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

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 with_max；

(2) according to L_maxIt 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 coordinates_50%；

(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 calculated_n, computational methods are as follows:

If 0%≤target gray scale number < 50%, its target gray scale brightness L_nCalculation be:

$L_n=L_{50\%}\&times;{\left(\frac{n}{128}\right)}^{2.4};$

If 50%≤target gray scale number < 75%, its target gray scale brightness L_nCalculation be:

$L_n=L_{max}\&times;{\left(\frac{n}{256}\right)}^{(2.2-\frac{n-128}{320})};$

If 75%≤target gray scale number≤100% GTG, its target gray scale brightness L_nCalculation be:

$L_n=L_{max}\&times;{\left(\frac{n}{256}\right)}^{(2.0+\frac{n-192}{320})};$

(4) with L_nThe 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 L_maxDefining 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 L_max。

In the above-mentioned method based on the LCD TV Gamma enhancing image quality contrast stereovision adjusted, described L_50%=0.5^2.2×L_max。

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 invention_n, 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 with_max: 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 L_max。

According to L_maxIt 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 coordinates_50%

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:

$L_n=L_{max}\&times;{\left(\frac{n}{256}\right)}^{(2.0+\frac{n-192}{320})}\mathrm{...}\left(1\right)$

I.e. L₂₂₄=0.7555L_max；

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:

$L_n=L_{50\%}\&times;{\left(\frac{n}{128}\right)}^{2.4}\mathrm{...}\left(2\right)$

I.e. L₁₁₂=0.7258L_50%；

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 with_max；

(2) according to L_maxIt 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 coordinates_50%；

(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 calculated_n, computational methods are as follows:

If 0%≤target gray scale number < 50%, its target gray scale brightness L_nCalculation be:

$L_n=L_{50\%}\&times;{\left(\frac{n}{128}\right)}^{2.4};$

If 50%≤target gray scale number < 75%, its target gray scale brightness L_nCalculation be:

$L_n=L_{max}\&times;{\left(\frac{n}{256}\right)}^{(2.2-\frac{n-128}{320})};$

If 75%≤target gray scale number≤100% GTG, its target gray scale brightness L_nCalculation be:

$L_n=L_{max}\&times;{\left(\frac{n}{256}\right)}^{(2.0+\frac{n-192}{320})};$

(4) with L_nThe 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 L_maxDefining 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 L_max。

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 L_50%=0.5^2.2×L_max。

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.