CN105869577A - Display device image processing method and system - Google Patents
Display device image processing method and system Download PDFInfo
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- CN105869577A CN105869577A CN201510846037.0A CN201510846037A CN105869577A CN 105869577 A CN105869577 A CN 105869577A CN 201510846037 A CN201510846037 A CN 201510846037A CN 105869577 A CN105869577 A CN 105869577A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/57—Control of contrast or brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a display device image processing method and a processing system, wherein the method comprises the following steps: analyzing a video input signal so as to obtain a histogram and an average brightness value of a video frame image; regulating backlight brightness in accordance with the average brightness value, and outputting a regulated brightness signal to a backlight source; and dynamically improving the data level of the video input signal in accordance with the histogram, and outputting the regulated video signal to a liquid crystal panel. According the image processing method and the image processing system disclosed by the invention, by dynamically reducing the backlight brightness and by dynamically improving the data level of the video image, the contrast ratio, the field depth and the layering sense of a picture are improved while power consumption is reduced, so that energy is saved, and meanwhile, a picture quality is better improved.
Description
Technical field
The present invention relates to technical field of video image processing, particularly to a kind of display device images
Processing method and system.
Background technology
Along with the development of lcd technology, LCD TV is owing to having brightness height, gray scale
High, light, thin, the feature more and more welcomed by the people of fashion, and along with its cost performance
Raising, more and more family, public place of entertainment advertising media business in one's power using LCD TV as first-selection
Amusement display terminal.But owing to LCD TV is compared to former CRT (cathode ray tube, Cathode
Ray Tube) TV its display picture significantly increase (generally more than 32 inches), it is consumed
Electric energy there has also been significantly raising.Owing to liquid crystal display screen is passive-type display device, it is necessary to provide
Individually back light, shows image by liquid crystal as controlled light valve.Therefore, current
LCD TV power consumption is relatively big, and backlight power consumption accounts for more than 80%.Under the purport advocating energy-conserving and environment-protective,
The method mainly backlight that LCD TV reduces power consumption removes reducing power consumption.
It is to reduce power consumption by reduction backlight illumination that tradition reduces the way of power consumption, passes through human eye
The light levels of sensation TV image, then by adjusting the method for backlight intensity by regulation image
The adjustment suitable to screen intensity of the GTG of signal, changes screen backlight brightness, it is achieved backlight control merit
Energy.Existing this backlight control is easier to lose the tonal gradation of image makes GTG reduce so that
Overall (dark scene, middle bright field scape, highlight scene) picture brightness reduces, and seriously sacrifices picture
Quality.Simultaneously because backlight illumination does not changes with the bright dark change of picture background, backlight illumination is
Constant, energy consumption is bigger.
Summary of the invention
Embodiments provide a kind of display device images processing method and system, in order to solve
Certainly in prior art on the premise of not sacrificing image quality, reduce the power consumption of display device.
On the one hand, the present invention provides a kind of display device images processing method, comprises the steps:
Video input signals analysis is obtained rectangular histogram and the average brightness value of video frame images；
According to average brightness value adjust backlight illumination, and will adjust after luminance signal output to the back of the body
Light source；
The data level of video input signals is dynamically promoted according to described rectangular histogram, and by after adjustment
Video signal export to liquid crystal panel.
Alternatively, adjust backlight illumination according to average brightness value to include:
Average brightness value according to frame of video is big with brightness adjustment threshold value THD pre-set
Little dynamic adjustment is to the brightness value signal of backlight.
On the other hand, the present invention provides a kind of display device images processing system, including:
Video signal analysis module, for obtaining video frame images to video input signals analysis
Rectangular histogram and average brightness value；
Backlight illumination adjusting module, for adjusting backlight illumination according to average brightness value, and will adjust
Luminance signal after whole exports to backlight；
Video signal strengthens module, for dynamically promoting video input signals according to described rectangular histogram
Data level, and will adjust after video signal export to liquid crystal panel.
The display device images processing method of present invention offer and system, by dynamically reducing backlight
Brightness, dynamically promotes the data level of video image, improves picture while reducing power consumption
Contrast, the depth of field and stereovision, energy-conservation while can well promote again image quality.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below
By the accompanying drawing used required in embodiment or description of the prior art is briefly described, aobvious
And easy insight, the accompanying drawing in describing below is some embodiments of the present invention, general for this area
From the point of view of logical technical staff, on the premise of not paying creative work, it is also possible to attached according to these
Figure obtains other accompanying drawing.
