CN100397477C - Image processing apparatus and method of improving brightness and image quality of display panel - Google Patents
Image processing apparatus and method of improving brightness and image quality of display panel Download PDFInfo
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Abstract
The present invention discloses a video processing device and method for improving the brightness and the video quality of a display panel. The device and method comprises a color distribution computation unit and a control factor value generation unit, wherein the color distribution computation unit judges and classifies the original video color data and then computes the proportion values of total input video color data in a second zone block. The control factor value generation unit determines the values of a switching control factor and a backlight brightness control factor according to the proportion values. The original input video color (RGB) data is switched into new video color (R'G'B'W') data by outputting the switching control factor to a value switching unit; the backlight brightness control factor is output to a backlight brightness control unit to control backlight brightness.
Description
Technical field
The present invention relates to a kind of image processor and method that improves display panel brightness and image quality, at a kind of RGBW color system under the condition of not sacrificing luminance blast, the color that still can show high-quality, keep the quality that image shows, reach the double brightness of increase, keep tone and colour saturation, keep the purpose that image contrast quality three has concurrently.
Background technology
Panel pixel is made up of 4 sub-pixels (sub pixel) in recent years, except ruddiness (R), green glow (G) and blue light (B), also has white light (W).The color system of this RGBW can improve the light service efficiency of LCD, and wherein this sub-pixel assortment mode as shown in Figures 1 and 2.
U.S. Pat 5,929 has proposed a kind of mode of RGB-to-RGBW image data numerical value conversion process in 843, as shown in Figure 3.Wherein, R, G, B are the colors of image input value, and R ', G ', B ', W ' are the colors of image output valve, and a minimum value extractor 11 is selected the value data W ' of W supervention light.The calculation mode is as follows:
R’＝R
G’＝G
B’＝B
W’＝min(R，G，B)
Because the sub-pixel of W part can increase the composition of colors of image RGB simultaneously, therefore, utilizes aforementioned algorithm can reach the effect of image brilliance blast.But the defective of this algorithm is to keep the tone and the colour saturation of image originally, this is because the recruitment of the RGB three coloured light compositions of colors of image is identical, originally therefore the RGB proportionate relationship of image might be changed, and its change can be understood by following equation:
R∶G∶B≠(R’+W’)∶(G’+W’)∶(B’+W’)
Therefore, if the RGB three coloured light ratios of image have been changed, will change the tone and the colour saturation of image.It is shown in Figure 4 (for relatively convenient that its color space synoptic diagram sees also, all color space synoptic diagram will be with two dimension (G, R) space representation), the A point is represented colors of image RGB originally among the figure, and the colors of image R ' G ' B ' of A ' some representative after this algorithm process is transformed into the path of A ' point not by initial point by A point among Fig. 4, though patent US 5,929,843 methods that proposed can increase brightness, but can't keep the tone and the colour saturation of color originally.
At U.S. Pat 5,929, though 843 can increase image brilliance and can't keep the originally tone of image and the defective of colour saturation.U.S. Pat 6,724 has proposed a kind of mode of novel RGB-to-RGBW image data numerical value conversion process in 934, and it is improved.
The employed mode of these US 6,724,934 patents is to do earlier to judge classification according to the RGB value data of image pixel relation, if value data returned at block one B1, as shown in Figure 5, then
W’＝min(2×R，2×G，2×B)
R’＝2×R-W’
G’＝2×G-W’
B’＝2×B-W’
The A point is represented colors of image RGB originally among Fig. 5, the colors of image R ' G ' B ' of A ' some representative after this algorithm process, and this A point is transformed into A ' point can reach the increase of 2 times of brightness, and keeps the tone and the colour saturation of color originally simultaneously.This is (R '+W ') because R: G: B=: (G '+W '): (B '+W ').
But, if after the RGB value data of image pixel pass ties up to the judgement classification, if returned at block two B2, as shown in Figure 6, then
s＝1+{min(R，G，B)/〔max(R，G，B)-min(R，G，B)〕}
W’＝min(s×R，s×G，s×B)
R’＝s×R-W’
G’＝s×G-W’
B’＝s×B-W’
The B point is represented colors of image RGB originally among Fig. 6, and the colors of image R ' G ' B ' of B ' some representative after this algorithm process can reach the increase of s times of brightness, and keeps the tone and the colour saturation of color originally simultaneously.Because R: G: B=(R '+W '): (G '+W '): (B '+W ').
