WO2018170978A1 - 一种像素渲染方法及像素渲染装置 - Google Patents
一种像素渲染方法及像素渲染装置 Download PDFInfo
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- WO2018170978A1 WO2018170978A1 PCT/CN2017/080948 CN2017080948W WO2018170978A1 WO 2018170978 A1 WO2018170978 A1 WO 2018170978A1 CN 2017080948 W CN2017080948 W CN 2017080948W WO 2018170978 A1 WO2018170978 A1 WO 2018170978A1
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/10—Intensity circuits
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- the present invention relates to the field of liquid crystal display, and in particular, to a pixel rendering method and a pixel rendering device.
- the RGBW display includes white (W) sub-pixels in addition to the red (R) sub-pixel, the green (G) sub-pixel, and the blue (B) sub-pixel, and the white sub-pixel can be added.
- RGBW adds a W sub-pixel, which will bring about a decline in physical resolution. Therefore, in the RGBW display device, in order to improve the actual resolution of the display, a sub-pixel rendering method (sub-pixel) is required. Rendering, SPR).
- the object of the present invention is to provide a pixel rendering method and a pixel rendering device, which can easily reduce the actual resolution of the display when the pixel is rendered in the prior art, and some sub-pixel information is easily lost, and the text display brightness is insufficient. Not clear, and the picture is not smooth enough.
- a pixel rendering method comprising the following steps:
- the rendering is performed according to the text display mode, otherwise the rendering is performed according to the image display mode;
- the luminance values of the normalized RGB three primary color components are converted into their corresponding RGBW luminance values, and are calculated according to the following formula:
- G1 k*G0-W0
- B1 k*B0-W0
- k is the gain coefficient
- W1, R1, G1, and B1 are the luminance values of the converted RGBW, respectively
- R0, G0, and B0 are the luminance values of RGB before the transition
- Wmax is the W subpixel. The maximum brightness value.
- the determining whether the display mode of the pixel to be rendered is a text display mode comprises:
- the display mode of the pixel to be rendered is a text display mode, otherwise, the display mode of the pixel to be rendered is determined to be a picture display mode.
- the rendering according to the picture display mode comprises:
- G1out (G1+G2+G3)/3
- B1out (B1+B2+B3)/3
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the luminance values of the B sub-pixels, W3, R3, G3, and B3 are luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the third pixel, respectively.
- the performing the pixel rendering according to the text display mode comprises:
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- the performing the pixel rendering according to the picture display mode comprises:
- W1out a1*W1+a2*W2+a3*W3
- R1out a1*R1+a2*R2+a3*R3
- G1out a1*G1+a2*G2+a3*G3
- B1out a1*B1+a2*B2+a3*B3
- W1out, R1out, G1out and B1out are respectively The brightness values of the rendered W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel are rendered, and W1, R1, G1, and B1 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the first pixel.
- the luminance values of the pixels and the B sub-pixels, W2, R2, G2, and B2 are the luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the second pixel, respectively, W3, R3, G3, and B3
- the performing the pixel rendering according to the text display mode comprises:
- G1out min ⁇ (G1+P2)/2,1 ⁇
- B1out min ⁇ (B1+P2)/2,1 ⁇
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the pixel to be rendered, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- a pixel rendering device comprising:
- a grayscale value obtaining module configured to obtain grayscale values of RGB three primary color components of each pixel of the original image
- a first conversion module configured to convert a grayscale value of the RGB three primary color components into a normalized luminance value
- a second conversion module configured to convert a luminance value of the normalized RGB three primary color components into a luminance value of the corresponding RGBW;
- a mode determining module configured to determine whether a display mode of the pixel to be rendered is a text display mode
- a text rendering module configured to perform rendering according to a text display mode when a display mode of the pixel to be rendered is a text display mode
- a picture rendering module configured to: when the display mode of the pixel to be rendered is a picture display mode, and render according to a picture display mode;
- a conversion output module configured to convert the brightness value of the rendered pixel to be rendered into its corresponding grayscale value for output.
- the mode determining module comprises:
- a difference obtaining unit configured to acquire a luminance difference value and a saturation difference value between two left and right adjacent pixels of the pixel to be rendered
- a value comparison unit configured to compare the brightness difference value with a preset brightness difference threshold value, and compare the saturation difference value with a preset saturation difference threshold value
- a mode determining unit configured to: when the brightness difference value is greater than the preset brightness difference threshold, and the saturation difference value is greater than the preset saturation difference threshold, determining that the display mode of the pixel to be rendered is a text Display mode, otherwise it is determined that the display mode of the pixel to be rendered is a picture display mode.
- a pixel rendering method comprising the following steps:
- the rendering is performed according to the text display mode, otherwise the rendering is performed according to the image display mode;
- the brightness value of the normalized RGB three primary color components is converted into the brightness value of the corresponding RGBW, and is calculated according to the following formula:
- G1 k*G0-W0
- B1 k*B0-W0
- k is the gain coefficient
- W1, R1, G1, and B1 are the luminance values of the converted RGBW, respectively
- R0, G0, and B0 are the luminance values of RGB before the transition
- Wmax is the W subpixel. Maximum brightness value
- the determining whether the display mode of the pixel to be rendered is a text display mode includes:
- the display mode of the pixel to be rendered is a text display mode, otherwise, the display mode of the pixel to be rendered is determined to be a picture display mode.