Fig. 1 is display device images process flow schematic diagram of the present invention；
Fig. 2 is dynamic backlight curve synoptic diagram of the present invention；
Fig. 3 is level dutycycle schematic diagram of the present invention；
Fig. 4 is that the present invention dynamically adjusts enhancing signal incoming level schematic diagram；
Fig. 5 a is raw frames schematic diagram；
Fig. 5 b is the picture view after dynamically adjusting backlight；
Fig. 5 c is the picture view after image procossing of the present invention；
Fig. 6 is display device images processing system structural representation of the present invention.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear,
Be fully described by, it is clear that described embodiment be a part of embodiment of the present invention rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
Make the every other embodiment obtained under creative work premise, broadly fall into present invention protection
Scope.
As it is shown in figure 1, the present invention provides a kind of display device images processing method, the method bag
Include following steps: video input signals analysis is obtained the rectangular histogram of video frame images and the brightest
Angle value；According to average brightness value adjust backlight illumination, and will adjust after luminance signal export extremely
Backlight；Dynamically promote the data level of video input signals according to described rectangular histogram, and will adjust
Video signal after whole exports to liquid crystal panel.The display device images below present invention provided
Processing method launches detailed description.
First, the rectangular histogram that video input signals analysis is obtained video frame images is introduced with average
The step of brightness value.
As it is shown in figure 1, in the present invention, it is preferred to analyzed by existing image analysis system
The rectangular histogram (Histogram) of each video frame images and average brightness value in video signal
(Average Pixel Level is called for short APL).Such as, by each video frame images
The initial data of each pixel (Pixel) carries out adding up the data (data) drawn and obtains each
The rectangular histogram of video frame images, is averaged brightness value to the pixel of each video frame images.
Secondly, adjust backlight illumination according to average brightness value, and the luminance signal after adjusting is defeated
Go out to backlight.
As in figure 2 it is shown, after obtaining the average brightness value of frame of video, the brightest according to frame of video
Angle value and brightness adjustment threshold value THD (Threshold, threshold value) pre-set are by number
The video input signals brightness value signal to backlight is adjusted according to strengthening system dynamics, defeated with video
The change Real-time and Dynamic of the average brightness value entering the frame of video of signal adjusts output luminance signal
Backlight pulse width modulation value.
Specifically, the average brightness value of the current video frame obtained is adjusted with the brightness pre-set
The size of whole threshold value dynamically adjusts the brightness value signal to backlight.If current video frame is flat
All brightness values more than or equal to the brightness adjustment threshold value preset, then bright to backlight output 100%
Angle value signal, shown in brightness value such as formula (1).
PWM=100% (APL >=THD) (1)
Wherein, PWM represents the brightness value to backlight.
If the average brightness value of current video frame is less than the brightness adjustment threshold value preset, then basis
Acceptable brightness value, average brightness value and the brightness adjustment threshold value pre-set pre-set
The common brightness value signal adjusted to backlight output, shown in brightness value such as formula (2).
Wherein, PWM represents the brightness value to backlight, and Base represents acceptable brightness value,
APL represents the average brightness value of current video frame, and THD represents the brightness adjustment pre-set
Threshold value.In the present invention, acceptable brightness value Base and the brightness adjustment threshold pre-set
Value THD can be arranged the most flexibly.
The present invention adjusts backlight open or the closedown of backlight according to the brightness value signal of backlight
Time.As it is shown on figure 3, ON represents the time of backlight open, OFF represents that backlight is closed
Time.Such as, in a frame of video picture, when back light source brightness value 100%, the back of the body
Light source backlight is opened for a long time, when back light source brightness value is 50%, and backlight opening time and pass
Time of closing identical (respectively accounting for 50%).When back light source brightness value is 17%, the backlight of backlight
Opening time accounts for 17%, and the backlight backlight shut-in time accounts for 83%.Backlight after adjusting the most at last
Luminance signal sends the backlight to display device.In the present invention, it is preferred to pass through backlight pulse
Width modulation value (PWM Duty) control system adjusts.
