CN104599650A - Intelligent de-Mura modulation method without losing video image brightness - Google Patents

Abstract

The invention provides an intelligent de-Mura modulation method without losing video image brightness. The intelligent de-Mura modulation method includes the steps of: 1, in each display unit P, dissolving the brightness values RP, GP and BP of a video signal respectively, and thereby obtaining the de-Mura brightness values Rdemura, Gdemura and Bdemura of the display unit P after being subjected to de-Mura modulation; 2, measuring a viewing distance from an audience to a liquid crystal display, when the plurality of audiences exist in an audience image, selecting the audience with the nearest distance as a leading audience, and detecting the distance from the leading audience to the liquid crystal display; 3, regulating the degree of de-Mura according to the measured viewing distance of the audience, when the audience is close to the liquid crystal display, increasing the degree of de-Mura to improve the coherence of the image, and when the audience is far away from the display, reducing the degree of de-Mura to reduce the loss of the image brightness; 4, displaying the regulated de-Mura output result to achieve the effect that the coherence of the image brightness and the image brightness both accord with the visual requirement of the audience.

Description

A kind of intelligent de-mura modulator approach of not losing image frame brightness

Technical field

The present invention relates to display screen technology field, more specifically, relate to a kind of intelligent de-mura modulator approach of not losing image frame brightness.

Background technology

Mura (moire) refers to the phenomenon of the various pollution patches that brightness of display screen is uneven and produce, and its Crack cause may be the display flaw that LCD attaches color screen introducing, also may be introduce in the manufacture process of liquid crystal display own.The existence of Mura makes display screen at show image, and during the image of especially large area smooth region, display results abnormity, picture brightness is uneven, reduces the viewing comfort level of spectators.De-mura is exactly under the prerequisite of the information such as position and mura degree in known mura region, corresponding intensification modulation is carried out to the signal of video signal be input in liquid crystal display zones of different, to improve the consistance of image output picture brightness, promote the viewing experience of spectators.De-mura modulator approach disclosed in Chinese invention patent application numbers 201310695713 is as follows:

1, input the complete white image of a n (n=0 ~ 255) GTG, the luminance data matrix of its correspondence is Input;

2, obtain LCD screen showing the second complete white image obtained by imaging brightness meter, corresponding luminance data matrix is Output;

3, brightness correction matrix of coefficients Table_n=Output./Input, wherein ' ./' be matrix operation symbol, represent that the corresponding element of two matrixes is divided by.

So just obtain the look-up table of all display units under all GTGs.

But the above-mentioned gray modulation of de-mura technology to signal of video signal is fixing, so the signal of video signal luminance loss caused while eliminating Mura is also constant, reduce the viewing experience of spectators.

Summary of the invention

The present invention is directed to the technical matters existed in above-mentioned prior art, a kind of intelligent de-mura modulator approach of not losing image frame brightness is provided, ensures the brightness uniformity that the image frame that spectators watch has had, and there is high brightness value.

For achieving the above object, the technical solution adopted in the present invention is as follows:

Do not lose an intelligent de-mura modulator approach for image frame brightness, comprise step as follows:

1), at each display unit, to the brightness value R of signal of video signal _p, G _p, B _pvalue solves respectively, obtains the de-mura brightness value R after the de-mura modulation of display unit P _demura, G _demura, B _demura;

2), detect spectators to the viewing distance distance of liquid crystal display, when there are multiple spectators in spectators' image, the nearest spectators of selected distance, as leading spectators, detect and dominate the distance of spectators to liquid crystal display;

3) based on the spectators' viewing distance distance detected, the degree of adjustment de-mura, when spectators are close to liquid crystal display, strengthens de-mura degree, improves picture uniformity; When spectators are away from display screen, reduce de-mura degree, reduce the loss of picture brightness;

4) the de-mura Output rusults after adjustment is shown, obtain the effect that picture brightness consistance and picture brightness meet spectators' vision requirement.

Described step 1) implementation be realized by look-up table process:

R _demura＝Table _P，R(R _P)；

G _demura＝Table _P，G(G _P)；

B _demura＝Table _P，B(B _P)；

Wherein, Table _{p, R}, Table _{p, G}, Table _{p, B}the look-up table of the R/G/B component of display unit P respectively.

