CN102737610B - Method and apparatus for adjusting light source brightness, and display device - Google Patents
Method and apparatus for adjusting light source brightness, and display device Download PDFInfo
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Abstract
The embodiment of the invention discloses a method and an apparatus for adjusting light source brightness, and a display device. The invention relates to the field of image processing, and the method, the apparatus and the display device are invented to increase contrast of a current display image. The method comprises: receiving the current display image, obtaining brightness information and saturation information of the current display image, obtaining brightness adjustment values of three-primary-color light sources matched with the current display image according to the brightness information and the saturation information, and further adjusting the brightness of the three-primary-color light sources according to the brightness adjustment values of the three-primary-color light sources. The method, the apparatus and the display device are mainly used in various display apparatuses.
Description
Technical field
The present invention relates to image processing field, particularly relate to a kind of method for adjusting brightness of light source, device and display device.
Background technology
At present, LED (Light Emitting Diode, light emitting diode), the new type light source such as LASER (laser) progressively substitutes UHP (Ultra High Power, ultra high power), the conventional light source such as CCFL (Cold Cathode Fluorescent Lamp, cold-cathode fluorescence lamp).Above-mentioned new type light source has the advantages such as rich color, adjustable color, dynamic control, such as, adopts LASER the colour gamut of display image can be made to reach more than 90% of human eye institute identification colors as three primary light source.
In the process using above-mentioned new type light source, inventor finds that prior art can not adjust the brightness of new type light source automatically according to the information of current display image, thus cannot ensure that display image has higher contrast.
Summary of the invention
The embodiment of the present invention provides a kind of method for adjusting brightness of light source, device and display device, improves the contrast of current display image.
The embodiment of the present invention adopts following technical scheme:
A kind of method for adjusting brightness of light source, comprising:
Receive current display image;
Obtain monochrome information and the saturation infromation of described current display image;
The three primary light source brightness adjustment value matched with described current display image is obtained according to described monochrome information and saturation infromation;
According to the brightness of described three primary light source brightness adjustment value adjustment three primary light source.
A kind of light-source brightness adjusting gear, comprising:
Receiving element, for receiving current display image;
First acquiring unit, for obtaining monochrome information and the saturation infromation of described current display image;
Second acquisition unit, for obtaining according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image;
Adjustment unit, for the brightness according to described three primary light source brightness adjustment value adjustment three primary light source.
A kind of display device, comprising: light-source brightness adjusting gear.
The method for adjusting brightness of light source that the embodiment of the present invention provides, device and display device, receive current display image, and obtain monochrome information and the saturation infromation of described current display image, obtain according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image, and then adjust the brightness of three primary light source according to described three primary light source brightness adjustment value.Due to the brightness adjustment value of the three primary light source that display device can match according to the acquisition of information of current display image and this display image, and the brightness of current display image is adjusted according to described brightness adjustment value, thus adjust the contrast of this display image, therefore, utilize the technical scheme of the embodiment of the present invention, improve the contrast of current display image.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the embodiment of the present invention one method for adjusting brightness of light source;
Fig. 2 is the schematic diagram of the embodiment of the present invention two light-source brightness adjusting gear;
Fig. 3 is the schematic diagram of embodiment of the present invention light-source brightness adjustment System.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the embodiment of the present invention one provides a kind of method for adjusting brightness of light source, comprises the steps:
Step 11, receive current display image.
In the present embodiment, the master controller in display device receives current display image by video input device.
Step 12, the monochrome information obtaining described current display image and saturation infromation.
Wherein, described master controller first by current display image by RGB (Red, Green, Blue, red, green, blue) color space is converted to HSI (Hue, Saturation, Intensity, colorfulness, saturation degree, brightness) color space, then obtain monochrome information and the saturation infromation with the current display image of described HSI color space.
Described HSI color space is applicable to the examination and analysb of chromatic characteristic, because the foundation of this color space is based on two facts: 1, the chromatic information of I (Intensity, brightness) component and image has nothing to do; 2, H (Hue, colorfulness) component and S (Saturation, saturation degree) component and user experience the mode of color is allo.Therefore, described master controller is easy to obtain monochrome information and the saturation infromation of the current display image with described HSI color space.
Wherein, rgb color space turns HIS color space and can utilize following conversion formula:
Wherein,
R, G, B represent the value of red in rgb color space, green and blue three components respectively, and F is the intermediate variable obtained by the value of red, green and blue three components, and I represents brightness, and S represents saturation degree, and H represents colorfulness.
Step 13, the three primary light source brightness adjustment value matched with described current display image according to described monochrome information and saturation infromation acquisition.