As shown in Figure 4, after obtaining the histogram value of frame of video, lead to according to the rectangular histogram of frame of video
Cross data enhancement system and dynamically promote the data level of video input signals by enhanced image
Signal transmission shows to liquid crystal panel.Specifically, as shown in Figure 4, by dynamically promoting video
The data level of input signal, can be by the histogram distribution expanded range of current video frame.Dynamic
State promotes the data level of video input signals can pass through existing histogram equalization
Video frame images is processed by (Histogram Equalization).Specifically, histogram equalization
Change then by using cumulative function that gray value is adjusted realizing the enhancing of contrast.Nogata
Figure equalization is the side utilizing image histogram to be adjusted contrast in image processing field
Method.This method is commonly used to increase the local contrast of many images, especially when image
When the contrast of useful data is fairly close, by this method, brightness can be preferably directly
The upper distribution of side's figure.Thus may be used for strengthening the contrast of local and not affecting the contrast of entirety
Degree, histogram equalization realizes this function by effectively extending conventional brightness.By scheming
Contrast before and after frame of video histogram enhancement in 4, it can be clearly seen that, enhanced data model
Enclosing change wide, histogrammic distribution also becomes evenly.So that it is subjective on the picture of display
On can be seen that picture contrast is higher, stereovision and the depth of field become more preferable.
As shown in Figure 5 a, the power consumption of raw frames 90 watts, picture contrast is 74:1, figure
In the brightness value of dark areas be 0.82nits, the brightness value of the luminance area of brightest area is
60.6nits.As shown in Figure 5 b, the power consumption of the picture dynamically adjusted is 57 watts, picture right
Being 77:1 than degree, in figure, the brightness value of dark areas is 0.52nits, the brightness of brightest area
The brightness value in region is 40.3nits.Although reducing by the way of dynamically adjusting backlight picture
Power consumption still, have lost the brightness of picture simultaneously.As shown in Figure 5 c, the present invention is used to provide
Display device images processing method and the picture power consumption that processed of system be 24 watts, picture pair
Being 275:1 than degree, in figure, the brightness value of dark areas is 0.22nits, the brightness region of brightest area
The brightness value in territory is 60.6nits.The method provided by the present invention, while reducing power consumption,
Do not reduce picture brightness, improve the contrast of picture.It follows that the present invention is at original picture
Reducing while job number picture compared with the mode that conventional dynamic adjusts backlight on the basis of face
Face definition is obviously improved, and picture contrast is higher, stereovision and the depth of field become more preferable.
For embodying the superiority of the display device images processing method that the present invention provides further originally
Invention also provide for a kind of should display device images processing system in aforementioned manners, such as Fig. 6 institute
Showing, this system includes: video signal analysis module, for obtaining video input signals analysis
The rectangular histogram of video frame images and average brightness value；Backlight illumination adjusting module, for according to flat
All brightness values adjust backlight illumination, and the luminance signal after adjusting exports to backlight；Video
Signal strengthens module, for dynamically promoting the data electricity of video input signals according to described rectangular histogram
Flat, and the video signal after adjusting exports to liquid crystal panel.
As it is shown in figure 1, in the present invention, video signal analysis module, by existing image
Analyze systematic analysis and go out the rectangular histogram (Histogram) of each video frame images in video signal
With average brightness value (Average Pixel Level is called for short APL).Such as, by each
The initial data of each pixel (Pixel) of video frame images carries out adding up the data drawn
(data) obtain the rectangular histogram of each video frame images, the pixel of each video frame images is taken
Average brightness value.
As in figure 2 it is shown, after obtaining the average brightness value of frame of video, backlight illumination adjusting module root
According to frame of video average brightness value with pre-set brightness adjustment threshold value THD (Threshold,
Threshold value) dynamically adjust the video input signals brightness value to backlight by data enhancement system
Signal, adjusts defeated with the change Real-time and Dynamic of the average brightness value of the frame of video of video input signals
Go out the backlight pulse width modulation value of luminance signal.
Specifically, described backlight illumination adjusting module also includes judge module, described judge module
Big petty action for the average brightness value according to frame of video with the brightness adjustment threshold value pre-set
State adjusts the brightness value signal to backlight.If the average brightness value of current video frame is more than
In default brightness adjustment threshold value, then to the brightness value signal of backlight output 100%, brightness
Value is as shown in formula (3).
PWM=100% (APL >=THD) (3)
Wherein, PWM represents the brightness value to backlight.
If the average brightness value of current video frame is less than the brightness adjustment threshold value preset, then basis
Acceptable brightness value, average brightness value and the brightness adjustment threshold value pre-set pre-set
The common brightness value signal adjusted to backlight output, shown in brightness value such as formula (4).
Wherein, PWM represents the brightness value to backlight, and Base represents acceptable brightness value,
APL represents the average brightness value of current video frame, and THD represents the brightness adjustment pre-set
Threshold value.In the present invention, acceptable brightness value Base and the brightness adjustment threshold pre-set
Value THD can be arranged the most flexibly.