- the rendering according to the picture display mode comprises:
- G1out (G1+G2+G3)/3
- B1out (B1+B2+B3)/3
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the luminance values of the B sub-pixels, W3, R3, G3, and B3 are luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the third pixel, respectively.
- the performing the pixel rendering according to the text display mode comprises:
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- the performing the pixel rendering according to the picture display mode comprises:
- W1out a1*W1+a2*W2+a3*W3
- R1out a1*R1+a2*R2+a3*R3
- G1out a1*G1+a2*G2+a3*G3
- B1out a1*B1+a2*B2+a3*B3
- W1out, R1out, G1out and B1out are respectively The brightness values of the rendered W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel are rendered, and W1, R1, G1, and B1 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the first pixel.
- the luminance values of the pixels and the B sub-pixels, W2, R2, G2, and B2 are the luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the second pixel, respectively, W3, R3, G3, and B3
- the performing the pixel rendering according to the text display mode comprises:
- G1out min ⁇ (G1+P2)/2,1 ⁇
- B1out min ⁇ (B1+P2)/2,1 ⁇
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the pixel to be rendered, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- the present invention discloses a pixel rendering method and a pixel rendering device.
- the display mode of the pixel to be rendered is a text display mode
- the rendering mode is performed according to the text display mode. Otherwise, rendering in the image display mode has the following advantages:
- the present invention can ensure that the actual resolution is not lowered in the case where the physical resolution of the display panel is degraded.
- the present invention judges the display mode of the pixel to be rendered, and performs different processing on the display modes of the text and the picture respectively.
- the result of the picture processing is to make the picture display effect smoother, especially in the aspect of portrait display.
- the display is better, and the result of word processing is to make the text display black and white gap increase, and the details are sharper.
- FIG. 1 is a flowchart of an overall implementation procedure of a pixel rendering method according to an embodiment of the present invention
- FIG. 2 is a flowchart of an implementation step of determining whether a display mode of a pixel to be rendered is a text display mode according to a pixel rendering method according to an embodiment of the present invention
- FIG. 3 is a schematic diagram of an overall structure of a pixel rendering apparatus according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram of an overall structure of a mode judging module of a pixel rendering apparatus according to an embodiment of the present invention.
- FIG. 1 is a flowchart of an overall implementation step of a pixel rendering method according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram of determining, by using a pixel rendering method, a display mode of a pixel to be rendered. A flow chart of the implementation steps for the text display mode.
- a pixel rendering method of the present invention includes:
- a pixel rendering method comprising the following steps:
- Step S101 Acquire a grayscale value of the RGB three primary color components of each pixel of the original image, and convert it into a normalized luminance value.
- the grayscale value of the RGB three primary color components of each pixel of the original image is converted into the normalized luminance value by using the De-Gamma conversion method. Specifically, the following formula is used for calculation:
- y1 represents the luminance value of the normalized RGBW
- x1 represents the grayscale value of the RGB before normalization
- Step S102 Convert the luminance values of the normalized RGB three primary color components into their corresponding RGBW luminance values.
- Step S103 determining whether the display mode of the pixel to be rendered is a text display mode.
- Step S104 If the display mode of the pixel to be rendered is a text display mode, the rendering is performed according to the text display mode.
- Step S105 If the display mode of the pixel to be rendered is a picture display mode, the rendering is performed according to the picture display mode.
- Step S106 Convert the brightness value of the rendered pixel to be rendered into its corresponding grayscale value for output.
- the luminance value of the rendered pixel to be rendered is converted into its corresponding grayscale value by using a Gamma conversion method, as follows:
- y2 represents the grayscale value of the converted RGBW
- x2 represents the luminance value of the RGBW before the conversion.
- the luminance values of the normalized RGB three primary color components are converted into the luminance values of the corresponding RGBWs, and are calculated according to the following formula:
- G1 k*G0-W0
- B1 k*B0-W0
- k is the gain coefficient
- W1, R1, G1, and B1 are the luminance values of the converted RGBW, respectively
- R0, G0, and B0 are the luminance values of RGB before the transition
- Wmax is the W subpixel. The maximum brightness value.
- the determining whether the display mode of the pixel to be rendered is a text display mode includes:
- Step S201 Acquire a luminance difference value and a saturation difference value between two left and right adjacent pixels of the pixel to be rendered.
- Step S202 Compare the brightness difference value with a preset brightness difference threshold value, and compare the saturation difference value with a preset saturation difference threshold value.
- Step S203 Determine whether the brightness difference value is greater than the preset brightness difference threshold, and whether the saturation difference value is greater than the preset saturation difference threshold.
- Step S204 If the brightness difference value is greater than the preset brightness difference threshold, and the saturation difference value is greater than the preset saturation difference threshold, determine that the display mode of the pixel to be rendered is a text display mode.
- Step S205 If the brightness difference value is greater than the preset brightness difference threshold, and the saturation difference value is greater than the preset saturation difference threshold, the display mode of the pixel to be rendered is determined to be a picture display. mode.
- the rendering according to the picture display mode includes:
- G1out (G1+G2+G3)/3
- B1out (B1+B2+B3)/3
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the luminance values of the B sub-pixels, W3, R3, G3, and B3 are luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the third pixel, respectively.
