CN103325355A - Method for dynamically adjusting backlight brightness based on image content - Google Patents
Method for dynamically adjusting backlight brightness based on image content Download PDFInfo
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- CN103325355A CN103325355A CN2013102419119A CN201310241911A CN103325355A CN 103325355 A CN103325355 A CN 103325355A CN 2013102419119 A CN2013102419119 A CN 2013102419119A CN 201310241911 A CN201310241911 A CN 201310241911A CN 103325355 A CN103325355 A CN 103325355A
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Abstract
The invention discloses a method for dynamically adjusting backlight brightness based on the image content. The method can dynamically adjust a backlight and adjust the image contrast effectively. The method includes the following steps: (1) calculating the gray level histogram of an image to be used for calculating the highest degree of distortion and the largest gain coefficient of the image; (2) limiting the maximum value of the gain coefficient to reduce the influences that the display effect is weakened and a user feels uncomfortable in vision, wherein the influences are caused by sudden change of the backlight; (3) according to the ambient brightness, determining the minimum value of the current brightness of a mobile phone to determine the current maximum distortion so that the situation that the user is unable to recognize the content on a screen because the environment is too bright will not happen; (4) introducing an image similarity algorithm of a historical frame and a current frame to reduce the number of times of calculation of the gain coefficient. The method dynamically adjusts the backlight according to the display content on the screen, reduces calculation amount to the greatest extent under the condition that the effect of the calculation amount on the performance of the mobile phone is taken into consideration, compensates for the caused image distortion, and ensures that the visual experience of the user will not be affected by the design of low power consumption.
Description
Technical field
The present invention relates to the Research on Digital Signal Processing field, particularly a kind of method based on picture material dynamic adjustments backlight illumination.
Background technology
Along with the function of smart mobile phone from strength to strength, with it and the power consumption of coming also increases progressively gradually.Be not only powerful calculated performance and abundant application program yet the user wishes to experience, lasting flying power also is the evaluation criterion of a mobile phone key, so low power dissipation design is the problem that many developers and designer must face.In the middle of whole cell phone system, the power consumption of display module has occupied 50 to 60 percent, and image shows it is the indispensable important component part of man-machine interaction.Therefore the power consumption that how to reduce display module is the mobile phone low power dissipation design most important thing.Nowadays the display screen that is widely used on the mobile phone is TFT-LCD, and the inner LED-backlit source of must adding of this class LCDs could normally show.Show according to the study, the backlight power consumption has occupied this display module power consumption more than 60 percent, so effectively reduce the key that the backlight power consumption is the mobile phone low power dissipation design.
At present, all kinds of adjusting back light source brightness that relate to reduce in the technology of power consumption, take static state setting as main, following shortcoming are arranged: (1) after reducing back light source brightness, image displaying quality descends, and has a strong impact on user's visual experience.(2) can not dynamically adjust in real time back light source brightness according to displaying contents, to such an extent as to can't obtain best reduction degree backlight, realize the balance of display effect and power consumption.(3) after reducing back light source brightness, can't carry out to displaying contents the image algorithm processing such as luminance compensation, remedy and reduce the image fault that back light source brightness causes.(4) saving energy of screen and distortion compensation algorithm with and fail well that combining environmental brightness responds adjustment, cause greatly reducing in the stronger situation sub-screen display effect of ambient brightness.The jump in brightness problem of bringing when (5) screen intensity changes brings discomfort for user's eyes.
Therefore, how in the situation that do not affect user's visual experience and can also reduce power consumption and become a research direction with very big using value.
Summary of the invention
Fundamental purpose of the present invention is to overcome the shortcoming of prior art with not enough, a kind of method based on picture material dynamic adjustments backlight illumination is provided, the method can guarantee still that when backlight illumination reduces greatly the picture quality that shows remains unchanged substantially, and then realizes reducing the purpose of power consumption.
Purpose of the present invention realizes by following technical scheme: a kind of method based on picture material dynamic adjustments backlight illumination may further comprise the steps:
(1) the rgb pixel value of image to be displayed being carried out grey level histogram processes;
(2) calculate the threshold values gray scale that RGB three colored pixels are overflowed by grey level histogram, the receptible image fault degree of human eye, choose wherein maximum one as gray threshold;
(3) gray threshold that obtains according to gray shade scale maximal value and the step (2) of image obtains gain coefficient a, and gain coefficient is the ratio of the two;
(4) be 1/a with display module PWM duty cycle adjustment, image pixel value all is stretched as original a doubly.
