CN103456280A - Method for displaying RGB color image - Google Patents

Abstract

The invention relates to a method for displaying an RGB color image. The method comprises the steps that the RGB color image is converted into an RGBW color image; the converted RGBW color image is displayed on a display; the RGB color image has RGB image pixels with first density; the RGBW color image has RGBW image pixels with the first density; the electronic paper display has display pixels with second density; the first density is larger than or equal to the second density. According to the method for displaying the RGB color image, the RGB color image is displayed after being converted into the RGBW color image, so that the display luminance is increased. Due to the fact that for different display sub-pixels, corresponding RGBW image pixel values of different adjacent areas are adopted, and for the strength of all RGBW image sub-pixels in corresponding areas, different weight numbers are adopted to construct strength functions of corresponding display sub-pixels, image display effects required by different kinds of display can be met, and the display quality of the image is improved.

Description

The method that shows the RGB coloured image

Technical field

The present invention relates to image and process, relate in particular to the method that shows the RGB coloured image.

Background technology

The visual experience that image shows is the importance that the user selects display, and for the display effect of image, color and brightness be the most intuitively, the factor the most easily experienced by human eye., there is the defect of luminance shortage at present widely used display device, particularly portable sets such as mobile phone, notebook computer more.And to improve the brightness of demonstration, and enlarging colour gamut and will increase power consumption, this is fatal for portable set.

In addition, display, when showing image, needs the picture element density of the picture element density of image and arrangement mode and display and arrangement mode is identical just can realize.So, just need to image be correspondingly processed according to the pixel standard of used display when different when the picture element density of the picture element density of piece image and arrangement mode and used display and arrangement mode.For example, in some situation, the picture element density of image is greater than the picture element density of display used, after can being processed image by the mode that several image pixels is merged to the pixel (image Compression) that forms a demonstration image, then shown on this display.

As mentioned above, the problem that at present display need to solve is to strengthen display brightness under the prerequisite that does not increase power consumption, and the display effect that the image of arbitrary picture element density can be realized ideal on used display.

Summary of the invention

The objective of the invention is to strengthen the brightness that display shows the RGB coloured image.

For achieving the above object, the invention provides a kind of method of the RGB of demonstration coloured image.The method comprises:

Convert the RGB coloured image to the RGBW coloured image;

RGBW coloured image after conversion is shown on display;

Described RGB coloured image has the RGB image pixel of the first density; Described RGBW coloured image has the RGBW image pixel of the first density;

Described electric paper display has the display pixel of the second density; Described the first density is greater than or equal to described the second density.

The embodiment of the present invention is by after converting the RGB coloured image to the RGBW coloured image, and the recycling display is shown, has strengthened the brightness of display color display under the prerequisite that does not increase power consumption, and the application that coloured image is shown is more extensive.Due to difference is shown to sub-pixel adopts the corresponding RGBW image slices in different adjacent domains usually to build, and adopt the intensity of 4 RGBW image sub-pixels in respective regions is got to the method structure display pixel that different weights build the strength function of corresponding demonstration sub-pixel, can realize meeting the image display effect of different display requirements, the quality that image shows is improved.

The accompanying drawing explanation

The RGB coloured image pixel schematic diagram that Fig. 1 is the embodiment of the present invention;

The RGBW coloured image pixel schematic diagram that Fig. 2 is the embodiment of the present invention;

The display schematic diagram that Fig. 3 is the embodiment of the present invention;

Fig. 4 is that the display pixel of the display of the embodiment of the present invention is attached to the schematic diagram on the RGBW coloured image;

Fig. 5 A-D is built the schematic diagram of display pixel by RGBW coloured image pixel in the embodiment of the present invention.

Embodiment

Below by drawings and Examples, technical scheme of the present invention is described in further detail.

The embodiment of the present invention, by the RGB coloured image, increasing a white sub-pixels W, has strengthened display brightness, and adopts the method for rebuilding display pixel, has improved display quality.

The method of embodiment of the present invention color display comprises two steps:

Step 101, convert the RGB coloured image to the RGBW coloured image;

Step 102, by the conversion after the RGBW coloured image on display, shown.

Step 101 is specially as follows:

A given RGB coloured image, be illustrated in figure 1 the RGB coloured image pixel schematic diagram of the embodiment of the present invention.This coloured image has the RGB image pixel 11 of the first density, has shown the part of this image in figure, as comprised 36 RGB image pixels 11 in picture 10.Each RGB image pixel 11 comprises three RGB image sub-pixels, and the three primary colours of correspondence image are respectively: RGB the first image sub-pixel 111 has the first color; RGB the second image sub-pixel 112, have the second color; With RGB the 3rd image sub-pixel 113, there is the 3rd color.These three RGB image sub-pixel 111-113 are stack mutually spatially, and the first color, the second color and the 3rd color are different, have respectively the first color intensity, the second color intensity and the 3rd color intensity.In the present embodiment, the first color is red, and the second color is green, and the 3rd color is blue.

