所述获取模块10,能够根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;
所述亮度降低模块11,能够根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理;
所述亮度增大模块12,能够根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素进行亮度增强处理,所述第一像素为亮度大于所述亮度增强阈值的像素;以及
所述亮度平滑处理模块13,通过分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
优选地,所述亮度降低模块11具体处理过程为:
当所述低亮度像素的数量大于数量设定值,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述低亮度像素的数量小于等于所述数量设定值,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
优选地,所述亮度降低模块11具体处理过程为:预先设置第一平均阈值和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:
当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;
当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为公式2所示:
(1-m)/(g2-g1); 公式(2)
其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;
当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
优选地,所述亮度增大模块12具体处理过程为:
当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;
当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所有第一像素的亮度进行亮度增强处理。
本发明的视频处理装置可以实现上述任何一种视频处理方法,鉴于视频处理方法在上文已有详细说明,此处不再赘述。
本发明的视频处理装置,由于先进行亮度减弱处理,再进行亮度增强处理,从而使得画面中的所述像素的亮度不会超出灰阶范围,同时再经过平滑处理后,解决了显示画面出现的色偏问题。
综上所述,虽然本发明已以优选实施例揭露如上,但上述优选实施例并非用以限制本发明,本领域的普通技术人员,在不脱离本发明的精神和范围内,均可作各种更动与润饰,因此本发明的保护范围以权利要求界定的范围为准。
Claims (16)
- 一种视频处理方法,其包括:根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;当所述低亮度像素的数量大于数量设定值时,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述低亮度像素的数量小于等于所述数量设定值时,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理,其中所述第一像素为亮度大于所述亮度增强阈值的像素;当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所述第一像素进行亮度增强处理;以及分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
- 根据权利要求1所述的视频处理方法,其中所述根据所述像素亮度平均值确定所述衰减系数包括:预先设置第一平均阈值和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:(1-m)/(g2-g1);其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
- 根据权利要求1所述的视频处理方法,其中所述根据所述像素亮度平均值确定所述增益系数包括:预先设置第一平均阈值时和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:(1-gmax)/(g2-g1);其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
- 根据权利要求1所述的视频处理方法,其中当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /n);当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /m);其中,k为所述增益系数,f为显示装置具有的最高亮度, m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
- 一种视频处理方法,其包括:根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素、以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理;根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素的亮度进行亮度增强处理,所述第一像素为亮度大于所述亮度增强阈值的像素;以及分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
- 根据权利要求5所述的视频处理方法,其中所述对所述画面中所有像素的亮度进行亮度减弱处理的步骤包括:当所述低亮度像素的数量大于数量设定值时,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述低亮度像素的数量小于等于所述数量设定值时,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
- 根据权利要求6所述的视频处理方法,其中所述根据所述像素亮度平均值确定所述衰减系数包括:预先设置第一平均阈值和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:(1-m)/(g2-g1);其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
- 根据权利要求5所述的视频处理方法,其中所述对所述画面中所有第一像素的亮度进行亮度增强处理的步骤包括:当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所述第一像素进行亮度增强处理。
- 根据权利要求8所述的视频处理方法,其中所述根据所述像素亮度平均值确定所述增益系数包括:预先设置第一平均阈值时和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:(1-gmax)/(g2-g1);其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
- 根据权利要求8所述的视频处理方法,其中 当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /n);当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /m);其中,k为所述增益系数,f为显示装置具有的最高亮度, m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
- 一种视频处理装置,其包括:获取模块,用于根据画面中所有像素的亮度,获取像素亮度平均值、最大亮度像素以及亮度增强阈值;并根据画面中所有像素的亮度以及亮度区分设定值,获取低亮度像素的数量;其中所述低亮度像素为亮度小于所述亮度区分设定值的像素;亮度降低模块,用于根据所述像素亮度平均值以及所述低亮度像素的数量,对所述画面中所有像素的亮度进行亮度减弱处理;亮度增大模块,用于根据所述最大亮度像素的亮度以及所述像素亮度平均值,对所述画面中所有第一像素的亮度进行亮度增强处理,所述第一像素为亮度大于所述亮度增强阈值的像素;以及亮度平滑处理模块,用于分别设定一平滑处理高亮度以及一平滑处理低亮度,对亮度处于所述平滑处理高亮度以及所述平滑处理低亮度之间的所述像素进行亮度平滑处理;其中所述平滑处理高亮度高于所述亮度增强阈值,所述平滑处理低亮度低于所述亮度增强阈值。
- 根据权利要求11所述的视频处理装置,其中所述亮度降低模块还用于:当所述低亮度像素的数量大于数量设定值,则使用第一设定衰减系数对所述画面中所有像素的亮度进行亮度减弱处理;当所述低亮度像素的数量小于等于所述数量设定值,则根据所述像素亮度平均值确定衰减系数,并使用所述衰减系数对所述画面中所有像素的亮度进行亮度减弱处理。
- 根据权利要求12所述的视频处理装置,其中所述亮度降低模块还用于:预先设置第一平均阈值和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述衰减系数为第二设定衰减系数;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述衰减系数随所述像素亮度平均值变化的比例系数为:(1-m)/(g2-g1);其中,g1为所述第一平均阈值,g2为所述第二平均阈值,且g2>g1,m为所述第二设定衰减系数,且0<m<1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述衰减系数为1。
- 根据权利要求11所述的视频处理装置,其中所述亮度增大模块还用于:当所述最大亮度像素的亮度小于等于第一亮度阈值时,则使用设定增益系数对所述画面中所有第一像素的亮度进行亮度增强处理;当所述最大亮度像素的亮度大于所述第一亮度阈值时,则根据所述像素亮度平均值确定增益系数,并使用所述增益系数对所述画面中所有第一像素的亮度进行亮度增强处理。
- 根据权利要求14所述的视频处理装置,其中所述亮度增大模块还用于:预先设置第一平均阈值时和第二平均阈值;将所述像素亮度平均值分别与所述第一平均阈值时和所述第二平均阈值比较:当所述像素亮度平均值小于等于所述第一平均阈值时,所述增益系数为最大值;当所述像素亮度平均值大于所述第一平均阈值且小于所述第二平均阈值时,所述增益系数随所述像素亮度平均值变化的比例系数为:(1-gmax)/(g2-g1);其中g1为所述第一平均阈值,g2为所述第二平均阈值,g2>g1,gmax为所述最大增益系数,gmax>1;当所述像素亮度平均值大于等于所述第二平均阈值时,所述增益系数为1。
- 根据权利要求14所述的视频处理装置,其中当所述第一亮度阈值大于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /n);当所述第一亮度阈值小于等于所述最大亮度像素的亮度时,所述增益系数的范围为:1<k<(f /m);其中,k为所述增益系数,f为显示装置具有的最高亮度, m为所述最大亮度像素的亮度,n为所述第一亮度阈值。
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