CN1971696A - Method for controlling brightness of image subarea - Google Patents
Method for controlling brightness of image subarea Download PDFInfo
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- CN1971696A CN1971696A CN 200610160984 CN200610160984A CN1971696A CN 1971696 A CN1971696 A CN 1971696A CN 200610160984 CN200610160984 CN 200610160984 CN 200610160984 A CN200610160984 A CN 200610160984A CN 1971696 A CN1971696 A CN 1971696A
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Abstract
The invention discloses a controlling method for the image partition brightness. Firstly inputs a display image; then the display image is divided into several blocks and the average brightness of every block is calculated, control the related block brightness according to the average brightness of every block, build an enquiry form to store several chromatic value and several weighted chromatic value, the form is built in the display, the brightness of every block could be controlled according to the form; the invention also can be used to control the brightness of light-emitting diode in a backlight module.
Description
Technical field
The present invention relates to a kind of brightness control method, relate in particular to a kind of method for controlling brightness of image subarea, be used to control the brightness of the shown image of a LCD.
Background technology
The contrast of LCD is the key factor of show image quality at present.Yet, import a black background image to this LCD, and this LCD causes this black background image of this liquid crystal display displays dark inadequately because light leaks problem.In general, the contrast of this LCD TV is about 10
3, but relatively still have deficiency with the contrast of traditional C RT or PDP TV.
In order to improve the problem of contrast deficiency, one high dynamic contrast liquid crystal display systems (HighDynamic Contrast LCD System) is proposed, this system utilizes the backlight module of tool light emitting diode to promote this contrast, makes the contrast of this LCD surpass 10
4Based on cost and mass-produced consideration, the image that this LCD is shown is divided into m block of n x, the brightness of each block can independently be controlled, a kind of simple mode can determine the brightness of each block, average brightness by each block, the account form of the average brightness of each block is got the maximum colours value of a plurality of pixels of each block earlier, add up a plurality of maximum colours values of each block divided by the contained number of pixels of each block, promptly obtain the average brightness of each block, the equation of this average brightness is as follows:
Wherein, (R, G B) are the maximum colours value of each pixel to this max, and this n is the contained number of pixels of each block.
Though said method can make this backlight module tool stability, also is not subjected to other noise, this backlight module can't show the details of dark pattern, causes the display quality of this LCD to reduce.So those skilled in the art can't meet user required when reality is used.
Therefore, a kind of method for controlling brightness of image subarea of novelty is proposed at the problems referred to above, not only can improve liquid crystal and can't show the secretly details shortcoming of pattern by display, can promote the contrast of the shown image of this LCD again, be used to control the light-emitting diode luminance of this backlight module, can make this backlight module tool stability, and not be subjected to other interference of noise.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of method for controlling brightness of image subarea, and it promotes the shown image contrast of a LCD.
Another object of the present invention is to provide a kind of method for controlling brightness of image subarea, its promote this liquid crystal display displays than shadow as the time quality.
A further object of the present invention is to provide a kind of method for controlling brightness of image subarea, and the light-emitting diode luminance that it can be used for controlling a backlight module makes this backlight module tool stability, is not subject to other noise.
Another purpose of the present invention is to provide a kind of method for controlling brightness of image subarea, further set up a question blank (Lookup table, LUT), can calculate the average brightness of each block fast according to this question blank, have the complex calculations process of simplifying, reduce operation time and accelerate the effect of subregion brilliance control processing speed.
For achieving the above object, the invention provides a kind of method for controlling brightness of image subarea, this method is input one show image earlier, then dividing this show image is a plurality of blocks, each block of these a plurality of blocks has a plurality of pixels, the maximum colours value of each pixel is made a ranking operation, promptly obtain a weighting color-values of each pixel, a plurality of weighting color-values of each block add up again divided by this number of pixels, obtain an average brightness of each block, control the brightness of corresponding block again by this average brightness.
According to these a plurality of maximum colours values and corresponding a plurality of weighting color-values, set up a question blank, this question blank stores a plurality of color-values and corresponding a plurality of weighting color-values, this question blank builds in this LCD, and this LCD is carried out brilliance control according to this question blank to each block of this show image.