The look-up table of different display units is identical or different.

Described step 2) in, use camera or external camera that liquid crystal display carries, detect the viewing distance distance of spectators to liquid crystal display.

Described step 2) in, detection spectators to the implementation method of the viewing distance distance of liquid crystal display are:

2.1) use two cameras, obtain spectators' image;

2.2) analyze spectators' image, calculate the parallax of spectators' face on image;

2.3) based on parallax and camera parameter, the viewing distance distance of spectators to liquid crystal display is calculated:

$\mathrm{dis}\tan \mathrm{ce}=\frac{B\×F}{\mathrm{Disparity}}+F$

Wherein B, F represent parallax range and the focal length of two cameras respectively.

Described step 3) in, according to the spectators' viewing distance distance detected, the method for the degree of adjustment de-mura is: when spectators are close to liquid crystal display, strengthens de-mura degree, makes picture uniformity better; When spectators are away from display screen, reduce de-mura degree, reduce the loss of picture brightness.

De-mura after display unit P adjusts exports and is:

$R_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×R_{\mathrm{demura}}$

$G_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×G_{\mathrm{demura}}$

$B_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×B_{\mathrm{demura}}$

Wherein Default _distancethe viewing ratio that system pre-sets.

The intelligent de-mura modulator approach of not losing image frame brightness that the present invention proposes, guarantees the viewing experience that spectators can obtain under varying environment.

Accompanying drawing explanation

By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:

Fig. 1 is the process flow diagram of method provided by the present invention.

Embodiment

Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.

Intelligent de-mura modulator approach of not losing image frame brightness provided by the present invention, main contents are as follows:

First, analyze image frame brightness uniformity and the impact of image frame brightness size in viewing experience, and then determine the priority of these two kinds of factors in spectators' viewing process.When spectators are close to display screen, easily notice the inconsistent of picture brightness, the impact of mura is large; When spectators are away from liquid crystal display, the loss of brightness more easily affects display image quality, reduces the viewing experience of spectators.So in the modulated process of display screen input signal, when spectators are close to liquid crystal display, the priority keeping image frame display brightness consistent is high; When spectators are away from display screen, the priority reducing luminance loss is high.

Based on above-mentioned analysis, what the present invention proposed a kind ofly meets intelligent de-mura modulator approach between spectators' vision in picture brightness consistance and picture brightness, and detailed process is as follows:

1), at each display unit, to the brightness value R of signal of video signal _p, G _p, B _pvalue solves respectively, obtains the de-mura brightness value R after the de-mura modulation of display unit P _demura, G _demura, B _demura.

Above-mentioned a kind of implementation is realized by look-up table process:

R _demura＝Table _P，R(R _P)；

G _demura＝Table _P，G(G _P)；

B _demura＝Table _P，B(G _B)；

Wherein, Table _{p, R}, Table _{p, G}, Table _{p, B}the look-up table of the R/G/B component of display unit P respectively.Different display unit look-up tables can be identical or different.

2) use the camera that liquid crystal display carries or external camera or other sensing apparatus, detect the viewing distance of spectators to liquid crystal display.

Above-mentioned a kind of implementation method is:

2.1), use two cameras, obtain spectators' image;

2.2), analyze spectators' image, calculate the parallax disparity of spectators' face on image by a kind of Stereo matching (stereo matching) algorithm.The consideration detected by face is the integrality of face in spectators' image and the maturity of Face datection recognition technology.Stereo Matching Algorithm can adopt prior art, such as, in Chinese invention patent 200980147216 disclosed algorithm.

2.3), based on parallax and camera parameter, the distance distance of spectators to liquid crystal display is calculated:

$\mathrm{dis}\tan \mathrm{ce}=\frac{B\×F}{\mathrm{Disparity}}+F$

Wherein B, F represent parallax range and the focal length of two cameras respectively.

According to 2.2), when there are multiple spectators in spectators' image, the nearest spectators of selected distance, as leading spectators, detect the distance of leading spectators to liquid crystal display.