The value of supposing the sub-pixel of given RGB coloured image is respectively R ₀, G ₀, B ₀, extract the sub-pixel value of each pixel from this RGB coloured image, be respectively R ₀, G ₀, B ₀, according to R ₀, G ₀, B ₀value, extract the value of a W according to certain mode, as the value of RGBW white sub-pixels W, such as according to R ₀, G ₀, B ₀value and the definite funtcional relationship value that calculates W, and as primary colours of RGBW coloured image.Then according to the value of this RGBW white sub-pixels W and each RGB image sub-pixel R ₀, G ₀, B ₀the value funtcional relationship definite by another obtain the value of new R, G, B, as the value of the three primary colours of RGBW coloured image.Finally, the value of the value of the W obtained by extraction and the R calculated, G, B forms the RGBW coloured image after conversion jointly.

The RGBW coloured image pixel schematic diagram that Fig. 2 is the embodiment of the present invention.RGBW coloured image after this conversion has the RGBW image pixel 21 of first density identical with above-mentioned RGB coloured image, each RGBW image pixel 21 is RGBW the first image sub-pixel 211, RGBW the second image sub-pixel 212 and RGBW the 3rd image sub-pixel 213 except three RGBW image sub-pixels that three RGB image sub-pixel 111-113 variations that comprise in above-mentioned RGB coloured image get, also comprise RGBW the 4th image sub-pixel 214, it has the 4th color, is white.The brightness that this white RGBW image sub-pixel 214 shows for improving coloured image.So, add a white color component W on original RGB coloured image after, can improve the display brightness of image, but simultaneously the saturation degree of some color can reduce again, this just need to consider, and on the brightness of image and color, carries out a compromise variation.Therefore how to add this white color component to seem very important, this will have influence on final picture quality.The process that in the embodiment of the present invention, the RGB coloured image is converted to the RGBW coloured image adopts the method that directly produces white light by light source to add white sub-pixels, and lower group formula is the description of this algorithm, wherein R ₀, G ₀, B ₀be respectively the input value of RGB coloured image sub-pixel, the value of R, G, the B RGBW coloured image sub-pixel after for conversion, the value that W is the white sub-pixels that adds.

W ₀＝Min(Min(R ₀，G ₀，B ₀)，α×Max(R ₀，G ₀，B ₀))

R＝β×(R ₀-W ₀)

G＝β×(G ₀-W ₀)

B＝β×(B ₀-W ₀)

W＝γ×β×W ₀

Wherein, α, β, γ are adjustable parameter, and the value in the embodiment of the present invention is respectively: α ≈ 0.5, β ≈ 2, γ ≈ 1.

The RGBW transfer algorithm of the embodiment of the present invention directly produces white light by light source, the loss that the light of having avoided like this in the classic method filtering other colors from light through color filter is brought by color filter while producing, thus guarantee not cause the change of shade of color and saturation degree when brightness improves.Therefore the method for the embodiment of the present invention can in most of the cases increase the brightness of display, or is saving power consumption under equal brightness, and high-high brightness is performed to ultimate attainment that display can support.

In above-mentioned steps, while calculating the value of white sub-pixels W of each RGBW coloured image, sub-pixel in the given RGB coloured image used can, from different RGB image pixels, while specifically selecting, can decide the position in affiliated RGBW image pixel according to the W sub-pixel.

As mentioned above, the method of the embodiment of the present invention is by changing existing dot structure, increase again a W (in vain) sub-pixel on each existing RGB (RGB) sub-pixel structure, and former rgb signal is carried out forming the RGBW signal the conversion from the RGB system to the RGBW system, can, under the prerequisite that does not increase power consumption, improve the brightness that shows image.