Preferably, described step (3) afterwards, the testing environment luminance brightness is determined screen lowest backlight intensity Bright
Min, calculate object brightness Bright
Aim=a*Bright
0, Bright wherein
0Be unchanged screen intensity, object brightness and screen lowest backlight intensity compared, if Bright
Aim＜Bright
Min, then make a=Bright
Min/ Bright
0, otherwise the value of a is constant; Then enter step (4).Introduce ambient brightness as the established standards of minimum brightness, the screen intensity that the inventive method is brought reduces can not make the user can't see screen content clearly.
Further, set a gain coefficient upper limit a
Max, enter step (4) before in definite a value, first with a and a
MaxCompare, if a a
Max, then make a=a
Max, otherwise the value of a is constant; Then enter step (4).By a is set
Max, to prevent the screen intensity caused visual discomfort that suddenlys change.
Preferably, define the frame number that a counter A is used for characterizing shown image, set a threshold value A max, when A value counting is Amax, judge with the image similarity algorithm whether present image is similar to the first two field picture, if similarly just only it is counted again, if dissimilar, when showing, the next frame image just recomputates gain coefficient, and counter A zero clearing.Just liquid crystal transmitance gain coefficient a is calculated once every the Amax frame, thereby can reduce calculated amount.
Further, define a counter B, and set a threshold value Bmax, if present image and the first two field picture are dissimilar, then make it increase by 1, then again carries out image similarity detection before the next frame image shows, similar then counter A, B zero clearing count again, and dissmilarity is then still carried out similarity at the next frame image and detected, and suppose to detect the image dissmilarity continuous Bmax time, when the next frame image shows, just recomputate so gain coefficient, change brightness backlight.
The present invention compared with prior art has following advantage and beneficial effect:
1, compared with prior art, the present invention is backlight according to the screen display content dynamic adjustments, and considers in the situation of calculated amount to the mobile phone performance impact reduce calculated amount, caused image fault is compensated, guarantee that user's visual experience is not subjected to the impact of low power dissipation design.
2, the present invention introduces the comparison of image similarity, reduces the calculation times of gain coefficient a value, reduces calculated amount.When introducing image similarity, judge the image dissmilarity as node take continuous several times, select to recomputate adjustment factor backlight, increased the accuracy of image similarity algorithm, more efficient.
3, introduce prevention screen intensity Mutation Mechanism among the present invention, seamlessly transit gain coefficient a, prevented the unexpected variation of screen intensity.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
As shown in Figure 1, a kind of method based on picture material dynamic adjustments backlight illumination of the present embodiment may further comprise the steps:
(1) two field picture is carried out the RGB histogram and process, obtain the grey level histogram of RGB three colors, suppose that its gray level is Grey
Max=256, definition human eye receptible image fault degree is D=10%, and LCD screen resolution is 480*272, can be drawn so the gray threshold item of RGB three colors by D and grey level histogram, choose wherein maximum one as threshold value gray scale item Grey
TresholdThereby, draw gain coefficient a=256/Grey
Treshold
(2) system has detected environmental light brightness by luminance sensor, the minimum brightness value Bright of the respective environment brightness that the coupling internal profile records
MinCalculate target backlight luminance Bright
Aim=a*Bright
0(Bright
0Be unchanged screen intensity), and and Bright
MinCompare.If Bright
Aim＜Bright
Min, then make a=Bright
Min/ Bright
0, enter next step.Otherwise a is constant, directly enters next step.
(3) set a gain coefficient upper limit a
Max, a value that is calculated by said process must not surpass this upper limit.Contrast a and a
MaxSize, if a〉a
Max, then make a=a
Max, otherwise the value of a is constant.
(4) utilize PWM control backlight, can quantitatively change backlight intensity by regulating its dutycycle, its brightness is L when supposing with constant voltage driving backlight
0, for reducing backlight illumination, make its brightness become L
0/ a, need regulate so dutycycle is 1/a.Image pixel value then all is stretched as original a doubly.