But, though this U.S. Pat 6,724,934 algorithms that proposed can reach the effect of image brilliance blast, and keep the originally tone and the colour saturation of image, but the defective of this algorithm is that colors of image RGB is positioned at the degree that the brightness of block one B1 and block two B2 increases can be different, and the degree that chroma-luminance increases in block one B1 can equal 2, and the degree that chroma-luminance increases in block two B2 can equal s (wherein 1≤s≤2).Especially the degree that the chroma-luminance of some high brightness and high saturation increases in block two B2 can have very big difference with the degree that chroma-luminance in block one B1 increases.Because the degree that the chroma-luminance of some high brightness and high saturation increases in block two B2 can be near 1, but the degree of the brightness of the color in the block one increase can equal 2.
This can cause the excessive phenomenon of real-time contrast (simultaneous contrast) change of image, quality and effect that image shows have been destroyed, when especially image showed the white partially color of the color of some high brightness, high saturability and high brightness simultaneously, the overall image quality was ruined the most serious.
At aforesaid defective, Samsung reintroduces the paper of a piece " Implementation of RGBW Color System in TFT-LCDs " in the SID2004 meeting, a kind of adaptive gain in vain (Adaptive White Scaling, the calculation mode of RGB-to-RGBW image data numerical value conversion process AWS).
See also shown in Figure 7, default blast multiplying power w can deliver to a color distortion analyzer 22 earlier in input colors of image (RGB) originally, this color distortion analyzer 22 can calculate the color distortion value e of image blast front and back according to input colors of image (RGB) data and blast multiplying power w, if the color distortion value e that calculate this moment is greater than critical value, then a w regulator 23 can reduce blast multiplying power w, and new blast multiplying power w sent into this color distortion analyzer 22 again, recomputate this color distortion value e, according to this loop, this program can last till always that this color distortion value e just stops less than critical value, and this moment, this blast multiplying power w just can enter in the RGBW converter 21.
Like this, different image data (RGB) has different blast multiplying power w, all can maintain below the critical value in order to control the color distortion value e of different images before and after the blast, suppress some image blast after image contrast the excessive phenomenon of change in real time.
But the described calculation mode of this paper has following defective:
1, the color distortion value e before and after the necessary double counting image blast can adjust the blast multiplying power w that is suitable for importing image data (RGB) most, will expend complexity and a large amount of image calculating and hardware costs like this.
2, in order to reduce the color distortion value e before and after the image blast, and for image after improving the blast of input image contrasts the excessive phenomenon of change in real time, the calculation mode of this AWS must reach by reducing blast multiplying power w.That is to say, show the quality that contrasts, the brightness brightening effect that the system that can't keep is required though improved image.See also shown in Figure 8, displayable color space when being 2 (w=2) for script blast multiplying power w, but in order to reduce the color distortion value e of input image blast front and back, can reduce blast multiplying power w (as shown in Figure 9), even image is when showing the white partially color of the color of the high saturability of some high brightness and high brightness simultaneously, for image after suppressing blast contrasts the excessive phenomenon of change in real time, blast multiplying power w have to be forced down near 1 (as shown in figure 10), so almost lose the effect that improves the overall image chroma-luminance, can't reach increase brightness at all, keep tone and colour saturation, keep the purpose that image contrast quality three has concurrently.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the defective that exists in the above-mentioned prior art, and providing a kind of can improve the image processor and the method for the brightness of colors of image demonstration under the condition of the tone of keeping the script colors of image and colour saturation.
Image contrasts the excessive problem of change in real time after another object of the present invention is to overcome blast, image contrast of display quality and effect after the raising blast.
A further object of the present invention is to expend complexity and a large amount of images calculates and hardware cost, can effectively reduce the operand of image processing, saves the circuit hardware cost.
Another purpose of the present invention is under the condition of not sacrificing luminance blast, still can keep the quality that image shows, reaching increases double brightness, keeps tone and colour saturation, keeps the target of the demonstration high-quality color that image contrast quality three has concurrently.
The present invention is a kind of image processor that improves display panel brightness and image quality, can improve the RGBW color system apparatus and method of the light service efficiency of LCD, this device comprises: a color Distribution calculation unit, in order to colors of image data are originally calculated, calculate the ratio value that the colors of image data are positioned at block one or block two arbitrary block wherein, wherein, the RGB value data pass that is positioned at the color of block one is: and max (R, G, B)/min (R, G, B)≤2; And the RGB value data pass that is positioned at the color of block two is: and max (R, G, B)/min (R, G, B)＞2; One controlling elements numerical value generation unit in order to the input ratio value, and determines the numerical value of a conversion and control factor and backlight illumination controlling elements; One numerical value converting unit, the input conversion and control factor, and the numerical value converting unit is in order to be converted to new colors of image data with colors of image data originally; One backlight illumination control module, input backlight illumination controlling elements, and the backlight illumination control module is in order to the backlight illumination of control display panel.