- the performing pixel rendering according to the text display mode specifically includes:
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the first pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- the first pixel is the pixel to be rendered, and is calculated according to the following formula:
- W1out, R1out, G1out, and B1out are respectively brightness values of the W sub-pixel, R sub-pixel, G sub-pixel, and B sub-pixel after the first pixel to be rendered, W2out, R2out, G2out, and B2out respectively
- W1, R1, G1, and B1 are respectively W sub-pixels of the first pixel.
- the luminance values of the R color sub-pixel, the G color sub-pixel, and the B color sub-pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R-color sub-pixel, the G-color sub-pixel, and the B color of the second pixel.
- the luminance values of the sub-pixels, W3, R3, G3, and B3 are the luminance values of the W sub-pixel, the R-color sub-pixel, the G-color sub-pixel, and the B-color sub-pixel of the right pixel, respectively, and W4, R4, G4, and B4, respectively.
- the pixel rendering method of the present invention determines whether the display mode of the pixel to be rendered is a text display mode. If the display mode of the pixel to be rendered is a text display mode, the rendering is performed according to the text display mode, otherwise, according to the image display mode. Rendering has the following advantages:
- the present invention can ensure that the actual resolution is not lowered in the case where the physical resolution of the display panel is degraded.
- the present invention judges the display mode of the pixel to be rendered, and performs different processing on the display modes of the text and the picture respectively.
- the result of the picture processing is to make the picture display effect smoother, especially in the aspect of portrait display.
- the display is better, and the result of word processing is to make the text display black and white gap increase, and the details are sharper.
- This embodiment is mostly the same as the content of the first embodiment, and the different parts are as follows:
- the pixel rendering according to the text display mode in the embodiment is different from the method in the first embodiment, and specifically includes:
- W1out a1*W1+a2*W2+a3*W3
- R1out a1*R1+a2*R2+a3*R3
- G1out a1*G1+a2*G2+a3*G3
- B1out a1*B1+a2*B2+a3*B3
- W1out, R1out, G1out and B1out are respectively The brightness values of the rendered W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel are rendered, and W1, R1, G1, and B1 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the first pixel.
- the luminance values of the pixels and the B sub-pixels, W2, R2, G2, and B2 are the luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the second pixel, respectively, W3, R3, G3, and B3
- the pixel rendering according to the text display mode is different from the first embodiment, and specifically includes:
- G1out min ⁇ (G1+P2)/2,1 ⁇
- B1out min ⁇ (B1+P2)/2,1 ⁇
- W1out, R1out, G1out, and B1out are brightness values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel after the pixel to be rendered is respectively rendered, and W1, R1, G1, and B1 are respectively The luminance values of the W sub-pixel, the R sub-pixel, the G sub-pixel, and the B sub-pixel of the pixel to be rendered, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R sub-pixel, and the G sub-pixel of the second pixel.
- the brightness value of the B sub-pixel is the brightness value of the B sub-pixel.
- the first pixel is the pixel to be rendered, and is calculated according to the following formula:
- G2out min ⁇ (G3+P4)/2,1 ⁇
- B2out min ⁇ (B3+P4)/2,1 ⁇
- W1out, R1out, G1out, and B1out are respectively brightness values of the W sub-pixel, R sub-pixel, G sub-pixel, and B sub-pixel after the first pixel to be rendered, W2out, R2out, G2out, and B2out respectively
- W1, R1, G1, and B1 are respectively W sub-pixels of the pixel to be rendered.
- the luminance values of the R color sub-pixel, the G color sub-pixel, and the B color sub-pixel, and W2, R2, G2, and B2 are respectively the W sub-pixel, the R-color sub-pixel, the G-color sub-pixel, and the B color of the second pixel.
- the luminance values of the sub-pixels, W3, R3, G3, and B3 are the luminance values of the W sub-pixel, the R-color sub-pixel, the G-color sub-pixel, and the B-color sub-pixel of the third pixel, respectively, W4, R4, G4, and B4.
- the pixel rendering method of the present invention determines whether the display mode of the pixel to be rendered is a text display mode. If the display mode of the pixel to be rendered is a text display mode, the rendering is performed according to the text display mode, otherwise, according to the image display mode. Rendering has the following advantages:
- the present invention can ensure that the actual resolution is not lowered in the case where the physical resolution of the display panel is degraded.
- the present invention judges the display mode of the pixel to be rendered, and performs different processing on the display modes of the text and the picture respectively.
- the result of the picture processing is to make the picture display effect smoother, especially in the aspect of portrait display.
- the display is better, and the result of word processing is to make the text display black and white gap increase, and the details are sharper.
- FIG. 3 is a schematic diagram of an overall structure of a pixel rendering apparatus 10 according to an embodiment of the present invention.
- FIG. 4 is a schematic diagram of an overall structure of a mode determining module 104 of a pixel rendering apparatus 10 according to an embodiment of the present invention.
- a pixel rendering apparatus 10 of the present invention includes:
- the grayscale value obtaining module 101 is configured to acquire grayscale values of RGB three primary color components of each pixel of the original image.
- the first conversion module 102 is configured to convert the grayscale values of the RGB three primary color components into normalized luminance values.
- the second conversion module 103 is configured to convert the luminance values of the normalized RGB three primary color components into their corresponding RGBW luminance values.
