CN100479494C - Adjusting method for the image quality - Google Patents
Adjusting method for the image quality Download PDFInfo
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- CN100479494C CN100479494C CNB2006100342536A CN200610034253A CN100479494C CN 100479494 C CN100479494 C CN 100479494C CN B2006100342536 A CNB2006100342536 A CN B2006100342536A CN 200610034253 A CN200610034253 A CN 200610034253A CN 100479494 C CN100479494 C CN 100479494C
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Abstract
The invention is an image quality regulating method, detecting and calculating the brightness accumulated value of all effective pixel points on a functional hardware platform of detecting the whole image brightness, and calculating the whole brightness of image signals according to the brightness accumulated value, and determining a target brightness value and then regulating brightness value and simultaneously compensating image contrast. And the method can real-timely regulate the brightness according to the dynamic change of the displayed image brightness, and besides, correspondingly regulate the image contrast, thus enriching expression of grey levels and color levels and making the display image have high-contrast effect.
Description
Technical field
The present invention relates to the image picture quality adjustment technology of video equipment, relate in particular to the image brightness of realization TV dynamic image and the dynamic real-time of contrast and follow the tracks of adjustment technology.
Background technology
Along with making rapid progress of TV tech development, the various technology of handling at image quality also continue to bring out, for example conventional black level extends, blue level extends, SVM handles, for the TV that adopts digital processing chip, flesh correction that noise reduction process at the image noise is more arranged, improves at color or the like.These processing modes have all played very big effect to improving of image quality, for the user provides the picture effect of high-quality more.Yet, unsatisfactory part is still arranged when adopting above-mentioned image quality processing mode to carry out the adjusting of picture, for example: the picture that lacks unity and coherence for those whole shinny or whiting, prior art only makes to occur after the brightness adjustment phenomenon of total painting surface layer time fuzzy, the gray-level performance and the gradation performance that are image are not ideal enough, in addition, in case so set, the image of all demonstrations later on all can be done same processing, and such adjustment is not to put things right once and for all for the television image of dynamic change yet.
In order to solve the above problems, open on November 9th, 2005, application number is CN200510020238.1, and the patent documentation that name is called " television image dynamic depth lifting method " has disclosed a kind of method of dynamic adjustments, makes television image have good depth of field performance all the time.Yet, this method implementation process needs " monochrome information of statistics input picture each pixel in determining scope; described monochrome information comprises number of pixels and the average brightness that is in each brightness signal value ", this hardware that just needs to be supported has the comparison strong functions, and the statistical information amount is huge, concerning TV, to realize the number of pixels statistics of each brightness signal value, must be on the existing hardware framework, add special-purpose Arithmetic Processing Chip (strengthening chip) such as some special-purpose image quality, thus bigger increase television cost.Will add on existing type that in addition its function will change hardware circuit again, the cycle is longer, has brought the rising of fringe cost simultaneously.In sum, this is a kind of by increasing the function that special-purpose extra process chip is realized.Implementation is a kind of hardware mode.Brought the remarkable increase of cost, popularizing on existing type also has certain degree of difficulty in addition.。
Summary of the invention
The objective of the invention is to based on the existing hardware platform, provide a kind of TV image quality adjustment method by software mode, brighter and the very bright picture at integral body, by brightness settings being carried out dynamic reduction in various degree, corresponding compensation and the extension of making contrast simultaneously allows image quality have good expressive force at any time.
Another object of the present invention is to provide a kind of TV image quality adjustment method, reduce by the brighter picture of integral body being carried out corresponding dynamic, do the compensation and the extension of contrast simultaneously, darker picture is not then adjusted, distinctive like this regulative mode is more scientific and reasonable, and realize conveniently, with low cost.
A further object of the invention is to provide a kind of method of adjustment of TV image quality, carry out progressively progressive mode by brightness and contrast and realize dynamic improvement picture, thereby avoid cataclysm because of the image quality jumping characteristic to cause visual impact to spectators, also the visual effect that the user is in use formed can be selected the adjustment effect to oneself adapting to most.