The present invention adjusts backlight open or the closedown of backlight according to the brightness value signal of backlight
Time.As it is shown on figure 3, ON represents the time of backlight open, OFF represents that backlight is closed
Time.Such as, in a frame of video picture, when back light source brightness value 100%, the back of the body
Light source backlight is opened for a long time, when back light source brightness value is 50%, and backlight opening time and pass
Time of closing identical (respectively accounting for 50%).When back light source brightness value is 17%, the backlight of backlight
Opening time accounts for 17%, and the backlight backlight shut-in time accounts for 83%.Backlight after adjusting the most at last
Luminance signal sends the backlight to display device.In the present invention, it is preferred to pass through backlight pulse
Width modulation value (PWM Duty) control system adjusts.
As shown in Figure 4, after obtaining the histogram value of frame of video, video signal strengthen module according to
The rectangular histogram of frame of video dynamically promotes the data electricity of video input signals by data enhancement system
Put down and the transmission of enhanced picture signal is shown to liquid crystal panel.Specifically, as shown in Figure 4,
By dynamically promoting the data level of video input signals, can be by the rectangular histogram of current video frame
Distribution expands.Dynamically promote video input signals data level can by existing directly
Video frame images is processed by side's figure equalization (Histogram Equalization).Specifically,
Histogram equalization is then by using cumulative function to be adjusted realizing contrast to gray value
Enhancing.Histogram equalization is to utilize image histogram to enter contrast in image processing field
The method of Row sum-equal matrix.This method is commonly used to increase the local contrast of many images, especially
It is when the contrast of the useful data of image is fairly close when.By this method, brightness
Can be distributed the most on the histogram.Thus may be used for strengthen local contrast and not
The contrast that impact is overall, histogram equalization realizes by effectively extending conventional brightness
This function.By the contrast before and after frame of video histogram enhancement in Fig. 4, it can be clearly seen that,
Enhanced scope of data becomes wide, and histogrammic distribution also becomes evenly.And from being aobvious
Subjective on the picture shown can be seen that picture contrast is higher, stereovision and the depth of field become more
Good.
As shown in Figure 5 a, the power consumption of raw frames 90 watts, picture contrast is 74:1, figure
In the brightness value of dark areas be 0.82nits, the brightness value of the luminance area of brightest area is
60.6nits.As shown in Figure 5 b, the power consumption of the picture dynamically adjusted is 57 watts, picture right
Being 77:1 than degree, in figure, the brightness value of dark areas is 0.52nits, the brightness of brightest area
The brightness value in region is 40.3nits.Although reducing by the way of dynamically adjusting backlight picture
Power consumption still, have lost the brightness of picture simultaneously.As shown in Figure 5 c, the present invention is used to provide
Display device images processing method and the picture power consumption that processed of system be 24 watts, picture pair
Being 275:1 than degree, in figure, the brightness value of dark areas is 0.22nits, the brightness region of brightest area
The brightness value in territory is 60.6nits.The method provided by the present invention, while reducing power consumption,
Do not reduce picture brightness, improve the contrast of picture.It follows that the present invention is at original picture
Reducing while job number picture compared with the mode that conventional dynamic adjusts backlight on the basis of face
Face definition is obviously improved, and picture contrast is higher, stereovision and the depth of field become more preferable.
In sum, the display device images processing method of present invention offer and system, by dynamic
State reduces backlight illumination, dynamically promotes the data level of video image, while reducing power consumption
Improve the contrast of picture, the depth of field and stereovision, energy-conservation while can well promote again picture
Matter.
Device embodiment described above is only schematically, wherein said as separated part
The unit of part explanation can be or may not be physically separate, shows as unit
Parts can be or may not be physical location, i.e. may be located at a place, or also
Can be distributed on multiple NE.Can select according to the actual needs part therein or
The whole module of person realizes the purpose of the present embodiment scheme.Those of ordinary skill in the art are not paying
In the case of going out performing creative labour, i.e. it is appreciated that and implements.
Through the above description of the embodiments, those skilled in the art it can be understood that
The mode of required general hardware platform can be added by software to each embodiment to realize, certainly
Hardware can also be passed through.Based on such understanding, technique scheme is the most in other words to existing
The part having technology to contribute can embody with the form of software product, and this computer is soft
Part product can store in a computer-readable storage medium, such as ROM/RAM, magnetic disc, light
Dish etc., including some instructions with so that computer equipment (can be personal computer,
Server, or the network equipment etc.) perform some part institute of each embodiment or embodiment
The method stated.