Wherein, after the first two field picture has been carried out above operation, defined the frame number that a counter A is used for characterizing shown image, suppose that A value counting is at 10 o'clock, then judge with the image similarity algorithm whether present image is similar to the first two field picture, if similarly just only it is counted again, if dissimilar, define a counter B, and make it increase by 1, then before showing, the next frame image detects in the carries out image similarity, similar then counter A, B zero clearing counts again, and dissmilarity is then still carried out similarity at the next frame image and detected, and supposes to detect the image dissmilarity continuous 3 times, when the next frame image shows, just recomputate so gain coefficient a, change brightness backlight.
Above-described embodiment is the better embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (5)
1. the method based on picture material dynamic adjustments backlight illumination is characterized in that, may further comprise the steps:
(1) the rgb pixel value of image to be displayed being carried out grey level histogram processes;
(2) calculate the threshold values gray scale that RGB three colored pixels are overflowed by grey level histogram, the receptible image fault degree of human eye, choose wherein maximum one as gray threshold;
(3) gray threshold that obtains according to gray shade scale maximal value and the step (2) of image obtains gain coefficient a, and gain coefficient is the ratio of the two;
(4) be 1/a with display module PWM duty cycle adjustment, image pixel value all is stretched as original a doubly.
2. the method based on picture material dynamic adjustments backlight illumination according to claim 1 is characterized in that, described step (3) afterwards, the testing environment luminance brightness is determined screen lowest backlight intensity Bright
Min, calculate object brightness Bright
Aim=a*Bright
0, Bright wherein
0Be unchanged screen intensity, object brightness and screen lowest backlight intensity compared, if Bright
Aim＜Bright
Min, then make a=Bright
Min/ Bright
0, otherwise the value of a is constant; Then enter step (4).
3. the method based on picture material dynamic adjustments backlight illumination according to claim 2 is characterized in that, sets a gain coefficient upper limit a
Max, enter step (4) before in definite a value, first with a and a
MaxCompare, if a a
Max, then make a=a
Max, otherwise the value of a is constant; Then enter step (4).
4. the method based on picture material dynamic adjustments backlight illumination according to claim 1 is characterized in that, defines the frame number that a counter A is used for characterizing shown image, sets a threshold value A
Max, when A value counting is A
MaxThe time, judge with the image similarity algorithm whether present image is similar to the first two field picture, if similarly just only it is counted again, if dissmilarity just recomputates gain coefficient when the next frame image shows, and counter A zero clearing.
5. the method based on picture material dynamic adjustments backlight illumination according to claim 4 is characterized in that, defines a counter B, and sets a threshold value B
MaxIf present image and the first two field picture are dissimilar, then make it increase by 1, then again carries out image similarity detection before the next frame image shows, similar then counter A, B zero clearing count again, and dissmilarity is then still carried out similarity at the next frame image and detected, and supposes continuous B
MaxThe inferior image dissmilarity that detects just recomputates gain coefficient so when the next frame image shows.
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| CN201310241911.9A CN103325355B (en) | 2013-06-18 | 2013-06-18 | A kind of method of image content-based dynamic adjustments backlight illumination |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103810980A (en) * | 2014-01-23 | 2014-05-21 | 华南理工大学 | Image occurrence frequency based liquid crystal display power consumption reducing method |
| CN104008734A (en) * | 2014-06-18 | 2014-08-27 | 中科创达软件股份有限公司 | Method and device for adjusting screen backlight on basis of displayed content |
| CN104469239A (en) * | 2014-12-05 | 2015-03-25 | 宁波菊风系统软件有限公司 | Immersive video presenting method of smart mobile terminal |
| CN104915166A (en) * | 2015-03-20 | 2015-09-16 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104952045A (en) * | 2014-03-27 | 2015-09-30 | 韩华泰科株式会社 | Defogging system and defogging method |