Basic conception of the present invention is: the picture of or whiting shinny for integral body, and the brightness of suitable reduction image in various degree and corresponding lifting contrast can obtain well arrangedly, and light and shade contrasts picture effect clearly.And above-mentionedly suitably reduce brightness for this picture and just be equivalent to deduct DC component in the brightness, so can not lose substantially the details than dark-part, even lose, because the attentiveness of human eye mainly concentrates on brighter part, also influence is very little.In addition, for the darker picture of integral body, image brightness can not reduce at all, otherwise can lose the details of a lot of dark portions.
To achieve these goals, the inventive method is on based on existing, as to have detected image overall brightness functional hardware platform, and implementation step is:
(1) the overall brightness value Yi of computed image signal;
(2) determine the target brightness value Bi of required adjusting according to above-mentioned overall brightness value Yi;
(3) regulate brightness value, and simultaneously the contrast of picture is compensated.
(4) turn back to the circulation of (1) step, thereby realize circulating frame by frame real-time dynamic adjustments.
In step (2), if the Yi＜=brightness of overall brightness value plays tone pitch Y_start, then the brightness of image is not adjusted, this brightness plays tone pitch Y_start and can be determined according to actual conditions by the engineer.
In step (3), the adjusting of brightness is that the mode of taking progressively to draw tracking is regulated, and a circulation only regulated for 1 step.
The compensation of contrast is undertaken by computing formula C=C0+C_compensate*Ba, wherein, and C0: be the contrast value before the dynamic adjustments; C_compensate: contrast compensation factor constant, Ba: the brightness of practical adjustments.
In practice, its more specifically performing step is as follows:
(1) initialization: S=0, Ba=0, wherein S: the memory variable relevant with governing speed; Ba: the actual reduction of the brightness value of image state;
(2) calculate Yi: be the overall brightness of the picture signal of front end Video Decoder or the output of ADC module, Yi=Yd/d calculates by formula;
Yd: be the accumulated value of Scaler module to the brightness value of all effective pixel points of the picture signal (promptly coming from Video Decoder or ADC module) of input, this accumulated value amounts to 32, and actual its most-significant byte assignment of getting is given Yd.
D: resolution reduced factor.For SD signal d=1; For the total pixel/720*480 of high-definition signal d=high-definition format, such as 720P signal, d=1280*720/720*480=2.67
(3) calculate Bi: the desired value of brightness reduction;
If 1. Yi＜=Y_start, then Bi=0; Wherein, Y_start has been degree of a lightening constant.
Dark picture when degree of lightening being set mainly considering for Yi＜=Y_start, system does not adjust the brightness value of image state, so just can guarantee that dark rank are normal.
If 2. Yi＞Y_start, then Bi=A_strong* (Yi-Y_start); Wherein, A_strong is for regulating the intensity constant.
If 3. Bi＞Bmax, Bi=Bmax then, Bmax: regulate upper limit constant.
(4) applicable value of change brightness adjustment makes it to go on foot near 1 with Bi.
(5) return the circulation of (2) step, thereby realize the real-time dynamic adjustments of circulation.
In practice, can progressively regulate, to realize the effective of image brightness to when best visual effect.
Adopt image quality adjustment method of the present invention, can carry out the real-time regulated of brightness according to the dynamic change of display frame brightness, simultaneously the contrast of picture is also done corresponding adjustment, thereby enrich gray-level and gradation performance, make display frame have light and shade and contrast effect clearly.This method adopts software mode just can realize that fully can not bring the increase of cost, the mode by software upgrading on existing type can realize this function, and is simple and easy to do on existing TV hardware foundation.
Description of drawings
Fig. 1 is a system architecture diagram of the invention process,
Fig. 2 is a control flow chart of the invention process.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail:
As shown in Figure 1, support the system architecture of image quality adjustment method of the present invention to comprise following functional module: VideoDecoder module or ADC module, Deinterlace ﹠amp; Scaler module, brightness/contrast control module and display.CVBS, Y, Yb, Yr picture signal arrive Deinterlace ﹠amp through the digital signal transmission that the decoding back generates; The Scaler module is carried out line by line, convergent-divergent is handled, simultaneously, and Deinterlace ﹠amp; The Scaler module also can be carried out brightness to above-mentioned digital video signal and be detected and calculate to realize the dynamic adjustments processing, the brightness/contrast control module is come the dynamic adjustments to the brightness and contrast according to the detection computations result then, exports display at last again to and realizes final the demonstration.