Adopt method for controlling brightness of image subarea of the present invention can promote the contrast of the shown image of this LCD, improve the quality of this liquid crystal display displays than the shadow picture, and can be used for controlling the light-emitting diode luminance of this backlight module, promoting this backlight module stability not disturbed by other noise (noise), and the present invention further sets up this question blank, can calculate the average brightness of each block fast according to this question blank, have the complex calculations process of simplifying, reduce operation time and accelerate the effect of subregion brilliance control processing speed.
Description of drawings
Fig. 1 is a basic procedure synoptic diagram of the present invention;
Fig. 2 is the question blank synoptic diagram of a preferred embodiment of the present invention:
Fig. 3 is the graph of a relation of the color-values and the weighting color-values of another preferred embodiment of the present invention; And
Fig. 4 is the schematic flow sheet of another preferred embodiment of the present invention.
Wherein, Reference numeral:
Color-values 1
Color-values 1a
Color-values 1b
Color-values 1c
Weighting color-values 2
Weighting color-values 2a
Weighting color-values 2b
Weighting color-values 2c
Relation curve 3
Embodiment
Further understand and understanding for your juror is had architectural feature of the present invention and the effect reached, careful with preferred embodiment and cooperate detailed explanation, illustrate as after:
Consult Fig. 1, be basic procedure synoptic diagram of the present invention.As shown in the figure: the present invention is a kind of method for controlling brightness of image subarea, execution in step S10 at first, import show image to a LCD, follow execution in step S11, dividing this show image is a plurality of blocks, execution in step S12 again, each block of these a plurality of blocks has a plurality of pixels, each pixel of these a plurality of pixels has a maximum colours value, and the maximum colours value of each pixel made a ranking operation, finger is with the maximum colours value of each pixel and weighting coefficient product mutually, and this weighting coefficient can be a multiple, one power side or calculate according to this backlight liquid crystal display brightness and LCD penetration, via above-mentioned ranking operation, promptly obtain a weighting color-values of each pixel, execution in step S13 again, add up a plurality of weighting color-values of each block divided by the contained number of pixels of each block, obtain an average brightness of each block, at last control the brightness of corresponding block, and it is as follows to calculate the equation of average brightness of each block according to the average brightness of each block:
Wherein, this max (R, G B) are the maximum colours value of each pixel, and this f is a weighting coefficient, and this f[max (R, G, B)] make the weighting color-values of ranking operation gained for the maximum colours value of each pixel, and this n is the contained number of pixels of each block.
According to step S12, dividing this show image is a plurality of blocks, each block of these a plurality of blocks comprises a plurality of pixels, the scope of the color-values of this each pixel is between 0 to 255, and comprise a red value (R), one green value (G) and a blue valve (B), the red value that color-values comprised according to this pixel, green value and blue valve are got a maximal value, be the maximum colours value of this pixel, as: the color-values of this pixel comprises red value, green value and blue valve, this red value is 216, this green value is 134, reaching this blue valve is 18, so the maximum colours value of this pixel is 216, can be obtained the maximum colours value of each pixel by said method, execution in step S12 and S13 again, and then obtain the average brightness of each block.
Consult Fig. 2, after carrying out above-mentioned steps S11 to S13, according to these a plurality of maximum colours values and corresponding a plurality of weighting color-values, set up a question blank, this question blank comprises a plurality of color-values 1 and corresponding a plurality of weighting color-values 2, as shown in Figure 2, question blank synoptic diagram for a preferred embodiment of the present invention, this question blank comprises a plurality of color-values 1 and corresponding a plurality of weighting color-values 2, as: when this color-values 1a was 1, this weighting color-values 2a was 2; When this color-values 1b was 2, this weighting color-values 2b was 4; And when this color-values 1c is 255, this weighting color-values 2c is 510, the scope of above-mentioned color-values 1 is between 0 to 255, be this color-values 1 and this weighting coefficient product mutually in addition according to this weighting color-values 2, use a multiple so extrapolate the weighting coefficient of present embodiment, this multiple is 2, and this weighting coefficient also can be a power side or calculate according to this backlight liquid crystal display brightness and LCD penetration.