- the mode determining module 104 is configured to determine whether the display mode of the pixel to be rendered is a text display mode.
- the text rendering module 105 is configured to perform rendering according to the text display mode when the display mode of the pixel to be rendered is a text display mode.
- the picture rendering module 106 is configured to perform rendering according to the picture display mode when the display mode of the pixel to be rendered is a picture display mode.
- the conversion output module 107 is configured to convert the brightness value of the rendered pixel to be rendered into its corresponding grayscale value for output.
- the mode determining module 104 includes:
- the difference obtaining unit 114 is configured to acquire a luminance difference value and a saturation difference value between two left and right adjacent pixels of the pixel to be rendered.
- the value comparison unit 124 is configured to compare the brightness difference value with a preset brightness difference threshold value, and compare the saturation difference value with a preset saturation difference threshold value.
- the mode determining unit 134 is configured to: when the brightness difference value is greater than the preset brightness difference threshold, and the saturation difference value is greater than the preset saturation difference threshold, determine that the display mode of the pixel to be rendered is The text display mode, otherwise the display mode of the pixel to be rendered is determined to be a picture display mode.
- the pixel rendering device 10 of the present invention determines whether the display mode of the pixel to be rendered is a text display mode, and if the display mode of the pixel to be rendered is a text display mode, the rendering is performed according to the text display mode, otherwise, the image is displayed according to the image.
- the mode is rendered with the following advantages:
- the present invention can ensure that the actual resolution is not lowered in the case where the physical resolution of the display panel is degraded.
- the present invention judges the display mode of the pixel to be rendered, and performs different processing on the display modes of the text and the picture respectively.
- the result of the picture processing is to make the picture display effect smoother, especially in the aspect of portrait display.
- the display is better, and the result of word processing is to make the text display black and white gap increase, and the details are sharper.
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Abstract
一种像素渲染方法及像素渲染装置，该像素渲染方法包括：获取原始图像各像素的RGB亮度值（S101），将其转化为RGBW亮度值（S102）；判断显示模式是否为文字显示模式（S103）；若是则按文字显示模式进行渲染（S104），否则按图片显示模式进行渲染（S105）；将渲染后的亮度值转化为灰阶值输出（S106）。该像素渲染方法及像素渲染装置能够保证实际分辨率不降低，不会带来显示细节的丢失。
Description
本发明涉及液晶显示领域，特别涉及一种像素渲染方法及像素渲染装置。
随着生活水平的不断提高和显示技术的不断发展，传统的三基色显示系统的缺点逐渐浮现，已经很难满足人们日益增长的需求。这主要体现在，随着显示屏分辨率的提高，像素的开口率会降低，屏幕的光穿透率也会下降，从而导致背光以及整个屏幕的功耗大幅增加。
RGBW显示屏相对传统RGB显示屏而言，除红色(R)子像素、绿色(G)子像素、蓝色(B)子像素外还包含白色(W)子像素，白色子像素的加入可以极大提高LCD（Liquid
Crystal Display，液晶显示器）的穿透率、OLED（Organic Light-Emitting
Diode，有机发光二极管）显示器单位面积的发光效率等，由此可实现低功耗，节能环保的目的。由于在同样的像素设计下，RGBW由于增加了一颗W子像素，因此会带来物理分辨率的下降。因此，在RGBW显示装置中，为了提高显示器的实际分辨率，需要采用子像素渲染的方法（sub-pixel
rendering，SPR）。
然而，基于传统的SPR方法的RGBW显示装置，在从输入的RGB信号到输出的RGBW信号的转化过程中，都会出现由于部分子像素信息的丢失，从而造成不同程度的显示细节信息的丢失。同时，对于文字和图片这两种完全不同的显示内容，传统的SPR方法并没有进行区别对待，而是采用相同的方式进行处理，这样就会造成文字显示亮度不够，细节不清晰，图片显示不够平滑等诸多问题。
本发明的目的在于提供一种像素渲染方法及像素渲染装置，以解决现有技术中，对像素进行渲染时，容易降低显示器的实际分辨率，部分子像素信息容易丢失，文字显示亮度不够，细节不清晰，以及图片显示不够平滑的问题。
本发明的技术方案如下：
一种像素渲染方法，其包括以下步骤：
获取原始图像各像素的RGB三基色分量的灰阶值，并将其转化为归一化后的亮度值；
将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；
判断待渲染像素的显示模式是否为文字显示模式；