The process that described master controller obtains three primary light source brightness adjustment value can be: first, analyzes the described monochrome information and saturation infromation that obtain, and then obtains luminance factor and obtain the saturation degree coefficient of red, green, blue three kinds of colour light sources respectively; Then, by described current display Image Acquisition luminance factor proportion and the saturation degree coefficient proportion obtaining red, green, blue three kinds of colour light sources respectively, the saturation degree coefficient proportion of described luminance factor proportion and described red, green, blue three kinds of colour light sources meets normalized requirement; Further, the brightness adjustment coefficient of red, green, blue three kinds of colour light sources is obtained respectively according to the saturation degree coefficient of described luminance factor, described luminance factor proportion, described red, green, blue three kinds of colour light sources and the saturation degree coefficient proportion of described red, green, blue three kinds of colour light sources; Finally, the brightness adjustment value of three primary light source is obtained respectively by described brightness adjustment coefficient.
Wherein, the mode that described master controller obtains luminance factor according to the monochrome information of current display image can be:
1, maximum value process
First, described master controller obtains the brightness value of each pixel in every frame image information, then utilize brightness extraction algorithm according to the brightness value of described each pixel, obtain the maximum brightness value that maximum image gray scale is corresponding, and described maximum brightness value is defined as luminance factor.
Now lift an example and describe the process that described master controller utilizes brightness extraction algorithm acquisition luminance factor: described master controller obtains the brightness value of each pixel in current frame image information, the brightness value of more described each pixel, and the maximal value obtained wherein is I
255, described I
255the brightness value of a certain pixel when representing that gradation of image is 255, and the maximum gray scale of current frame image is L
max, be then L by gray scale
maxcorresponding brightness value I
maxas maximum brightness value, i.e. described luminance factor, wherein
2, weighted statistical method
Described master controller obtains the brightness value of each pixel in every frame image information, is added by the brightness value of described each pixel obtains luminance factor according to weight.
Such as, I is obtained by the gray scale of pixel each in every frame image information, brightness and pixel count by formula below
m, and by I
mbe defined as described luminance factor,
I
M＝N
0×I
0/N
All+N
1×I
1/N
All+N
2×I
2/N
All+…+N
255×I
255/N
All
Wherein, N
xfor pixel count when gray-scale value is X, N
allfor sum of all pixels, I
xfor brightness value when gray-scale value is X, X can be the arbitrary integer in 0-255, and M is maximum gradation value, I
mthe brightness value that maximum gradation value is corresponding.
Wherein, described master controller obtains the mode of the saturation degree coefficient of described three primary light source and can be according to the saturation infromation of current display image:
1, maximum value process
Described master controller obtains and analyzes the saturation degree of each pixel in every frame image information, obtain the maximum saturation corresponding to three primary colours respectively by the saturation infromation of described each pixel, the maximum saturation corresponding to described three primary colours is defined as respectively the saturation degree coefficient of three primary colours.
2, weighted average method
Described master controller obtains and analyzes the saturation degree of each pixel in every frame image information, and adds up each Pixel Information, utilizes average weighted method to obtain the saturation degree coefficient of three primary colours.
Concrete, after described master controller obtains the saturation degree coefficient of described luminance factor, described red, green, blue three kinds of colour light sources, the mode calculating the luminance factor of red, green, blue three kinds of colour light sources can be:
η
r＝α*η
1+β*η
rs
η
g＝α*η
1+β*η
gs
η
b＝α*η
1+β*η
bs
α+β＝1
Wherein, η
1represent described luminance factor, η
rs, η
gs, η
bsrepresent the saturation degree coefficient of the saturation degree coefficient of red light source, the saturation degree coefficient of green light source and blue-light source respectively, α represents described luminance factor proportion, and β represents described saturation degree coefficient proportion, η
rrepresent the brightness adjustment coefficient of red light source, η
grepresent the brightness adjustment coefficient of green light source, η
brepresent the brightness adjustment coefficient of blue-light source.
Described master controller utilizes the brightness adjustment coefficient η of described red light source
r, green light source brightness adjustment coefficient η
gand the brightness adjustment coefficient η of blue-light source
bthe brightness adjustment value of the brightness adjustment value of red light source, the brightness adjustment value of green light source and blue-light source can be obtained respectively by the mode of tabling look-up.
Step 14, brightness according to described three primary light source brightness adjustment value adjustment three primary light source.