This method comprises the steps, one color Distribution calculation unit calculates colors of image data originally, calculate the colors of image data and be positioned at the block one of color space or the ratio value of block two arbitrary block wherein, wherein, the RGB value data pass that is positioned at the color of block one is: and max (R, G, B)/min (R, G, B)≤2; And the RGB value data pass that is positioned at the color of block two is: and max (R, G, B)/min (R, G, B)＞2; Determine the numerical value of a conversion and control factor and backlight illumination controlling elements again according to ratio value by a controlling elements numerical value generation unit; One numerical value converting unit will be converted to new colors of image data according to the conversion and control factor and the colors of image data of importing originally; And a backlight illumination control module will be controlled the backlight illumination of display panel according to the backlight illumination controlling elements of input.
Can under the condition of the tone of keeping the script colors of image and colour saturation, improve the brightness that colors of image shows according to image processor of the present invention and method.
Description of drawings
Fig. 1 is the assortment synoptic diagram of sub-pixel of the RGBW of prior art.
Fig. 2 is another assortment synoptic diagram of sub-pixel of the RGBW of prior art.
Fig. 3 is US 5,929, the synoptic diagram of 843 image processing mode.
Fig. 4 is US 5,929,843 color space synoptic diagram.
Fig. 5 is US 6,724,934 color space synoptic diagram (value data is returned at block one).
Fig. 6 is US 6,724,934 color space synoptic diagram (value data is returned at block two).
Fig. 7 is the synoptic diagram of the image data numerical value conversion process mode that proposes of Samsung.
Fig. 8 is the color space synoptic diagram (w=2) of the processing mode that proposes of Samsung.
Fig. 9 is the color space synoptic diagram (w=1.6) of the processing mode that proposes of Samsung.
Figure 10 is the color space synoptic diagram (w=1.2) of the processing mode that proposes of Samsung.
Figure 11 is the synoptic diagram according to image processing mode of the present invention.
Figure 12 be according to color space synoptic diagram of the present invention (p=0, b=1).
Figure 13 be according to color space synoptic diagram of the present invention (p=0.4, b=1.4).
Figure 14 be according to color space synoptic diagram of the present invention (p=0.8, b=1.8).
Embodiment
Relevant detailed content of the present invention and technical descriptioon, existing accompanying drawings is as follows:
Seeing also shown in Figure 11ly, is the synoptic diagram of image processing mode of the present invention.One color Distribution calculation unit, 32 inputs colors of image RGB data originally, the color that this COLOR COMPOSITION THROUGH DISTRIBUTION computing unit 32 will be imported each pixel of image is judged classification, closing with the RGB value data of color is foundation, the relation that this color is positioned at color space is divided into block one B1 and block two B2 (as shown in figure 12), and calculates the ratio value that the input colors of image is positioned at block one B1 or block two B2 arbitrary block wherein (follow-up will at the ratio value p (0≤p≤1) of block two B2 the present invention be described to calculate the input colors of image).
The RGB value data pass that wherein is positioned at the color of block one B1 is: and max (R, G, B)/min (R, G, B)≤2; And the RGB value data pass that is positioned at the color of block two B2 is: and max (R, G, B)/min (R, G, B)＞2.Calculate again and all import the ratio value p of colors of image RGB data at block two B2, wherein p=(number of pixels of color position in block two B2)/(image total number-of-pixels).
One controlling elements numerical value generation unit (control variable generating unit) 33, the ratio value p that these controlling elements numerical value generation unit 33 meetings are exported according to this COLOR COMPOSITION THROUGH DISTRIBUTION computing unit 32 is to determine the numerical value of a conversion and control factor s and a backlight illumination controlling elements b.This conversion and control factor s can export a RGB-to-RGBW numerical value converting unit 31 to, and these backlight illumination controlling elements b can export a backlight illumination control module 34 to.(wherein the relation of this conversion and control factor s, backlight illumination controlling elements b and ratio value p can be as b=p+1; S=2/ (p+1); But this relation can be according to the product performance adjustment, and not as limit).