After setting up this question blank, this question blank builds in this LCD, when input during one image, can calculate the average brightness of each block that oneself divides this image of a plurality of blocks according to this question blank, and control the brightness of corresponding block according to the average brightness of each block.
Consult Fig. 3, be the graph of a relation of the color-values and the weighting color-values of another preferred embodiment of the present invention.As shown in the figure: comprise a relation curve 3 in the graph of a relation of this color-values and weighting color-values, by this relation curve 3 as can be known the scope of this color-values between 0 to 255, and this weighting color-values last weighting coefficient on duty that is this maximum colours, therefore can extrapolate this weighting coefficient by this relation curve 3, but this weighting coefficient is not a multiple, promptly may be a power side or calculates according to this backlight liquid crystal display brightness and LCD penetration.Set up this question blank according to this relation curve 3, when the shown image of this LCD being carried out brilliance control in the future, promptly can calculate the average brightness of each block of this image, and then reach the purpose of subregion brilliance control according to this question blank.
Fig. 4 is the schematic flow sheet of another preferred embodiment of the present invention.As shown in the figure: the execution in step S20 of method for controlling brightness of image subarea elder generation of present embodiment, import show image to a LCD, follow execution in step S21, dividing this show image is a plurality of blocks, this each block has a plurality of pixels, execution in step S22 again, obtain the maximum colours value of each pixel, input to the question blank of a plurality of weighting color-values of a plurality of color-values of storage and correspondence, find out corresponding weighting color-values, after finding out a plurality of weighting color-values of each block, execution in step S23, add up a plurality of weighting color-values of each block divided by the contained number of pixels of each block, promptly obtain an average brightness of each block, utilize this average brightness to control the brightness of corresponding block again.Present embodiment calculates the average brightness of each block according to this question blank, so can simplify the complex calculations process, reduces operation time and accelerates subregion brilliance control processing speed.
From the above, method for controlling brightness of image subarea of the present invention can promote the contrast of the shown image of this LCD, improve the quality of this liquid crystal display displays than the shadow picture, and can be used for controlling the light-emitting diode luminance of this backlight module, promoting this backlight module stability not disturbed by other noise (noise), and the present invention further sets up this question blank, can calculate the average brightness of each block fast according to this question blank, have the complex calculations process of simplifying, reduce operation time and accelerate the effect of subregion brilliance control processing speed.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; being familiar with those of ordinary skill in the art ought can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (23)
1. a method for controlling brightness of image subarea is characterized in that, comprises:
Import an image;
Dividing this image is a plurality of blocks;
Each block of these a plurality of blocks has a plurality of pixels, and the maximum colours value of each pixel is made a ranking operation, obtains a weighting color-values of each pixel; And
Add up a plurality of weighting color-values of each block divided by the contained number of pixels of each block, obtain an average brightness of each block.
2. method for controlling brightness of image subarea according to claim 1 is characterized in that, the color-values of this pixel comprises a red value, a green value and a blue valve.
3. method for controlling brightness of image subarea according to claim 1 is characterized in that, this maximum colours value is got the maximal value in the color-values of this pixel.
4. method for controlling brightness of image subarea according to claim 3 is characterized in that the scope of this maximum colours value is between 0 to 255.
5. method for controlling brightness of image subarea according to claim 1 is characterized in that, the maximum colours value of each pixel is made this ranking operation with the maximum colours of each a pixel last weighting coefficient on duty.
6. method for controlling brightness of image subarea according to claim 5 is characterized in that, this weighting coefficient is a multiple.
7. method for controlling brightness of image subarea according to claim 5 is characterized in that, this weighting coefficient is a power side.
8. method for controlling brightness of image subarea according to claim 5 is characterized in that, this weighting coefficient calculates according to this backlight liquid crystal display brightness and LCD penetration.
9. method for controlling brightness of image subarea according to claim 1, it is characterized in that, further set up a question blank according to these a plurality of maximum colours values and a corresponding secondary color weighting color-values, this question blank stores a plurality of color-values and corresponding a plurality of weighting color-values.
10. method for controlling brightness of image subarea according to claim 9 is characterized in that the scope of this color-values is between 0 to 255.
