CN105721844A - Method for enhancing image-quality contrast layering based on Gamma adjustment of liquid crystal display television - Google Patents

Method for enhancing image-quality contrast layering based on Gamma adjustment of liquid crystal display television Download PDF

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Publication number
CN105721844A
CN105721844A CN201610069377.1A CN201610069377A CN105721844A CN 105721844 A CN105721844 A CN 105721844A CN 201610069377 A CN201610069377 A CN 201610069377A CN 105721844 A CN105721844 A CN 105721844A
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gamma
chromaticity coordinates
brightness
gray scale
target gray
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CN105721844B (en
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赵之明
倪辉
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Sichuan Changhong Electric Co Ltd
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Sichuan Changhong Electric Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/68Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits
    • H04N9/69Circuits for processing colour signals for controlling the amplitude of colour signals, e.g. automatic chroma control circuits for modifying the colour signals by gamma correction

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Processing Of Color Television Signals (AREA)
  • Picture Signal Circuits (AREA)

Abstract

The invention discloses a method for enhancing the image-quality contrast layering based on Gamma adjustment of a liquid crystal display television. The method comprises the following steps of: firstly, determining the maximum brightness L<max> of the liquid crystal display television according with the chromaticity coordinate under Gamma requirements, then, determining 50% gray level according with 2.2 brightness curve requirements, determining the brightness L<50%> of the 50% gray level according with the chromaticity coordinate under Gamma requirements, then, calculating the target gray level brightness L<n> according with Gamma chromaticity coordinate requirements according to the target gray level number n adjusted to accord with the image-quality chromaticity coordinate of the liquid crystal display television, wherein different calculation manners are adopted in different gray level ranges; and finally, adjusting Gamma according to a calculation result, such that the Gamma accords with chromaticity coordinate requirements. According to the invention, fine adjustment in a Gamma adjustment process of the liquid crystal display television is utilized; the contrast of an image is enhanced by adjusting brightness of a Gamma curve in different gray levels; and, on the premise that the hardware cost of the liquid crystal display television is not increased, the purpose of improving the image quality of the liquid crystal display television is achieved.