This numerical value converting unit 31 can be imported the conversion and control factor s of colors of image RGB data originally and 33 generations of this controlling elements numerical value generation unit, is that R, G, B are converted to colors of image output valve R ', G ', B ', W ' according to this conversion and control factor s (1≤s≤2) with the colors of image input value.If the color position of image pixel is at block one B1, then
W’＝min(s×R，s×G，s×B)
R’＝s×R-W’
G’＝s×G-W’
B’＝s×B-W’
If the color position of image pixel is at block two B2, then
k＝1+(s-1){min(R，G，B)/〔max(R，G，B)-min(R，G，B)〕}
W’＝min(k×R，k×G，k×B)
R’＝k×R-W’
G’＝k×G-W’
B’＝k×B-W’
Colors of image after this algorithm process can be kept the tone and the colour saturation of color originally.Because R: G: B=(R '+W '): (G '+W '): (B '+W ').
Again, this backlight illumination control module 34 is according to the backlight illumination controlling elements b (1≤b≤2) of input, in order to the backlight illumination of control display panel.When the b value is 1, backlight illumination is kept original value, and when the b value was 2, backlight illumination increased to the twice of original value.
See also Figure 12,, comply with aforesaid relational expression (b=p+1 for when input colors of image (p=0) displayable color space when the ratio value p of block two B2 is 0; S=2/ (p+1)), when ratio value p was 0, backlight illumination controlling elements b was 1, conversion and control factor s is 2, the color of representing import image this moment all is positioned at block one B1, and backlight illumination can be kept original value, and image can reach the effect that increases double brightness.
Please consult Figure 13 again,, comply with aforesaid relational expression (b=p+1 for when input colors of image (p=0.4) displayable color space when the ratio value p of block two B2 is 0.4; S=2/ (p+1)), when ratio value p was 0.4, backlight illumination controlling elements b was 1.4, and conversion and control factor s is 1.43, and what the color of representing import image this moment was positioned at block two B2 has 40%.Therefore, backlight illumination increases to initial 1.4 times, can improve the degree that the chroma-luminance in block two B2 increases, dwindle the difference that interior chroma-luminance increase degree of block two B2 and the interior chroma-luminance of block one B1 increase degree, and image still can reach the effect that double brightness increases.
Please consult Figure 14 again,, comply with aforesaid relational expression (b=p+1 for when input colors of image (p=0.8) displayable color space when the ratio value p of block two B2 is 0.8; S=2/ (p+1)), when ratio value p was 0.8, backlight illumination controlling elements b was 1.8, and conversion and control factor s is 1.11, and what the color of representing import image this moment was positioned at block two B2 has 80%.That is to say, the color of the most of ratio of input image is positioned at block two B2, so backlight illumination can be increased to initial 1.8 times, significantly to improve the degree of the chroma-luminance increase in block two B2, make that some high brightness also can be near 2 with the brightness increase degree of the color of high saturation in block two B2, the degree that the brightness of the color in block one B1 increases still can equal 2, can effectively dwindle the difference of chroma-luminance increase degree in block two B2 and block one B1 like this.By this except that image still can reach the effect that double brightness increases, also can keep the quality of the contrast of image brilliance before and after increasing simultaneously, can suppress blast effectively after image contrast the excessive phenomenon of change in real time.
Comprehensively aforementioned, the image processor that the present invention proposes is compared with the image processing mode of prior art with method and is had the following advantages:
1, the present invention can improve the brightness that colors of image shows under the condition of the tone of keeping the script colors of image and colour saturation.
2, the present invention can improve this U.S. Pat 6,724,934 defective, image contrasts the excessive problem of change in real time after overcoming blast, can improve image contrast of display quality and effect after the blast, when especially image showed the white partially color of the color of the high saturability of some high brightness and high brightness simultaneously, image quality can obtain significantly to improve.