若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染；
将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
优选地，将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值，按照如下公式进行计算：
W1=min（k*R0，k*G0，k*B0，Wmax）， R1=k*R0-W0，
G1=k*G0-W0， B1=k*B0-W0，
其中，k为增益系数，且k≥1，W1、R1、G1和B1分别为转化后的RGBW的亮度值，R0、G0和B0分别为转花前的RGB的亮度值，Wmax为W子像素的最大亮度值。
优选地，其中所述判断待渲染像素的显示模式是否为文字显示模式，具体包括：
获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；
比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；
判断所述亮度差值是否大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值；
若是则判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
优选地，其中所述按照图片显示模式进行渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=(W1+W2+W3)/3, R1out=(R1+R2+R3)/3,
G1out=(G1+G2+G3)/3, B1out=(B1+B2+B3)/3,
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中所述按照文字显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以所述第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=(P1+W2)/2, R1out=P2, G1out=P2,
B1out=P2；
当P1<P2时，则W1out=P1, R1out=（R1+R2）/2,
G1out=（G1+G2）/2, B1out=（B1+B2）/2；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中所述按照图片显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW的亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=a1*W1+a2*W2+a3*W3，
R1out=a1*R1+a2*R2+a3*R3，
G1out=a1*G1+a2*G2+a3*G3，
B1out=a1*B1+a2*B2+a3*B3，
其中，a1、a2与a3为加权系数，且0≤a1≤1，0≤a2≤1，0≤a3≤1，a1+a2+a3=1，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中所述a1=0.25，所述a2=0.5，所述a3=0.25。
优选地，其中所述按照文字显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2,
G1out=G2, B1out=B2；
当P1<P2时，则W1out=W1, R1out=min｛（R1+P2）/2,1｝,
G1out=min｛（G1+P2）/2,1｝,
B1out=min｛（B1+P2）/2,1｝；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
一种像素渲染装置，其包括：
灰阶值获取模块，用于获取原始图像各像素的RGB三基色分量的灰阶值；
第一转化模块，用于将所述RGB三基色分量的灰阶值转化为归一化后的亮度值；
第二转化模块，用于将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；
模式判断模块，用于判断待渲染像素的显示模式是否为文字显示模式；
文字渲染模块，用于当所述待渲染像素的显示模式为文字显示模式时，按照文字显示模式进行渲染；
图片渲染模块，用于当所述待渲染像素的显示模式为图片显示模式，按照图片显示模式进行渲染；
转化输出模块，用于将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
优选地，其中所述模式判断模块包括：
差值获取单元，用于获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；
数值比较单元，用于比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；
模式判断单元，用于当所述亮度差值大于所述预设亮度差阈值，且所述饱和度差值大于所述预设饱和度差阈值时，判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
一种像素渲染方法，其包括以下步骤：
获取原始图像各像素的RGB三基色分量的灰阶值，并将其转化为归一化后的亮度值；
将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；
判断待渲染像素的显示模式是否为文字显示模式；
若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染；
将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出；
其中，将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值，按照如下公式进行计算：
W1=min（k*R0，k*G0，k*B0，Wmax）， R1=k*R0-W0，
G1=k*G0-W0， B1=k*B0-W0，
其中，k为增益系数，且k≥1，W1、R1、G1和B1分别为转化后的RGBW的亮度值，R0、G0和B0分别为转花前的RGB的亮度值，Wmax为W子像素的最大亮度值；
其中，所述判断待渲染像素的显示模式是否为文字显示模式，具体包括：
获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；
比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；
判断所述亮度差值是否大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值；
若是则判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
优选地，其中所述按照图片显示模式进行渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=(W1+W2+W3)/3, R1out=(R1+R2+R3)/3,
G1out=(G1+G2+G3)/3, B1out=(B1+B2+B3)/3,
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中所述按照文字显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以所述第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=(P1+W2)/2, R1out=P2, G1out=P2,
B1out=P2；
当P1<P2时，则W1out=P1, R1out=（R1+R2）/2,
G1out=（G1+G2）/2, B1out=（B1+B2）/2；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中所述按照图片显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW的亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=a1*W1+a2*W2+a3*W3，
R1out=a1*R1+a2*R2+a3*R3，
G1out=a1*G1+a2*G2+a3*G3，
B1out=a1*B1+a2*B2+a3*B3，