Above-mentioned is wherein a kind of dynamic image processing mode, and under another kind of dynamic process mode, brightness detects and calculates link and realizes in front end Video Decoder or ADC module.When adopting this mode, system need carry out corresponding compensation to the dynamic adjustments amount, and detailed description can be referring to the description of following embodiment two.
Below enumerating two embodiments is described further TV image quality adjustment method of the present invention.
Embodiment one: at system architecture shown in Figure 1, the step that TV image quality of the present invention is adjusted is as described below:
(1) initialization: S=0, Ba=0, wherein, S: the memory variable relevant with governing speed; Ba: the actual reduction of the brightness value of image state.
(2) calculate Yi: be the overall brightness of the picture signal of front end Video Decoder or the output of ADC module, Yi=Yd/d calculates by formula.
Yd: be the accumulated value of Scaler module to the brightness value of all effective pixel points of the picture signal (promptly coming from Video Decoder or ADC module) of input.This accumulated value amounts to 32, and actual its most-significant byte assignment of getting is given Yd.
D: resolution reduced factor.For SD signal d=1; For the total pixel/720*480 of high-definition signal d=high-definition format, such as 720P signal, d=1280*720/720*480=2.67
(3) calculate Bi: the desired value of brightness reduction.
If 1. Yi＜=Y_start, then Bi=0; Wherein, Y_start has been degree of a lightening constant.
Dark picture when degree of lightening being set mainly considering for Yi＜=Y_start, system does not adjust the brightness value of image state, so just can guarantee that dark rank are normal.
If 2. Yi＞Y_start, then Bi=A_strong* (Yi-Y_start); Wherein, A_strong is for regulating the intensity constant.
Show according to this computing formula, bright more picture, the regulated quantity of image state brightness value is big more.
If 3. Bi＞Bmax, Bi=Bmax then, Bmax: regulate upper limit constant.
In practice, can be divided into multistage according to actual needs and handle.
(4) applicable value of change brightness adjustment makes it close until equating with Bi.
S＝S+1，
IfS＜A_speed directly got back to for (2) step
ifS＝A_speed，
then:S＝0，
if?Ba＜Bi，Ba＝Ba+1；
if?Ba＞Bi，Ba＝Ba-1
Wherein, A_speed is the governing speed constant, and numerical value is big more, regulates slowly more, adopts the amplitude that this circulation can regulating and controlling, avoids the variation of jumping characteristic in the adjustment process.
(5) use Ba practical adjustments brightness and carry out corresponding contrast compensation.
Brightness regulation: B=B0-Ba; B0: be the brightness value before the dynamic adjustments, such as being 50 or user's set point under standard state.
Contrast compensation: C=C0+C_compensate*Ba; Wherein, C0: be the contrast value before the dynamic adjustments; C_compensate: contrast compensation factor constant.
(6) being back to step (2) circulates to detect in real time and regulates.
An above-mentioned cycle period is roughly 10ms.
Embodiment two: if the dynamic adjustments of brightness is to realize in front end video decoder or ADC module, then can influence the true Yd value of image, in this case, need compensate Yi when using the inventive method that the TV image quality is adjusted, compensation formula is:
Yi=(Yd+y*Ba)/d y: compensating factor, determine by practical measurement.
If desire is not made compensation operation or compensation is inaccurate, can not compensate, but will be in step (4) flow process
if?Ba＜Bi，Ba＝Ba+1；
if?Ba＞Bi，Ba＝Ba-1
Change into
if?Ba＜Bi-2，Ba＝Ba+1；
if?Ba＞Bi，Ba＝Ba-1
The purpose of Xiu Gaiing is to prevent self-excitation like this, guarantees that simultaneously Bi is that 0 o'clock Ba necessarily can make zero, and guarantees that the level of dark picture is not suffered a loss.Concrete treatment step can be carried out with reference to above-mentioned embodiment one described operation.