Description

Method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted
Technical field
Embodiments of the present invention relate to LCD TV field, more specifically, embodiments of the present invention relate to a kind of method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted.
Background technology
Image level sense is a major criterion of liquid crystal television definition height, the general method improving image level sense mainly improves the contrast of the LCD screen that LCD TV adopts, this is typically required and is undertaken by the mode of raising liquid crystal display screen brightness, and this can improve the whole production cost of liquid crystal module.Therefore, how to be issued to, in the premise not improving LCD TV hardware cost, the purpose that improving liquid crystal television definition shows, be one of current key studied, there is presently no the relevant report achieving this purpose.
Summary of the invention
This patent technical problem to be solved, is how under the premise not increasing hardware cost, by could be adjusted to strengthen the contrast of image to the brightness of LCD TV gamma curve performance, promotes image quality performance.
For solving above-mentioned technical problem, one embodiment of the present invention by the following technical solutions:
A kind of method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, it comprises the following steps:
(1) the Gamma high-high brightness L requiring the LCD TV of lower chromaticity coordinates it is determined for compliance withmax
(2) according to LmaxIt is determined for compliance with 50% GTG of 2.2 brightness curve requirements, and determines that this 50% GTG meets Gamma and requires the brightness L of lower chromaticity coordinates50%
(3) according to meeting the required target gray scale number n regulated of liquid crystal television definition chromaticity coordinates, the target gray scale brightness L meeting Gamma chromaticity coordinates requirement is calculatedn, computational methods are as follows:
If 0%≤target gray scale number < 50%, its target gray scale brightness LnCalculation be:
L n = L 50 % &times; ( n 128 ) 2.4 ;
If 50%≤target gray scale number < 75%, its target gray scale brightness LnCalculation be:
L n = L m a x &times; ( n 256 ) ( 2.2 - n - 128 320 ) ;
If 75%≤target gray scale number≤100% GTG, its target gray scale brightness LnCalculation be:
L n = L m a x &times; ( n 256 ) ( 2.0 + n - 192 320 ) ;
(4) with LnThe adjustment Gamma that is as the criterion complies with chromaticity coordinates requirement.
In the above-mentioned method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, described LmaxDefining method be: to specify that the gamma curve that colour temperature T and chromaticity coordinates x, y require is sampled obtaining the sample point of most high-order GTG in advance, regulating the RGB numerical value of most high-order GTG so as to meet the requirement of gamma curve according to the requirement of chromaticity coordinates x, y, the brightness of TV display screen now is Lmax
In the above-mentioned method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, described L50%=0.52.2×Lmax
In the above-mentioned method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, the described required target gray scale that regulates of liquid crystal television definition chromaticity coordinates that meets is that all sample points are evenly distributed in whole piece gamma curve by gamma curve is sampled the GTG of multiple sample points obtained.According to different situations, whole piece gamma curve is sampled, for instance take 16 points, it is simply that regulate 0,15,31,47,63 respectively ... the rgb value of 207,223,239,255 these GTGs.
In the above-mentioned method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, the concrete operation method of described step (4) is: regulates the rgb value of all target gray scale according to each gray-scale intensity that step (1), (2) and (3) obtains by requirement as follows, makes the chromaticity coordinates of all target gray scale all meet claimed below:
1. increasing the numerical value of R, chromaticity coordinates x rises;
2. increasing the numerical value of G, chromaticity coordinates y rises;
3. increasing the numerical value of B, chromaticity coordinates x, y decline;
After adjustment completes, with sample point corresponding to the chromaticity coordinates of the smoothed curve each target gray scale of connection, namely obtain complete gamma curve.
Why different target ash exponent number calculates target gray scale brightness L according to above-mentioned different calculation to the present inventionn, it being because so making high-order luminance part in image seem brighter, low order luminance part is darker, with this contrast performance improving picture, strengthens image quality stereovision.
Compared with prior art, one of beneficial effects of the present invention is: the present invention utilizes the fine setting in LCD TV Gamma adjustment process, the contrast of image is strengthened by adjusting gamma curve brightness performance under different GTGs, under the premise not improving LCD TV hardware cost, reach the purpose of improving liquid crystal television definition performance.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Embodiment 1
Whole piece gamma curve is sampled, takes 19 points, i.e. 0,14,28,42,56,70,84,98,112,126,140,154,168,182,196,210,224,241,255 these GTGs.
The present embodiment is that example illustrates how that adjusting gamma curve realizes strengthening image quality contrast stereovision by adjusting 224 GTGs and 112 GTGs.
First the Gamma high-high brightness L requiring the LCD TV of lower chromaticity coordinates it is determined for compliance withmax: colour temperature T clear and definite in advance is 10500K, the requirement of opponent-color coordinates x, y is (0.279,0.283), according to the gamma curve that specify that T, x, y require, the RGB numerical value of most high-order GTG (255 rank) is regulated according to the requirement of chromaticity coordinates x, y, now this numerical value meets the requirement of gamma curve chromaticity coordinates, it is thus achieved that TV display screen brightness now and Lmax
According to LmaxIt is determined for compliance with 50% GTG of 2.2 brightness curve requirements, and determines that this 50% GTG meets Gamma and requires the brightness L of lower chromaticity coordinates50%
The target gray scale of the present embodiment adjustment is 224 rank, and it belongs to the grey-scale range of 75%≤target gray scale number≤100%, and (1) is calculated according to the following equation:
L n = L m a x &times; ( n 256 ) ( 2.0 + n - 192 320 ) ... ( 1 )
I.e. L224=0.7555Lmax
Obtain the brightness L on target gray scale 224 rank224
According to 224 gray-scale intensity L224The adjustment Gamma that is as the criterion complies with chromaticity coordinates requirement, and concrete method of adjustment is:
According to L obtained above224Regulate the rgb value of 224 GTGs by following requirement, make the chromaticity coordinates of 224 GTGs meet claimed below:
Increasing the numerical value of R, chromaticity coordinates x rises;
Increasing the numerical value of G, chromaticity coordinates y rises;
Increasing the numerical value of B, chromaticity coordinates x, y decline.
The next target gray scale to adjust is 112 rank, and it belongs to the grey-scale range of 0%≤target gray scale number < 50%, and (2) are calculated according to the following equation:
L n = L 50 % &times; ( n 128 ) 2.4 ... ( 2 )
I.e. L112=0.7258L50%
Obtain the brightness L on target gray scale 122 rank112
According to 112 gray-scale intensity L112The adjustment Gamma that is as the criterion complies with chromaticity coordinates requirement, and concrete method of adjustment is:
According to L obtained above112Regulate the rgb value of 112 GTGs by following requirement, make the chromaticity coordinates of 112 GTGs meet claimed below:
Increasing the numerical value of R, chromaticity coordinates x rises;
Increasing the numerical value of G, chromaticity coordinates y rises;
Increasing the numerical value of B, chromaticity coordinates x, y decline.
All the other 17 sampled GTGs out in the gamma curve of adjustment respectively as implied above, after having regulated, with sample point corresponding to the chromaticity coordinates of smoothed curve above-mentioned 19 GTGs of connection, namely obtain complete gamma curve.The present invention, by improving the contrast performance of picture, enhances the effect of image quality stereovision.
Although reference be made herein to invention has been described for the explanatory embodiment of the present invention, but, it should be understood that those skilled in the art can be designed that a lot of other amendments and embodiment, these amendments and embodiment will drop within spirit disclosed in the present application and spirit.More specifically, in scope disclosed in the present application, it is possible to building block and/or layout to theme composite configuration carry out multiple modification and improvement.Except the modification that building block and/or layout are carried out and improvement, to those skilled in the art, other purposes also will be apparent from.