其中，a1、a2与a3为加权系数，且0≤a1≤1，0≤a2≤1，0≤a3≤1，a1+a2+a3=1，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
优选地，其中优选所述a1=0.25，所述a2=0.5，所述a3=0.25。
优选地，其中所述按照文字显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2,
G1out=G2, B1out=B2；
当P1<P2时，则W1out=W1, R1out=min｛（R1+P2）/2,1｝,
G1out=min｛（G1+P2）/2,1｝,
B1out=min｛（B1+P2）/2,1｝；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
本发明的有益效果：
本发明公开了一种像素渲染方法及像素渲染装置，通过判断待渲染像素的显示模式是否为文字显示模式，若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染，具有以下的优点：
第一，本发明可以在显示面板物理分辨率下降的情况下，保证实际分辨率不降低。
第二，本发明所有的子像素信息都基本得到了保留，因此不会带来显示细节的丢失。
第三，本发明针对待渲染像素的显示模式进行了判断，并对文字和图片两种显示模式分别进行了不同的处理，图片处理的结果是使得图片显示效果更加平滑，尤其是在人像显示方面显示效果更好，文字处理的结果是使得文字显示黑白差距增大，细节更加锐化。
图1为本发明实施例的一种像素渲染方法的整体实施步骤流程图；
图2为本发明实施例的一种像素渲染方法的判断待渲染像素的显示模式是否为文字显示模式的实施步骤流程图；
图3为本发明实施例的一种像素渲染装置的整体结构示意图；
图4为本发明实施例的一种像素渲染装置的模式判断模块的整体结构示意图。
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
实施例一
请参考图1和图2，图1为本实施例的一种像素渲染方法的整体实施步骤流程图，图2为本实施例的一种一种像素渲染方法的判断待渲染像素的显示模式是否为文字显示模式的实施步骤流程图。从图1和图2可以看到，本发明的一种像素渲染方法，包括：
一种像素渲染方法，包括以下步骤：
步骤S101：获取原始图像各像素的RGB三基色分量的灰阶值，并将其转化为归一化后的亮度值。
在本步骤中，采用De-Gamma的转换方式将原始图像各像素的RGB三基色分量的灰阶值转化为归一化后的亮度值。具体采用如下公式进行计算：
y1=（x1/255）gamma；
其中，y1表示归一化后RGBW的亮度值，x1表示归一化前RGB的灰阶值。
步骤S102：将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值。
步骤S103：判断待渲染像素的显示模式是否为文字显示模式。
步骤S104：若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染。
步骤S105：若所述待渲染像素的显示模式为图片显示模式，则按照图片显示模式进行渲染。
步骤S106：将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
在本步骤中，采用Gamma的转换方法将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值，具体如下所示：
Y2=（x2/255）1/gamma；
其中，y2表示转化后RGBW的灰阶值，x2表示转化前RGBW的亮度值。
在本实施例中，将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值，按照如下公式进行计算：
W1=min（k*R0，k*G0，k*B0，Wmax）， R1=k*R0-W0，
G1=k*G0-W0， B1=k*B0-W0，
其中，k为增益系数，且k≥1，W1、R1、G1和B1分别为转化后的RGBW的亮度值，R0、G0和B0分别为转花前的RGB的亮度值，Wmax为W子像素的最大亮度值。
在本实施例中，如图2所示，所述判断待渲染像素的显示模式是否为文字显示模式，具体包括：
步骤S201：获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值。
步骤S202：比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小。
步骤S203：判断所述亮度差值是否大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值。
步骤S204：若所述亮度差值大于所述预设亮度差阈值，且所述饱和度差值大于所述预设饱和度差阈值，则判断所述待渲染像素的显示模式为文字显示模式。
步骤S205：若所述亮度差值大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值不成立，则判断所述待渲染像素的显示模式为图片显示模式。
在本实施例中，所述按照图片显示模式进行渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=(W1+W2+W3)/3, R1out=(R1+R2+R3)/3,
G1out=(G1+G2+G3)/3, B1out=(B1+B2+B3)/3,
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
在本实施例中，所述按照文字显示模式进行像素渲染，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以所述第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=(P1+W2)/2, R1out=P2, G1out=P2,
B1out=P2；
当P1<P2时，则W1out=P1, R1out=（R1+R2）/2,
G1out=（G1+G2）/2, B1out=（B1+B2）/2；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
扩大而言，在本实施例中，若是获取同一行像素中从左到右连续相邻排列的第一像素、第二像素、第三像素与第四像素的4个像素的RGBW亮度值，所述第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
P3=W3+(R3+G3+B3)/3，P4=W4+(R4+G4+B4)/3，
若左边虚拟像素的亮度大于右边虚拟像素的亮度，比如P1>P2时，则W1out=(P1+W2)/2, R1out=P2,
G1out=P2, B1out=P2；
若左边虚拟像素的亮度小于右边虚拟像素的亮度，比如P3<P4时，则W2out=P3,
R2out=（R3+R4）/2,
G2out=（G3+G4）/2, B2out=（B3+B4）/2；
其中，W1out、R1out、G1out和B1out分别为第一个所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W2out、R2out、G2out和B2out分别为第二个所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W3、R3、G3与B3分别为所述右像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W4、R4、G4与B4分别为所述右像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值。
本发明的一种像素渲染方法，通过判断待渲染像素的显示模式是否为文字显示模式，若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染，具有以下的优点：
第一，本发明可以在显示面板物理分辨率下降的情况下，保证实际分辨率不降低。
第二，本发明所有的子像素信息都基本得到了保留，因此不会带来显示细节的丢失。
第三，本发明针对待渲染像素的显示模式进行了判断，并对文字和图片两种显示模式分别进行了不同的处理，图片处理的结果是使得图片显示效果更加平滑，尤其是在人像显示方面显示效果更好，文字处理的结果是使得文字显示黑白差距增大，细节更加锐化。
实施例二
本实施例与实施例一的内容大部分相同，不同的部分如下所述：