2.4), based on 2.2) spectators' viewing distance distance of detecting, the degree of adjustment de-mura.When spectators are close to liquid crystal display, strengthen de-mura degree, make picture uniformity better; When spectators are away from display screen, reduce de-mura degree, reduce the loss of picture brightness.De-mura after a kind of display unit P adjustment of implementation method exports and is:

$R_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×R_{\mathrm{demura}}$

$G_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×G_{\mathrm{demura}}$

$B_{{\mathrm{demura}}_{\mathrm{demura}}}^{\text{'}}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×B_{\mathrm{demura}}$

Wherein Default _distancethe viewing ratio that system pre-sets.

2.5), by 2.4) adjustment after de-mura Output rusults show, the brightness uniformity that the image frame that spectators watch has had can be ensured, and there is high brightness value.

Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.

Claims (7)

1. do not lose an intelligent de-mura modulator approach for image frame brightness, it is characterized in that, comprise step as follows:

1), at each display unit P, to the brightness value B of signal of video signal _p, G _p, B _pvalue solves respectively, obtains the de-mura brightness value R after the de-mura modulation of display unit P _demura, G _demura, B _demura;

2), detect spectators to the viewing distance distance of liquid crystal display, when there are multiple spectators in spectators' image, the nearest spectators of selected distance, as leading spectators, detect and dominate the distance of spectators to liquid crystal display;

3) based on the spectators' viewing distance distance detected, the degree of adjustment de-mura, when spectators are close to liquid crystal display, strengthens de-mura degree, improves picture uniformity; When spectators are away from display screen, reduce de-mura degree, reduce the loss of picture brightness;

4) the de-mura Output rusults after adjustment is shown, obtain the effect that picture brightness consistance and picture brightness meet spectators' vision requirement.

2. intelligent de-mura modulator approach of not losing image frame brightness according to claim 1, is characterized in that, described step 1) implementation be realized by look-up table process:

R _demura＝Table _P，R(R _P)；

G _demura＝Table _P，G(G _P)

D _demura＝Table _P，B(B _P)；

Wherein, Table _{p, R}, Table _{p, G}, Table _{p, B}the look-up table of the R/G/B component of display unit P respectively.

3. intelligent de-mura modulator approach of not losing image frame brightness according to claim 2, it is characterized in that, the look-up table of different display units is identical or different.

4. intelligent de-mura modulator approach of not losing image frame brightness according to claim 1, it is characterized in that, described step 2) in, use camera or external camera that liquid crystal display carries, detect the viewing distance distance of spectators to liquid crystal display.

5. intelligent de-mura modulator approach of not losing image frame brightness according to claim 4, is characterized in that, described step 2) in, detection spectators to the implementation method of the viewing distance distance of liquid crystal display are:

2.1) use two cameras, obtain spectators' image;

2.2) analyze spectators' image, calculate the parallax of spectators' face on image;

2.3) based on parallax and camera parameter, the viewing distance distance of spectators to liquid crystal display is calculated:

$\mathrm{dis}\tan \mathrm{ce}=\frac{B\×F}{\mathrm{Disparity}}+F$

Wherein B, F represent parallax range and the focal length of two cameras respectively, and disparity represents the parallax of spectators' face on image.

6. intelligent de-mura modulator approach of not losing image frame brightness according to claim 1, it is characterized in that, described step 3) in, according to the spectators' viewing distance distance detected, the method of the degree of adjustment de-mura is: when spectators are close to liquid crystal display, strengthen de-mura degree, make picture uniformity better; When spectators are away from display screen, reduce de-mura degree, reduce the loss of picture brightness.

7. intelligent de-mura modulator approach of not losing image frame brightness according to claim 6, is characterized in that, the de-mura after display unit P adjusts exports and is:

$R_{{\mathrm{demura}}_{\mathrm{demura}}}^{\′}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×R_{\mathrm{demura}}$

$G_{{\mathrm{demura}}_{\mathrm{demura}}}^{\′}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×G_{\mathrm{demura}}$

$B_{{\mathrm{demura}}_{\mathrm{demura}}}^{\′}=\frac{{\mathrm{Default}}_{\mathrm{dis}\tan \mathrm{ce}}}{\mathrm{dis}\tan \mathrm{ce}}\×B_{\mathrm{demura}}$

Wherein Default _distancethe viewing ratio that system pre-sets.