Claims (5)

1. the method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, it is characterised in that it comprises the following steps:
(1) the Gamma high-high brightness L requiring the LCD TV of lower chromaticity coordinates it is determined for compliance withmax
(2) according to LmaxIt is determined for compliance with 50% GTG of 2.2 brightness curve requirements, and determines that this 50% GTG meets Gamma and requires the brightness L of lower chromaticity coordinates50%
(3) according to meeting the required target gray scale number n regulated of liquid crystal television definition chromaticity coordinates, the target gray scale brightness L meeting Gamma chromaticity coordinates requirement is calculatedn, computational methods are as follows:
If 0%≤target gray scale number < 50%, its target gray scale brightness LnCalculation be:
L n = L 50 % &times; ( n 128 ) 2.4 ;
If 50%≤target gray scale number < 75%, its target gray scale brightness LnCalculation be:
L n = L m a x &times; ( n 256 ) ( 2.2 - n - 128 320 ) ;
If 75%≤target gray scale number≤100% GTG, its target gray scale brightness LnCalculation be:
L n = L m a x &times; ( n 256 ) ( 2.0 + n - 192 320 ) ;
(4) with LnThe adjustment Gamma that is as the criterion complies with chromaticity coordinates requirement.
2. the method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted according to claim 1, it is characterised in that described LmaxDefining method be: to specify that the gamma curve that colour temperature T and chromaticity coordinates x, y require is sampled obtaining the sample point of most high-order GTG in advance, regulating the RGB numerical value of most high-order GTG so as to meet the requirement of gamma curve according to the requirement of chromaticity coordinates x, y, the brightness of TV display screen now is Lmax
3. the method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted according to claim 1, it is characterised in that described L50%=0.52.2×Lmax
4. the method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted according to claim 1, the target gray scale meeting the required adjustment of liquid crystal television definition chromaticity coordinates described in it is characterized in that is the GTG of the multiple sample points by gamma curve is sampled acquisition, and all sample points are evenly distributed in whole piece gamma curve.
5. the method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted according to claim 1, it is characterized in that the concrete operation method of described step (4) is: regulate the rgb value of all target gray scale according to each gray-scale intensity that step (1), (2) and (3) obtains by requirement as follows, make the chromaticity coordinates of all target gray scale all meet claimed below:
1. increasing the numerical value of R, chromaticity coordinates x rises;
2. increasing the numerical value of G, chromaticity coordinates y rises;
3. increasing the numerical value of B, chromaticity coordinates x, y decline;
After adjustment completes, with sample point corresponding to the chromaticity coordinates of the smoothed curve each target gray scale of connection, namely obtain complete gamma curve.
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WO2018176523A1 (en) * 2017-03-27 2018-10-04 武汉华星光电技术有限公司 Brightness adjustment method and apparatus for rgbw liquid crystal display apparatus
CN109637475A (en) * 2018-12-21 2019-04-16 惠科股份有限公司 gamma debugging method of display panel
CN109688464A (en) * 2019-03-21 2019-04-26 湖南快乐阳光互动娱乐传媒有限公司 Video image enhancement processing method and processing system and player terminal
CN113727489A (en) * 2021-11-01 2021-11-30 广州市浩洋电子股份有限公司 Method and system for adjusting brightness, storage medium, lamp and lighting system
WO2022017266A1 (en) * 2020-07-20 2022-01-27 深圳光峰科技股份有限公司 Display method and related apparatus therefor
CN114222101A (en) * 2021-12-24 2022-03-22 杭州海康威视数字技术股份有限公司 White balance adjusting method and device and electronic equipment

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CN109413418A (en) * 2018-12-19 2019-03-01 四川长虹电器股份有限公司 Inhibit the gamma adjustment method of LCD TV efficiency loss

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CN109637475A (en) * 2018-12-21 2019-04-16 惠科股份有限公司 gamma debugging method of display panel
CN109688464A (en) * 2019-03-21 2019-04-26 湖南快乐阳光互动娱乐传媒有限公司 Video image enhancement processing method and processing system and player terminal
WO2022017266A1 (en) * 2020-07-20 2022-01-27 深圳光峰科技股份有限公司 Display method and related apparatus therefor
CN113727489A (en) * 2021-11-01 2021-11-30 广州市浩洋电子股份有限公司 Method and system for adjusting brightness, storage medium, lamp and lighting system
CN114222101A (en) * 2021-12-24 2022-03-22 杭州海康威视数字技术股份有限公司 White balance adjusting method and device and electronic equipment
CN114222101B (en) * 2021-12-24 2023-10-10 杭州海康威视数字技术股份有限公司 White balance adjusting method and device and electronic equipment

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