Wherein, described master controller utilizes the brightness adjustment value of described red, green, blue three kinds of colour light sources to revise current light-source brightness value, obtain the control signal of corresponding red, green, blue three kinds of colour light sources, and described control signal is sent in light source driver module; Described light source driver module utilizes described control signal to adjust the brightness of red, green, blue three kinds of colour light sources respectively by the mode of the dutycycle of adjustment red, green, blue three kinds of colour light sources, wherein said control signal can be PWM (Pulse Width Modulation, pulse-length modulation) signal.
Due to the brightness adjustment value of the three primary light source that display device can match according to the acquisition of information of current display image and this display image, and adjust the brightness of current display image according to described brightness adjustment value, thus improve the contrast of current display image.Further, because described display device adjusts the brightness of three primary light source respectively, reduce current display image to the demand of brightness, thus reduce the power consumption of light source; Correspondingly, described display device also have adjusted the colour gamut of this display image, avoids the inadaptability that the large colour gamut light sources such as LASER bring to user.
As shown in Figure 2, the embodiment of the present invention two provides a kind of light-source brightness adjusting gear, comprising: receiving element 21, for receiving current display image; First acquiring unit 22, for obtaining monochrome information and the saturation infromation of described current display image; Second acquisition unit 23, for obtaining according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image; Adjustment unit 24, for the brightness according to described three primary light source brightness adjustment value adjustment three primary light source.
Wherein, described first acquiring unit 22 comprises: modular converter, for described current display image is converted to HSI color space by rgb color space; Data obtaining module, for obtaining monochrome information and the saturation infromation of the current display image with described HSI color space.
Described second acquisition unit 23 comprises: processing module, for analyzing described monochrome information and saturation infromation, obtains the saturation degree coefficient of luminance factor and red, green, blue three kinds of colour light sources; First acquisition module, for the saturation degree coefficient proportion by described current display Image Acquisition luminance factor proportion and red, green, blue three kinds of colour light sources; Second acquisition module, for obtaining the brightness adjustment coefficient of red, green, blue three kinds of colour light sources respectively according to the saturation degree coefficient of described luminance factor, described luminance factor proportion, described red, green, blue three kinds of colour light sources and the saturation degree coefficient proportion of described red, green, blue three kinds of colour light sources; 3rd acquisition module, for being obtained the brightness adjustment value of red, green, blue three kinds of colour light sources respectively by described brightness adjustment coefficient.
In the present embodiment, described adjustment unit 24 comprises: signal acquisition module, for being obtained the control signal of red, green, blue three kinds of colour light sources respectively by the brightness adjustment value of described red, green, blue three kinds of colour light sources; Adjusting module, for the brightness utilizing described control signal to adjust red, green, blue three kinds of colour light sources respectively.
The principle of work of described light-source brightness adjusting gear can with reference to the description in preceding method embodiment.
Due to the brightness adjustment value of the three primary light source that light-source brightness adjusting gear can match according to the acquisition of information of current display image and this display image, and adjust the brightness of current display image according to described brightness adjustment value, thus improve the contrast of current display image.Further, because described display device adjusts the brightness of three primary light source respectively, reduce current display image to the demand of brightness, thus reduce the power consumption of light source; Correspondingly, described display device also have adjusted the colour gamut of this display image, avoids the inadaptability that the large colour gamut light sources such as LASER bring to user.
A kind of display device, comprising: the light-source brightness adjusting gear shown in Fig. 2.Wherein, described display device can be televisor, projector etc.
In addition, Fig. 3 shows the schematic diagram of light-source brightness adjustment System in embody rule, and this system comprises master control system 31, light-source system 32, light modulation system 33 and output system 34.
Wherein, described master control system 31 comprises video input module 311, for receiving current display image; Front end processing block 312, for being converted to the display image with HSI color space by current display image; Graphics Processing module 313, for obtaining monochrome information and the saturation infromation of described current display image, and obtains according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image.Described light-source system 32 comprises: light source driver module 321 and light source device 322, described light source driver module 321 specifically comprises drived control IC (Integrated circuit, integrated circuit) and driving circuit, the three tunnel control signals obtained by described three primary light source brightness adjustment value received are utilized to drive described light source device 322, to complete the adjustment of the brightness to three primary light source.Described light modulation system comprises 33: photomodulator driver module 331 and photomodulator 332, described photomodulator driver module 331 receives the graphics control signals from described Graphics Processing module 313, and controlling according to described graphics control signals the state that described photomodulator 332 changes light source, the light source through changing enters output system 34.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (8)
1. a method for adjusting brightness of light source, is characterized in that, comprising:
Receive current display image;
Obtain monochrome information and the saturation infromation of described current display image;
The three primary light source brightness adjustment value matched with described current display image is obtained according to described monochrome information and saturation infromation;
According to the brightness of described three primary light source brightness adjustment value adjustment three primary light source;
Wherein, describedly obtain according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image and comprise:
Analyze described monochrome information and saturation infromation, obtain luminance factor and obtain the saturation degree coefficient of red, green, blue three kinds of colour light sources respectively; By described current display Image Acquisition luminance factor proportion and the saturation degree coefficient proportion obtaining red, green, blue three kinds of colour light sources respectively; The brightness adjustment coefficient of red, green, blue three kinds of colour light sources is obtained respectively according to the saturation degree coefficient of described luminance factor, described luminance factor proportion, described red, green, blue three kinds of colour light sources and the saturation degree coefficient proportion of described red, green, blue three kinds of colour light sources; The brightness adjustment value of red, green, blue three kinds of colour light sources is obtained respectively by described brightness adjustment coefficient.