3, the present invention compares with " Implementation of RGBW ColorSystem in TFT-LCDs " paper of Samsung, color distortion value e before and after the necessary double counting image blast of this paper, just can adjust the blast multiplying power w that is most suited to import image data, therefore need the image of large amount of complex to calculate and hardware cost.And image processor and method that the present invention proposes, only need the color RGB value data of input image is calculated once, be positioned at the wherein ratio value of arbitrary block of block one B1 or block two B2 in order to find out the input colors of image, can finish the data conversion treatment of RGB-to-RGBW, effectively reduce the operand of image processing, saved the circuit hardware cost.And the present invention is under the condition of not sacrificing luminance blast, still can keep the quality that image shows, reaching increases double brightness, keeps tone and colour saturation, keeps the purpose of the demonstration high-quality color that image contrast quality three has concurrently.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All in the spirit and principles in the present invention, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. image processor that improves display panel brightness and image quality is used to improve the RGBW color system of the light service efficiency of LCD, it is characterized in that described device comprises:
One color Distribution calculation unit (32), in order to colors of image data are originally calculated, calculate the ratio value that the colors of image data are positioned at block one (B1) or block two (B2) arbitrary block wherein, wherein, the RGB value data pass that is positioned at the color of described block one (B1) is: and max (R, G, B)/min (R, G, B)≤2; And the RGB value data pass that is positioned at the color of described block two (B2) is: and max (R, G, B)/min (R, G, B)＞2;
One controlling elements numerical value generation unit (33) in order to importing described ratio value (p), and determines the numerical value of a conversion and control factor (s) and backlight illumination controlling elements (b);
One numerical value converting unit (31) is imported the described conversion and control factor (s), and described numerical value converting unit (31) is in order to be converted to new colors of image data with colors of image data originally;
One backlight illumination control module (34) is imported described backlight illumination controlling elements (b), and described backlight illumination control module (34) is in order to the backlight illumination of control display panel.
2. image treatment method that improves display panel brightness and image quality is used to improve the light service efficiency of LCD, it is characterized in that described method comprises the steps:
One color Distribution calculation unit (32) calculates colors of image data originally, calculate the colors of image data and be positioned at the wherein ratio value of arbitrary block of the block one (B1) of color space or block two (B2), wherein, the RGB value data pass that is positioned at the color of described block one (B1) is: max (R, G, B)/and min (R, G, B)≤2; And the RGB value data pass that is positioned at the color of described block two (B2) is: and max (R, G, B)/min (R, G, B)＞2;
Determine the numerical value of a conversion and control factor (s) and backlight illumination controlling elements (b) again according to described ratio value by a controlling elements numerical value generation unit (33);
One numerical value converting unit (31) will be converted to new colors of image data according to the described conversion and control factor (s) and the colors of image data of importing originally;
And a backlight illumination control module (34) will be controlled the backlight illumination of display panel according to the backlight illumination controlling elements (b) of input.
3. image treatment method according to claim 2 is characterized in that, described ratio value (p) is meant that color is positioned at the number of pixels and the image total pixel number purpose ratio of block two (B2).
4. image treatment method according to claim 2, it is characterized in that, when color was positioned at the described block one (B1) of color space, described numerical value converting unit (31) according to the relational expression that the colors of image RGB data of the described conversion and control factor (s) and input originally are converted to a new colors of image R ' G ' B ' W ' was:
W’＝min(s×R，s×G，s×B)；
R’＝s×R-W’；
G’＝s×G-W’；
B’＝s×B-W’。
Wherein, S is determined by described ratio value (P).
5. image treatment method according to claim 2, it is characterized in that, when color was positioned at the described block two (B2) of color space, described numerical value converting unit (31) according to the relational expression that the colors of image RGB data of the described conversion and control factor (s) and input originally are converted to a new colors of image R ' G ' B ' W ' was:
k＝1+(s-1){min(R，G，B)/〔max(R，G，B)-min(R，G，B)〕}；
W’＝min(k×R，k×G，k×B)；
R’＝k×R-W’；
G’＝k×G-W’；
B’＝k×B-W’。
6. image treatment method according to claim 3 is characterized in that, described ratio value p satisfies: 0≤p≤1.
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| US6115016A (en) * | 1997-07-30 | 2000-09-05 | Fujitsu Limited | Liquid crystal displaying apparatus and displaying control method therefor |
| JP2000180825A (en) * | 1998-12-15 | 2000-06-30 | Fujitsu Ltd | Liquid crystal display device |
| US6724934B1 (en) * | 1999-10-08 | 2004-04-20 | Samsung Electronics Co., Ltd. | Method and apparatus for generating white component and controlling the brightness in display devices |
| EP1194917A2 (en) * | 1999-11-12 | 2002-04-10 | Koninklijke Philips Electronics N.V. | Liquid crystal display apparatus with improved luminance control |
| JP2002014660A (en) * | 2000-06-29 | 2002-01-18 | Victor Co Of Japan Ltd | Liquid crystal display device |
| US20030117364A1 (en) * | 2001-12-25 | 2003-06-26 | Advanced Display Inc. | Liquid crystal display device |
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| WO2004070699A1 (en) * | 2003-02-07 | 2004-08-19 | Sanyo Electric Co., Ltd. | Color space correction circuit in display device |
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