In above-mentioned two embodiments, involved constant will actual measurement be determined its desired value in concrete the application, and for a person skilled in the art, the selection of these constant parameter is determined to realize than being easier to.Each constant value is as follows in our PDP42U2A product: brightness plays tone pitch Y_start=6; Regulate intensity A _ strong=1.5; Governing speed A_speed=1; Regulate upper limit Bmax=30; Contrast compensation factor C_compensate=0.6.
Claims (4)
1, a kind of method of adjustment that is used for image quality is characterized in that the performing step of this method is:
(1) the overall brightness value Yi of computed image signal;
A, the decrease of the relevant memory variable of governing speed, image brightness value is carried out initialization, S=0 during initialization, Ba=0, wherein S: the memory variable relevant with governing speed; Ba: the decrease of image brightness value;
B, by formula Yi=Yd/d, calculate the overall brightness Yi of the picture signal of front end image decoder or analog to digital converter output, wherein, Yd is the accumulated value of brightness value of the effective pixel points of institute's received image signal, d is the resolution reduced factor, for SD signal d=1; For the total pixel/720*480 of high-definition signal d=high-definition format;
(2) determine the target brightness value Bi of required adjusting according to above-mentioned overall brightness value Yi;
(3) regulate brightness value, and simultaneously the contrast of picture is compensated;
(4) turn back to the circulation of (1) step, thereby realize circulating frame by frame real-time dynamic adjustments.
2, the method for adjustment that is used for image quality as claimed in claim 1, it is characterized in that in step (2), if overall brightness value Yi rises smaller or equal to brightness and transfers normal value Y_start, then the brightness of image is not adjusted, adjust big or small related with overall brightness value Yi.
3, the method for adjustment that is used for image quality as claimed in claim 1, the compensation that it is characterized in that contrast is undertaken by computing formula C=C0+C_compensate*Ba, wherein, C0 is the contrast value before the dynamic adjustments, C_compensate is a contrast compensation factor constant, and Ba is the decrease of the image brightness value of practical adjustments.
4, the method for adjustment that is used for image quality as claimed in claim 1 is characterized in that the target brightness value Bi of step (2), and concrete condition has:
If 1. Yi＜=Y_start, then Bi=0;
Brightness is set works secretly picture when transferring normal value Y_start mainly to consider for Yi＜=Y_start, system does not adjust the brightness value of image state, so just can guarantee that dark rank are normal;
If 2. Yi＞Y_start, then Bi=A_strong* (Yi-Y_start); Wherein, A_strong is for regulating the intensity constant.
If 3. Bi＞Bmax, Bi=Bmax then, Bmax: regulate upper limit constant.
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| CN102663985A (en) * | 2012-04-20 | 2012-09-12 | 深圳创维－Rgb电子有限公司 | Contrast and brightness linkage adjustment method and device |
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| CN103901378B (en) * | 2012-12-26 | 2018-01-12 | 深圳联影医疗科技有限公司 | The brightness control system and method for image in magnetic resonance system |
| CN103617783B (en) * | 2013-11-21 | 2017-02-08 | 深圳Tcl新技术有限公司 | Liquid crystal module pixel luminance regulating method and system |
| CN104753829B (en) | 2013-12-30 | 2019-08-30 | 中兴通讯股份有限公司 | Light-dimming method and dimming device |
| CN105898252A (en) * | 2015-11-26 | 2016-08-24 | 乐视致新电子科技（天津）有限公司 | Television color adjustment method and device |
| CN108111785B (en) * | 2017-12-28 | 2020-05-15 | Oppo广东移动通信有限公司 | Image processing method and device, computer readable storage medium and computer device |
| CN113099201B (en) * | 2021-03-30 | 2022-12-02 | 北京奇艺世纪科技有限公司 | Video signal processing method and device and electronic equipment |
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