Last it is noted that above example is only in order to illustrate technical scheme, and
Non-to its restriction；Although the present invention being described in detail with reference to previous embodiment, ability
The those of ordinary skill in territory is it is understood that it still can be to the skill described in foregoing embodiments
Art scheme is modified, or wherein portion of techniques feature is carried out equivalent；And these are repaiied
Change or replace, not making the essence of appropriate technical solution depart from various embodiments of the present invention technical side
The spirit and scope of case.
Claims (10)
1. a display device images processing method, it is characterised in that comprise the steps:
Video input signals analysis is obtained rectangular histogram and the average brightness value of video frame images；
According to average brightness value adjust backlight illumination, and will adjust after luminance signal output to the back of the body
Light source；
The data level of video input signals is dynamically promoted according to described rectangular histogram, and by after adjustment
Video signal export to liquid crystal panel.
Display device images processing method the most according to claim 1, it is characterised in that
Adjust backlight illumination according to average brightness value to include:
Average brightness value according to frame of video is big with brightness adjustment threshold value THD pre-set
Little dynamic adjustment is to the brightness value signal of backlight.
Display device images processing method the most according to claim 2, it is characterised in that
If the average brightness value of current video frame is more than or equal to the brightness adjustment threshold value preset, then export
Brightness value is shown below:
PWM=100% (APL >=THD)
Wherein, PWM represents the brightness value to backlight；
If the average brightness value of current video frame is less than the brightness adjustment threshold value preset, then brightness
Value is shown below:
Wherein, PWM represents the brightness value to backlight, and Base represents acceptable brightness value,
APL represents the average brightness value of current video frame, and THD represents the brightness adjustment pre-set
Threshold value.
Display device images processing method the most according to claim 1, it is characterised in that
Rectangular histogram and the average brightness value of described video frame images are obtained by image analysis system.
Display device images processing method the most according to claim 1, it is characterised in that
The data level of described dynamic lifting video input signals is promoted by data enhancement system.
Display device images processing method the most according to claim 1, it is characterised in that
Described backlight illumination is adjusted by backlight pulse width modulation value control system.
Display device images processing method the most according to claim 1, it is characterised in that
The data level of described dynamic lifting video input signals is obtained by histogram equalization.
8. a display device images processing system, it is characterised in that including:
Video signal analysis module, for obtaining video frame images to video input signals analysis
Rectangular histogram and average brightness value；
Backlight illumination adjusting module, for adjusting backlight illumination according to average brightness value, and will adjust
Luminance signal after whole exports to backlight；
Video signal strengthens module, for dynamically promoting video input signals according to described rectangular histogram
Data level, and will adjust after video signal export to liquid crystal panel.
Display device images processing system the most according to claim 8, it is characterised in that
Described backlight illumination adjusting module also includes judge module,
Described judge module is for the average brightness value according to frame of video and the brightness pre-set
The size adjusting threshold value dynamically adjusts the brightness value signal to backlight；
If the average brightness value of current video frame is more than or equal to the brightness adjustment threshold value preset, then
Output brightness value is shown below:
PWM=100% (APL >=THD)
Wherein, PWM represents the brightness value to backlight；
If the average brightness value of current video frame is less than the brightness adjustment threshold value preset, then brightness
Value is shown below:
Wherein, PWM represents the brightness value to backlight, and Base represents acceptable brightness value,
APL represents the average brightness value of current video frame, and THD represents the brightness adjustment pre-set
Threshold value.
Display device images processing system the most according to claim 8, it is characterised in that
Described backlight illumination is adjusted by backlight pulse width modulation value control system.
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| CN201510846037.0A CN105869577A (en) | 2015-11-25 | 2015-11-25 | Display device image processing method and system |
| PCT/CN2016/088653 WO2017088483A1 (en) | 2015-11-25 | 2016-07-05 | Display device image processing method and system, computer program and storage medium |
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| CN201510846037.0A CN105869577A (en) | 2015-11-25 | 2015-11-25 | Display device image processing method and system |
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| CN108281125A (en) * | 2018-01-05 | 2018-07-13 | 华为技术有限公司 | The method, apparatus and equipment of backlight illumination adjusting are carried out according to human eye characteristic |
| WO2019179512A1 (en) * | 2018-03-22 | 2019-09-26 | 京东方科技集团股份有限公司 | Display method, display device, and display |
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| CN113299246A (en) * | 2021-05-12 | 2021-08-24 | 惠州视维新技术有限公司 | Backlight module brightness adjusting method, adjusting circuit and display device |
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