Step 102 is specific as follows:

At first a given display is the display schematic diagram of the embodiment of the present invention as shown in Figure 3.Display pixel 31, the second density that display as shown in the figure has the second density are less than or equal to the first density of the RGBW coloured image after above-mentioned conversion.A part that has shown this display in figure, as 30 comprised 9 display pixels 31 in figure.Each display pixel 31 comprises 4 and shows sub-pixel, and each shows that sub-pixel is different, is respectively used to show any in the first, second, third and the 4th color.In the present embodiment, these four show that sub-pixel is respectively: first shows sub-pixel 311, for showing above-mentioned the first color (redness); Second shows sub-pixel 312, for showing above-mentioned the second color (green); The 3rd shows sub-pixel 313, for showing above-mentioned the 3rd color (blueness); With the 4th demonstration sub-pixel 314, for showing above-mentioned the 4th color (white).Each demonstration sub-pixel in display pixel is arranged by certain distribution mode on display, such as four demonstration sub-pixels are in line according to the order of sequence, perhaps according to the matrix of 2*2, line up two row, perhaps first shows that sub-pixel, second shows that sub-pixel and the 3rd shows that sub-pixel is in line, and the 4th shows that sub-pixel comes the second row.In the present embodiment, these four show that sub-pixel 311-314 setovers with the matrix arrangement mode space of 2*2, wherein, show that the position of sub-pixel 311,312,313 and 314 in this matrix is respectively (1,1), (1,2), (2,1) and (2,2).Each shows that sub-pixel has corresponding zone and area, and in the present embodiment, each shows that the sub-pixel region is square area, and has equal area.

Fig. 4 is that the display pixel of the display of the embodiment of the present invention is attached to the schematic diagram on the RGBW coloured image.As shown in FIG., each RGBW image pixel 21 corresponds to corresponding position and zone on display.When the second density of the display pixel had when display equals the first density of RGBW coloured image pixel, a display pixel of the corresponding display of each image pixel of this RGBW coloured image, therefore can directly show.When the second density of display display pixel is less than the first density of RGBW coloured image pixel, the image pixel of the corresponding a plurality of RGBW coloured images of a display pixel of this display, now in step 102, utilize before this display shows this RGBW coloured image, also need this RGBW coloured image is carried out to image Compression, it is compressed into display same pixel density and shows afterwards again.

As shown in Figure 4, a display pixel 31 of the embodiment of the present invention can cover 4 RGBW image pixels 21, and the first density that is to say RGBW image pixel 21 is 4 times of the second density of display pixel 31.So while showing in the use above-mentioned RGBW coloured image, after the information of 4 RGBW image pixels 21 need to being rebuild, be shown in a display pixel 31, each shows that the intensity of the corresponding RGBW image sub-pixel (211 or 212 or 213 or 214) of intensity in 4 RGBW image pixels 21 that build it of sub-pixel (311 or 312 or 313 or 314) decides.

4 bases that show sub-pixel 311-314 space biasing of the embodiment of the present invention based on each display pixel 31, when according to RGBW image pixel 21, building display pixel 31, each demonstration sub-pixel selects respectively the intensity level of the corresponding RGBW image sub-pixel in 4 RGBW image pixels 21 in zones of different to determine the intensity of this demonstration sub-pixel.The embodiment of the present invention has defined 4 zones, is respectively: first area, for comprising the first demonstration sub-pixel correspondence position on the RGBW coloured image in interior zone; Second area, for comprising the second demonstration sub-pixel correspondence position in interior zone on the RGBW coloured image; The 3rd zone, show that for comprising the 3rd on the RGBW coloured image sub-pixel correspondence position is in interior zone; The 4th zone, show that for comprising the 4th on the RGBW coloured image sub-pixel correspondence position is in interior zone.These 4 zones all comprise 4 RGBW image pixels, there is the shape identical with display pixel 31 and equal area, that is to say, build these 4 and different show that RGBW image pixel that sub-pixels choose is from different image-regions, but shape is identical, area is equal, is same as display pixel 31.

Fig. 5 A-D is built the schematic diagram of display pixel by RGBW coloured image pixel in the embodiment of the present invention.Each shows that the intensity of sub-pixel is the function about the intensity of the corresponding RGBW image sub-pixel in 4 RGBW image pixels in corresponding region.Particularly, while calculating the intensity that shows sub-pixel, can get different weights to each RGBW image sub-pixel in corresponding region according to the type that will show image and display requirement, thereby reach the display effect of expection, such as details or edge clear, color continuity are good without different effects such as sawtooth.Be the structure schematic diagram of the first demonstration sub-pixel 311 as shown in Figure 5A.In figure, first shows that 4 the RGBW image pixels 21 of sub-pixel 311 (redness) in first area 501 build, and intensity is the function about RGBW the first image sub-pixel 211 intensity in these 4 RGBW image pixels 21.In the present embodiment, first shows that the intensity of sub-pixel 311 is the mean value of these 4 RGBW the first image sub-pixel 211 intensity, is shown below:

${\stackrel{\&OverBar;}{R}}_{15}=\frac{{\mathrm{<figure-callout\; id="8"\; label="r"\; filenames="HDA00001714753600012.png,HDA00001714753600032.png"\; state="\{\{state\}\}">r</figure-callout>}}_8+{\mathrm{<figure-callout\; id="9"\; label="r"\; filenames="HDA00001714753600012.png,HDA00001714753600032.png"\; state="\{\{state\}\}">r</figure-callout>}}_9+{\mathrm{<figure-callout\; id="14"\; label="r"\; filenames="HDA00001714753600012.png,HDA00001714753600022.png"\; state="\{\{state\}\}">r</figure-callout>}}_{14}+{\mathrm{<figure-callout\; id="15"\; label="r"\; filenames="HDA00001714753600012.png,HDA00001714753600032.png"\; state="\{\{state\}\}">r</figure-callout>}}_{15}}{4},$

Be the structure schematic diagram of the second demonstration sub-pixel 312 as shown in Figure 5 B.In figure, second shows that 4 the RGBW image pixels 21 of sub-pixel 312 (green) in second area 502 build, and same as above, its intensity is the mean value of RGBW the second image sub-pixel 212 intensity in these 4 RGBW image pixels 21, is shown below:

${\stackrel{\&OverBar;}{G}}_{16}=\frac{{\mathrm{<figure-callout\; id="9"\; label="g"\; filenames="HDA00001714753600012.png,HDA00001714753600032.png"\; state="\{\{state\}\}">g</figure-callout>}}_9+{\mathrm{<figure-callout\; id="10"\; label="g"\; filenames="HDA00001714753600012.png,HDA00001714753600022.png"\; state="\{\{state\}\}">g</figure-callout>}}_{10}+{\mathrm{<figure-callout\; id="15"\; label="g"\; filenames="HDA00001714753600012.png,HDA00001714753600032.png"\; state="\{\{state\}\}">g</figure-callout>}}_{15}+{\mathrm{<figure-callout\; id="16"\; label="g"\; filenames="HDA00001714753600012.png,HDA00001714753600031.png"\; state="\{\{state\}\}">g</figure-callout>}}_{16}}{4},$

Be the structure schematic diagram of the 3rd demonstration sub-pixel 313 as shown in Figure 5 C.In figure, the 3rd shows that 4 the RGBW image pixels 21 of sub-pixel 313 (blueness) in the 3rd zone 503 build, and its intensity is the mean value of RGBW the 3rd image sub-pixel 213 intensity in these 4 RGBW image pixels 21, is shown below:

${\stackrel{\&OverBar;}{B}}_{21}=\frac{b_{14}+b_{15}+b_{20}+{\mathrm{<figure-callout\; id="21"\; label="b"\; filenames="HDA00001714753600012.png,HDA00001714753600022.png"\; state="\{\{state\}\}">b</figure-callout>}}_{21}}{4},$

Be the structure schematic diagram of the 4th demonstration sub-pixel 314 as shown in Figure 5 D.In figure, the 4th shows that 4 the RGBW image pixels 21 of sub-pixel 314 (green) in the 4th zone 504 build, and its intensity is the mean value of RGBW the 4th image sub-pixel 214 intensity in these 4 RGBW image pixels 21, is shown below:

${\stackrel{\&OverBar;}{W}}_{22}=\frac{w_{15}+w_{16}+w_{21}+w_{22}}{4},$

In above-mentioned steps 102, when building each demonstration sub-pixel, build corresponding demonstration sub-pixel owing to having adopted by the RGBW image pixel in the arest neighbors zone, the quality that image shows is improved, for example, avoided adopting image blurring and edge that traditional display packing causes the phenomenon of sawtooth to occur.

As mentioned above, the embodiment of the present invention is by after converting the RGB coloured image to the RGBW coloured image, the recycling display is shown, has strengthened the brightness of display color display under the prerequisite that does not increase power consumption, and the application that coloured image is shown is more extensive.Due to difference is shown to sub-pixel adopts the corresponding RGBW image slices in different adjacent domains usually to build, and adopt the intensity of 4 RGBW image sub-pixels in respective regions is got to the method structure display pixel that different weights build the strength function of corresponding demonstration sub-pixel, can realize meeting the image display effect of different display requirements, the quality that image shows is improved.

The professional should further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.

The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can use hardware, processor to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random access memory (RAM), internal memory, ROM (read-only memory) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.

Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (10)

1. a method that shows the RGB coloured image, is characterized in that, described method comprises:

Convert the RGB coloured image to the RGBW coloured image;

RGBW coloured image after conversion is shown on display;

Described RGB coloured image has the RGB image pixel of the first density; Described RGBW coloured image has the RGBW image pixel of the first density; Described display has the display pixel of the second density;

Described the first density is greater than or equal to described the second density.

2. method according to claim 1, it is characterized in that, if described the first density is greater than described the second density, before the described step that RGBW coloured image after changing is shown on display, also comprise described RGBW color image compression to the step of density into described the second density.

3. method according to claim 1, is characterized in that,

Described RGB coloured image comprises RGB the first image sub-pixel, RGB the second image sub-pixel and RGB the 3rd image sub-pixel; Described RGB the first image sub-pixel has the first color; Described RGB the second image sub-pixel has the second color; Described RGB the 3rd image sub-pixel has the 3rd color;

Described RGBW coloured image comprises RGBW the first image sub-pixel, RGBW the second image sub-pixel, RGBW the 3rd image sub-pixel and RGBW the 4th image sub-pixel; Described RGBW the first image sub-pixel has the first color; Described RGBW the second image sub-pixel has the second color; Described RGBW the 3rd image sub-pixel has the 3rd color; Described RGBW the 4th image sub-pixel has the 4th color; Described the 4th color is white, for improving display brightness.

4. method according to claim 1, is characterized in that, the described step that converts the RGB coloured image to the RGBW coloured image is specially,

Extract the sub-pixel value of each pixel from described RGB coloured image, be respectively R ₀, G ₀, B ₀, according to described R ₀, G ₀, B ₀value extract a W according to certain mode ₀value;

According to described W ₀value and each RGB image sub-pixel R ₀, G ₀, B ₀value, obtain the value of new R, G, B and W by a definite funtcional relationship, as the value of four sub-pixels of described RGBW coloured image.

5. method according to claim 1, is characterized in that, described display comprises that the first demonstration sub-pixel, second shows that sub-pixel, the 3rd shows that sub-pixel and the 4th shows sub-pixel;

Described first shows that sub-pixel is for showing described the first color; Described second shows that sub-pixel is for showing described the second color; The described the 3rd shows that sub-pixel is for showing described the 3rd color; The described the 4th shows that sub-pixel is for showing described the 4th color.

6. according to claim 1 and 3 described methods, it is characterized in that, the described step that converts the RGB coloured image to the RGBW coloured image comprises to described RGB coloured image increases the 4th an image sub-pixel, forms described RGBW coloured image.

7. according to claim 1 and 4 described methods, it is characterized in that, the described step that RGBW image after conversion is shown on display comprises:

Show that first shows sub-pixel;

Show that second shows sub-pixel;

Show that the 3rd shows sub-pixel;

Show that the 4th shows sub-pixel.

8. method according to claim 4, it is characterized in that, described first shows that sub-pixel, described second shows that sub-pixel, the described the 3rd shows that sub-pixel and the described the 4th shows that sub-pixel is in line according to the order of sequence, perhaps according to the matrix of 2*2, line up two row, perhaps described first shows that sub-pixel, described second shows that sub-pixel and the described the 3rd shows that sub-pixel is in line, and the described the 4th shows that sub-pixel comes the second row.

9. according to claim 2 and 7 described methods, it is characterized in that,

Described demonstration first shows that the demonstration intensity of sub-pixel is decided by the intensity of all RGBW the first image sub-pixel in first area;

Described demonstration second shows that the demonstration intensity of sub-pixel is decided by the intensity of all RGBW the second image sub-pixel in second area;

Described demonstration the 3rd shows that the demonstration intensity of sub-pixel is decided by the intensity of all RGBW the 3rd image sub-pixel in the 3rd zone;

Described demonstration the 4th shows that the demonstration intensity of sub-pixel is decided by the intensity of all RGBW the 4th image sub-pixel in the 4th zone;

Described first area is to comprise described first on described RGBW coloured image to show that the sub-pixel correspondence position is in interior zone; Described second area is to comprise described second on described RGBW coloured image to show that the sub-pixel correspondence position is in interior zone; Described the 3rd zone shows that for comprising the described the 3rd on described RGBW coloured image the sub-pixel correspondence position is in interior zone; Described the 4th zone shows that for comprising the described the 4th on described RGBW coloured image the sub-pixel correspondence position is in interior zone.

10. method according to claim 9, is characterized in that, described first area, described second area, described the 3rd zone is identical with described the 4th region shape, area equates, all comprise the described RGBW image pixel of similar number.

Images