| WO2016023247A1 (en) * | 2014-08-13 | 2016-02-18 | 深圳市华星光电技术有限公司 | 3d display method and display device |
| US9373288B2 (en) | 2014-08-28 | 2016-06-21 | Microsoft Technology Licensing, Llc | Configurable, localized backlighting with planar emission devices |
| CN106941625A (en) * | 2017-03-10 | 2017-07-11 | 广东欧珀移动通信有限公司 | A kind of control method for playing back of mobile terminal, device and mobile terminal |
| US9711091B2 (en) | 2014-08-13 | 2017-07-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | 3D display method and display device |
| CN107210024A (en) * | 2014-12-30 | 2017-09-26 | 三星电子株式会社 | Display device and its control method |
| CN107342054A (en) * | 2017-07-14 | 2017-11-10 | 京东方科技集团股份有限公司 | Display device, display control method and display control unit |
| CN108257580A (en) * | 2016-12-28 | 2018-07-06 | 中科创达软件股份有限公司 | A kind of adjusting method and device of the display picture based on backlight illumination |
| CN110211548A (en) * | 2018-02-28 | 2019-09-06 | 华为技术有限公司 | Adjust the method and electronic equipment of display brightness |
| CN110365951A (en) * | 2018-04-10 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | A kind of projection method of adjustment, projection device, server and computer storage medium |
| CN110890063A (en) * | 2019-11-22 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Method and device for reducing power consumption of display panel |
| US10726801B2 (en) | 2015-04-17 | 2020-07-28 | Microsoft Technology Licensing, Llc | Display defect compensation with localized backlighting |
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| CN103810980A (en) * | 2014-01-23 | 2014-05-21 | 华南理工大学 | Image occurrence frequency based liquid crystal display power consumption reducing method |
| CN104952045A (en) * | 2014-03-27 | 2015-09-30 | 韩华泰科株式会社 | Defogging system and defogging method |
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| CN104008734A (en) * | 2014-06-18 | 2014-08-27 | 中科创达软件股份有限公司 | Method and device for adjusting screen backlight on basis of displayed content |
| US9711091B2 (en) | 2014-08-13 | 2017-07-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | 3D display method and display device |
| WO2016023247A1 (en) * | 2014-08-13 | 2016-02-18 | 深圳市华星光电技术有限公司 | 3d display method and display device |
| US9373288B2 (en) | 2014-08-28 | 2016-06-21 | Microsoft Technology Licensing, Llc | Configurable, localized backlighting with planar emission devices |
| CN104469239A (en) * | 2014-12-05 | 2015-03-25 | 宁波菊风系统软件有限公司 | Immersive video presenting method of smart mobile terminal |
| CN107210024A (en) * | 2014-12-30 | 2017-09-26 | 三星电子株式会社 | Display device and its control method |
| US11122235B2 (en) | 2014-12-30 | 2021-09-14 | Samsung Electronics Co., Ltd. | Display device and control method therefor |
| CN104915166A (en) * | 2015-03-20 | 2015-09-16 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN104915166B (en) * | 2015-03-20 | 2019-02-05 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| US10726801B2 (en) | 2015-04-17 | 2020-07-28 | Microsoft Technology Licensing, Llc | Display defect compensation with localized backlighting |
| CN108257580A (en) * | 2016-12-28 | 2018-07-06 | 中科创达软件股份有限公司 | A kind of adjusting method and device of the display picture based on backlight illumination |
| CN108257580B (en) * | 2016-12-28 | 2020-08-28 | 中科创达软件股份有限公司 | Display picture adjusting method and device based on backlight brightness |
| CN106941625A (en) * | 2017-03-10 | 2017-07-11 | 广东欧珀移动通信有限公司 | A kind of control method for playing back of mobile terminal, device and mobile terminal |
| CN107342054A (en) * | 2017-07-14 | 2017-11-10 | 京东方科技集团股份有限公司 | Display device, display control method and display control unit |
| CN107342054B (en) * | 2017-07-14 | 2019-09-17 | 京东方科技集团股份有限公司 | Display device, display control method and display control unit |
| CN110211548B (en) * | 2018-02-28 | 2021-03-30 | 华为技术有限公司 | Method for adjusting display brightness and electronic equipment |
| CN110211548A (en) * | 2018-02-28 | 2019-09-06 | 华为技术有限公司 | Adjust the method and electronic equipment of display brightness |
| CN110365951A (en) * | 2018-04-10 | 2019-10-22 | 佛山市顺德区美的电热电器制造有限公司 | A kind of projection method of adjustment, projection device, server and computer storage medium |
| CN110890063A (en) * | 2019-11-22 | 2020-03-17 | 深圳市华星光电半导体显示技术有限公司 | Method and device for reducing power consumption of display panel |
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