11. method for controlling brightness of image subarea according to claim 9 is characterized in that, this color-values of this weighting color-values correspondence and this weighting coefficient be product mutually.
12. method for controlling brightness of image subarea according to claim 9 is characterized in that, this question blank builds in the LCD, and this LCD is carried out brilliance control according to this question blank to each block of this image.
13. method for controlling brightness of image subarea according to claim 1 is characterized in that, is further used for controlling the brightness of the light emitting diode of a backlight module.
14. a method for controlling brightness of image subarea is characterized in that, comprises:
Import an image;
Dividing this image is a plurality of blocks; Each block of these a plurality of blocks has a plurality of pixels, and the maximum colours value of each pixel is imported a question blank, finds out corresponding weighting color-values; And
Add up a plurality of weighting color-values of each block divided by the contained number of pixels of each block, obtain an average brightness of each block.
15. method for controlling brightness of image subarea according to claim 14 is characterized in that, the color-values of this pixel comprises a red value, a green value and a blue valve.
16. method for controlling brightness of image subarea according to claim 14 is characterized in that, this maximum colours value is got the maximal value in the color-values of this pixel.
17. method for controlling brightness of image subarea according to claim 16 is characterized in that, the scope of this maximum colours value is between 0 to 255.
18. method for controlling brightness of image subarea according to claim 14 is characterized in that, this question blank stores a plurality of color-values and corresponding a plurality of weighting color-values.
19. method for controlling brightness of image subarea according to claim 14 is characterized in that, the scope of this color-values is between 0 to 255.
20. method for controlling brightness of image subarea according to claim 14 is characterized in that, this color-values of this weighting color-values correspondence and a weighting coefficient be product mutually.
21. method for controlling brightness of image subarea according to claim 20 is characterized in that, this weighting coefficient is a multiple.
22. method for controlling brightness of image subarea according to claim 20 is characterized in that, this weighting coefficient is a power side.
23. method for controlling brightness of image subarea according to claim 20 is characterized in that, this weighting coefficient calculates according to this backlight liquid crystal display brightness and LCD penetration.
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| CN101325038B (en) * | 2007-06-15 | 2010-05-26 | 群康科技(深圳)有限公司 | LCD and driving method thereof |
| CN101399023B (en) * | 2007-09-26 | 2011-06-29 | 奇景光电股份有限公司 | Method of controlling backlight module, backlight controller and display device using the same |
| CN101546541B (en) * | 2009-02-19 | 2011-07-27 | 华映光电股份有限公司 | Backlight control method used for liquid crystal panel and relevant liquid crystal display device |
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- 2006-12-11 CN CNB2006101609845A patent/CN100461247C/en not_active Expired - Fee Related
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| CN101399023B (en) * | 2007-09-26 | 2011-06-29 | 奇景光电股份有限公司 | Method of controlling backlight module, backlight controller and display device using the same |
| CN101546541B (en) * | 2009-02-19 | 2011-07-27 | 华映光电股份有限公司 | Backlight control method used for liquid crystal panel and relevant liquid crystal display device |
| CN104616625A (en) * | 2009-05-20 | 2015-05-13 | 马维尔国际贸易有限公司 | Liquid crystal display backlight control |
| CN104616625B (en) * | 2009-05-20 | 2017-06-13 | 马维尔国际贸易有限公司 | LCD backlight is controlled |
| CN102237047A (en) * | 2011-08-09 | 2011-11-09 | 旭曜科技股份有限公司 | Approximation method and device using backlight diffusion in backlight local dimming system |
| CN102237047B (en) * | 2011-08-09 | 2013-05-29 | 旭曜科技股份有限公司 | Approximation method and device using backlight diffusion in backlight local control system |
| CN106057134A (en) * | 2016-05-25 | 2016-10-26 | 武汉华星光电技术有限公司 | Liquid crystal display backlight control method, liquid crystal display backlight control device and liquid crystal display |
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| CN108462862B (en) * | 2017-02-22 | 2020-09-29 | 联咏科技股份有限公司 | Method and device for color space conversion of input image |
| CN109817170A (en) * | 2017-11-21 | 2019-05-28 | 华为技术有限公司 | Pixel compensation method, device and terminal device |
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