2. method according to claim 1, it is characterized in that, the described mode obtaining the brightness adjustment coefficient of red, green, blue three kinds of colour light sources respectively according to the saturation degree coefficient of described luminance factor, described luminance factor proportion, described red, green, blue three kinds of colour light sources and the saturation degree coefficient proportion of described red, green, blue three kinds of colour light sources is:
η
r＝α*η
l+β*η
rs
η
g＝α*η
l+β*η
gs
η
b＝α*η
l+β*η
bs
α+β＝1
Wherein, η
1represent described luminance factor, η
rs, η
gs, η
bsrepresent the saturation degree coefficient of the saturation degree coefficient of red light source, the saturation degree coefficient of green light source and blue-light source respectively, α represents described luminance factor proportion, and β represents described saturation degree coefficient proportion, η
rrepresent the brightness adjustment coefficient of red light source, η
grepresent the brightness adjustment coefficient of green light source, η
brepresent the brightness adjustment coefficient of blue-light source.
3. method according to claim 1, is characterized in that, monochrome information and the saturation infromation of the described current display image of described acquisition comprise:
Described current display image is converted to brightness, saturation degree, colorfulness HSI color space by RGB rgb color space;
Obtain monochrome information and the saturation infromation with the current display image of described HSI color space.
4. method according to claim 1, is characterized in that, the described brightness according to described three primary light source brightness adjustment value adjustment three primary light source comprises:
The control signal of red, green, blue three kinds of colour light sources is obtained respectively by described red, green, blue three kinds of colour light source brightness adjustment values;
The control signal of described red, green, blue three kinds of colour light sources is utilized to adjust the brightness of red, green, blue three kinds of colour light sources respectively.
5. a light-source brightness adjusting gear, is characterized in that, comprising:
Receiving element, for receiving current display image;
First acquiring unit, for obtaining monochrome information and the saturation infromation of described current display image;
Second acquisition unit, for obtaining according to described monochrome information and saturation infromation the three primary light source brightness adjustment value matched with described current display image;
Adjustment unit, for the brightness according to described three primary light source brightness adjustment value adjustment three primary light source;
Wherein, described second acquisition unit comprises: processing module, for analyzing described monochrome information and saturation infromation, obtains the saturation degree coefficient of luminance factor and red, green, blue three kinds of colour light sources; First acquisition module, for the saturation degree coefficient proportion by described current display Image Acquisition luminance factor proportion and red, green, blue three kinds of colour light sources; Second acquisition module, for obtaining the brightness adjustment coefficient of red, green, blue three kinds of colour light sources respectively according to the saturation degree coefficient of described luminance factor, described luminance factor proportion, described red, green, blue three kinds of colour light sources and the saturation degree coefficient proportion of described red, green, blue three kinds of colour light sources; 3rd acquisition module, for being obtained the brightness adjustment value of red, green, blue three kinds of colour light sources respectively by described brightness adjustment coefficient.
6. device according to claim 5, is characterized in that, described first acquiring unit comprises:
Modular converter, for being converted to HSI color space by described current display image by rgb color space;
Data obtaining module, for obtaining monochrome information and the saturation infromation of the current display image with described HSI color space.
7. device according to claim 5, is characterized in that, described adjustment unit comprises:
Signal acquisition module, for being obtained the control signal of red, green, blue three kinds of colour light sources respectively by the brightness adjustment value of described red, green, blue three kinds of colour light sources;
Adjusting module, for the brightness utilizing described control signal to adjust red, green, blue three kinds of colour light sources respectively.
8. a display device, is characterized in that, comprising: the arbitrary described light-source brightness adjusting gear of claim 5-7.
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