本实施例的所述按照文字显示模式进行像素渲染，与实施例一的方法不同，其具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW的亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：
W1out=a1*W1+a2*W2+a3*W3，
R1out=a1*R1+a2*R2+a3*R3，
G1out=a1*G1+a2*G2+a3*G3，
B1out=a1*B1+a2*B2+a3*B3，
其中，a1、a2与a3为加权系数，且0≤a1≤1，0≤a2≤1，0≤a3≤1，a1+a2+a3=1，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
在本实施例中，优选所述加权系数a1=0.25，所述a2=0.5，所述a3=0.25。
在本实施例中，所述按照文字显示模式进行像素渲染，也与实施例一不同，具体包括：
获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
当P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2,
G1out=G2, B1out=B2；
当P1<P2时，则W1out=W1, R1out=min｛（R1+P2）/2,1｝,
G1out=min｛（G1+P2）/2,1｝,
B1out=min｛（B1+P2）/2,1｝；
其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
扩大而言，在本实施例中，若是获取同一行像素中从左到右连续相邻排列的第一像素、第二像素、第三像素与第四像素的4个像素的RGBW亮度值，所述第一像素为待渲染像素，按照如下公式进行计算：
P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，
P3=W3+(R3+G3+B3)/3，P4=W4+(R4+G4+B4)/3，
若左边虚拟像素的亮度大于右边虚拟像素的亮度，比如P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2,
G1out=G2, B1out=B2；
若左边虚拟像素的亮度小于右边虚拟像素的亮度，比如P3<P4时，则W2out=W3,
R2out=min｛（R3+P4）/2,1｝,
G2out=min｛（G3+P4）/2,1｝,
B2out=min｛（B3+P4）/2,1｝；
其中，W1out、R1out、G1out和B1out分别为第一个所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W2out、R2out、G2out和B2out分别为第二个所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值，W4、R4、G4与B4分别为所述第四像素的W子像素、R色子像素、G色子像素与B色子像素的亮度值。
本发明的一种像素渲染方法，通过判断待渲染像素的显示模式是否为文字显示模式，若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染，具有以下的优点：
第一，本发明可以在显示面板物理分辨率下降的情况下，保证实际分辨率不降低。
第二，本发明所有的子像素信息都基本得到了保留，因此不会带来显示细节的丢失。
第三，本发明针对待渲染像素的显示模式进行了判断，并对文字和图片两种显示模式分别进行了不同的处理，图片处理的结果是使得图片显示效果更加平滑，尤其是在人像显示方面显示效果更好，文字处理的结果是使得文字显示黑白差距增大，细节更加锐化。
实施例三
请参考图3和图4，图3为本实施例的一种像素渲染装置10的整体结构示意图，图4为本实施例的一种像素渲染装置10的模式判断模块104的整体结构示意图。从图3和图4可以看到，本发明的一种像素渲染装置10，包括：
灰阶值获取模块101，用于获取原始图像各像素的RGB三基色分量的灰阶值。
第一转化模块102，用于将所述RGB三基色分量的灰阶值转化为归一化后的亮度值。
第二转化模块103，用于将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值。
模式判断模块104，用于判断待渲染像素的显示模式是否为文字显示模式。
文字渲染模块105，用于当所述待渲染像素的显示模式为文字显示模式时，按照文字显示模式进行渲染。
图片渲染模块106，用于当所述待渲染像素的显示模式为图片显示模式，按照图片显示模式进行渲染。
转化输出模块107，用于将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
在本实施例中，所述模式判断模块104包括：
差值获取单元114，用于获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值。
数值比较单元124，用于比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小。
模式判断单元134，用于当所述亮度差值大于所述预设亮度差阈值，且所述饱和度差值大于所述预设饱和度差阈值时，判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
本发明的一种像素渲染装置10，通过判断待渲染像素的显示模式是否为文字显示模式，若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染，具有以下的优点：
第一，本发明可以在显示面板物理分辨率下降的情况下，保证实际分辨率不降低。
第二，本发明所有的子像素信息都基本得到了保留，因此不会带来显示细节的丢失。
第三，本发明针对待渲染像素的显示模式进行了判断，并对文字和图片两种显示模式分别进行了不同的处理，图片处理的结果是使得图片显示效果更加平滑，尤其是在人像显示方面显示效果更好，文字处理的结果是使得文字显示黑白差距增大，细节更加锐化。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
Claims (16)
- 一种像素渲染方法，其包括以下步骤：获取原始图像各像素的RGB三基色分量的灰阶值，并将其转化为归一化后的亮度值；将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；判断待渲染像素的显示模式是否为文字显示模式；若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染；将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
- 根据权利要求1所述的像素渲染方法，其中将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值，按照如下公式进行计算：W1=min（k*R0，k*G0，k*B0，Wmax）， R1=k*R0-W0，G1=k*G0-W0， B1=k*B0-W0，其中，k为增益系数，且k≥1，W1、R1、G1和B1分别为转化后的RGBW的亮度值，R0、G0和B0分别为转花前的RGB的亮度值，Wmax为W子像素的最大亮度值。
- 根据权利要求1所述的像素渲染方法，其中所述判断待渲染像素的显示模式是否为文字显示模式，具体包括：获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；判断所述亮度差值是否大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值；若是则判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
