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Method for converting YCbCr444 and YCbCr422

A conversion method and mode technology, applied in the field of color space, can solve problems such as image boundary blur

Active Publication Date: 2019-12-31
GUANGDONG VTRON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a conversion method between YCbCr444 and YCbCr422, which solves the problem that in the prior art, the method of converting YCbCr4:4:4 format into YCbCr4:2:2 and taking the average of two points will lead to blurred image boundaries

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  • Method for converting YCbCr444 and YCbCr422

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Embodiment Construction

[0025] The embodiment of the present invention provides a YCbCr444 and YCbCr422 conversion method. Compared with the traditional simple multi-point average calculation method, the average value is calculated according to the correlation of image data, and the deviation between the converted data and the original data is smaller, and the image quality can be effectively improved.

[0026] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly under...

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Abstract

The invention provides a YCbCr444 and YCbCr422 mutual conversion method, which comprises the following steps of: segmenting an image into sub-blocks with 2*2 pixel points, dividing four pixel points in each sub-block into two groups to obtain seven grouping modes, and calculating a Y component coded value of each group of pixel points in each grouping mode; calculating a deviation value between aY component coded value in each grouping mode and a Y component of a corresponding pixel point, and selecting the grouping mode with the minimum deviation value as a coding / decoding mode of a sub-block; performing Cb encoding and Cr encoding on the YCbCr444 data according to the encoding mode to obtain YCbCr422 data; and performing Cb decoding and Cr decoding on the YCbCr422 data according to thedecoding mode to obtain YCbCr444 data. Compared with a traditional conversion method, the YCbCr444 and YCbCr422 conversion method provided by the invention has the advantages that the deviation between converted data and original data is smaller, and the image quality can be effectively improved.

Description

technical field [0001] The invention relates to the field of color space, in particular to a conversion method between YCbCr444 and YCbCr422. Background technique [0002] The RGB model is a commonly used way of expressing color information at present. It uses the brightness of the three primary colors of red, green, and blue to quantitatively represent the color. Each pixel in the image is composed of three components of RGB. The YCbCr color space is an internationally standardized variant of YUV, which is used in digital television and image compression, where Y refers to the luminance component, Cb refers to the blue chroma component, and Cr refers to the red chroma component. The human eye is more sensitive to the Y component of the video, so after reducing the chroma component by subsampling the chroma component, the naked eye will not notice a change in image quality. The main sub-sampling formats are YCbCr 4:2:0, YCbCr 4:2:2 and YCbCr 4:4:4, where 4:2:0 means that ev...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/186H04N1/60H04N9/64
CPCH04N1/6008H04N9/64H04N19/186
Inventor 章波
Owner GUANGDONG VTRON TECH CO LTD
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