- 根据权利要求1所述的像素渲染方法，其中所述按照图片显示模式进行渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：W1out=(W1+W2+W3)/3, R1out=(R1+R2+R3)/3,G1out=(G1+G2+G3)/3, B1out=(B1+B2+B3)/3,其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求1所述的像素渲染方法，其中所述按照文字显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以所述第一像素为待渲染像素，按照如下公式进行计算：P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，当P1>P2时，则W1out=(P1+W2)/2, R1out=P2, G1out=P2, B1out=P2；当P1<P2时，则W1out=P1, R1out=（R1+R2）/2,G1out=（G1+G2）/2, B1out=（B1+B2）/2；其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求1所述的像素渲染方法，其中所述按照图片显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW的亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：W1out=a1*W1+a2*W2+a3*W3， R1out=a1*R1+a2*R2+a3*R3，G1out=a1*G1+a2*G2+a3*G3， B1out=a1*B1+a2*B2+a3*B3，其中，a1、a2与a3为加权系数，且0≤a1≤1，0≤a2≤1，0≤a3≤1，a1+a2+a3=1，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求6所述的像素渲染方法，其中优选所述a1=0.25，所述a2=0.5，所述a3=0.25。
- 根据权利要求1所述的像素渲染方法，其中所述按照文字显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以第一像素为待渲染像素，按照如下公式进行计算：P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，当P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2, G1out=G2, B1out=B2；当P1<P2时，则W1out=W1, R1out=min｛（R1+P2）/2,1｝,G1out=min｛（G1+P2）/2,1｝, B1out=min｛（B1+P2）/2,1｝；其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 一种像素渲染装置，其包括：灰阶获取模块，用于获取原始图像各像素的RGB三基色分量的灰阶值；第一转化模块，用于将所述RGB三基色分量的灰阶值转化为归一化后的亮度值；第二转化模块，用于将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；模式判断模块，用于判断待渲染像素的显示模式是否为文字显示模式；文字渲染模块，用于当所述待渲染像素的显示模式为文字显示模式时，按照文字显示模式进行渲染；图片渲染模块，用于当所述待渲染像素的显示模式为图片显示模式，按照图片显示模式进行渲染；转化输出模块，用于将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出。
- 根据权利要求9所述的像素渲染装置，其中所述模式判断模块包括：差值获取单元，用于获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；数值比较单元，用于比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；模式判断单元，用于当所述亮度差值大于所述预设亮度差阈值，且所述饱和度差值大于所述预设饱和度差阈值时，判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
- 一种像素渲染方法，其包括以下步骤：获取原始图像各像素的RGB三基色分量的灰阶值，并将其转化为归一化后的亮度值；将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值；判断待渲染像素的显示模式是否为文字显示模式；若所述待渲染像素的显示模式为文字显示模式，则按照文字显示模式进行渲染，否则按照图片显示模式进行渲染；将经过渲染后的所述待渲染像素的亮度值转化为其对应的灰阶值进行输出；其中，将归一化后的所述RGB三基色分量的亮度值转化为其对应的RGBW的亮度值，按照如下公式进行计算：W1=min（k*R0，k*G0，k*B0，Wmax）， R1=k*R0-W0，G1=k*G0-W0， B1=k*B0-W0，其中，k为增益系数，且k≥1，W1、R1、G1和B1分别为转化后的RGBW的亮度值，R0、G0和B0分别为转花前的RGB的亮度值，Wmax为W子像素的最大亮度值；其中，所述判断待渲染像素的显示模式是否为文字显示模式，具体包括：获取所述待渲染像素的左右两个相邻的像素之间的亮度差值与饱和度差值；比较所述亮度差值与预设亮度差阈值的大小，并比较所述饱和度差值与预设饱和度差阈值的大小；判断所述亮度差值是否大于所述预设亮度差阈值，且所述饱和度差值是否大于所述预设饱和度差阈值；若是则判断所述待渲染像素的显示模式为文字显示模式，否则判断所述待渲染像素的显示模式为图片显示模式。
- 根据权利要求11所述的像素渲染方法，其中所述按照图片显示模式进行渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：W1out=(W1+W2+W3)/3, R1out=(R1+R2+R3)/3,G1out=(G1+G2+G3)/3, B1out=(B1+B2+B3)/3,其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求11所述的像素渲染方法，其中所述按照文字显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以所述第一像素为待渲染像素，按照如下公式进行计算：P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，当P1>P2时，则W1out=(P1+W2)/2, R1out=P2, G1out=P2, B1out=P2；当P1<P2时，则W1out=P1, R1out=（R1+R2）/2,G1out=（G1+G2）/2, B1out=（B1+B2）/2；其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求11所述的像素渲染方法，其中所述按照图片显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素、第二像素与第三像素的RGBW的亮度值，以所述第一像素为所述待渲染像素，按照如下的公式进行计算：W1out=a1*W1+a2*W2+a3*W3， R1out=a1*R1+a2*R2+a3*R3，G1out=a1*G1+a2*G2+a3*G3， B1out=a1*B1+a2*B2+a3*B3，其中，a1、a2与a3为加权系数，且0≤a1≤1，0≤a2≤1，0≤a3≤1，a1+a2+a3=1，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述第一像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值，W3、R3、G3与B3分别为所述第三像素的W子像素、R子像素、G子像素与B子像素的亮度值。
- 根据权利要求14所述的像素渲染方法，其中优选所述a1=0.25，所述a2=0.5，所述a3=0.25。
- 根据权利要求11所述的像素渲染方法，其中所述按照文字显示模式进行像素渲染，具体包括：获取同一行像素中从左到右连续相邻排列的第一像素与第二像素的RGBW的亮度值，以第一像素为待渲染像素，按照如下公式进行计算：P1=W1+(R1+G1+B1)/3，P2=W2+(R2+G2+B2)/3，当P1>P2时，则W1out=min｛(P1+W2)/2，1｝, R1out=R2, G1out=G2, B1out=B2；当P1<P2时，则W1out=W1, R1out=min｛（R1+P2）/2,1｝,G1out=min｛（G1+P2）/2,1｝, B1out=min｛（B1+P2）/2,1｝；其中，W1out、R1out、G1out和B1out分别为所述待渲染像素经过渲染后的W子像素、R子像素、G子像素和B子像素的亮度值，W1、R1、G1与B1分别为所述待渲染像素的W子像素、R子像素、G子像素与B子像素的亮度值，W2、R2、G2与B2分别为所述第二像素的W子像素、R子像素、G子像素与B子像素的亮度值。
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