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Format conversion method for computer desktop video from YUV444 to YUV420 based on chrominance information classification

A technology of YUV444 and computer desktop, which is applied in the field of format conversion from YUV444 to YUV420, and can solve problems such as single chroma component conversion processing and loss of chroma information

Active Publication Date: 2012-11-28
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to overcome the problem that the existing YUV444-to-YUV420 computer desktop video format direct extraction method and direct averaging method have a single chroma component conversion process, resulting in more loss of chroma information, the present invention provides a chroma information-based The format conversion method of classified computer desktop video YUV444 to YUV420 can make the converted desktop video of YUV420 format keep more chromaticity information, and provide YUV420 format input video with good chromaticity quality for the compression of computer desktop video, to improve Image quality of computer desktop video stream after compression

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  • Format conversion method for computer desktop video from YUV444 to YUV420 based on chrominance information classification
  • Format conversion method for computer desktop video from YUV444 to YUV420 based on chrominance information classification

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0043] The Y component described below is the brightness component in the YUV color space of the video signal, and the U and V components are two chrominance components in the YUV color space of the video signal.

[0044] Such as figure 1 As shown, a computer desktop video YUV444 to YUV420 format conversion method based on chroma information classification, comprising the following steps:

[0045] (1) Input a frame of YUV444 video format data to be converted.

[0046] (2) Take out an unconverted 2x2 chroma component data block. with P 1 ,P 2 ,P 3 and P 4 Indicates the 4 chroma component data of the current 2x2 chroma component data block arranged in order from top to bottom and from left to right, that is, P 1 is the chroma component data in the upper left corner of the 2x2 chroma component data block, P 2 is the chroma component data in t...

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Abstract

The invention provides a format conversion method for a computer desktop video from YUV444 to YUV420 based on chrominance information classification, comprising the following steps of: (1) inputting one frame of YUV444 video format data to be converted; (2) taking out an unconverted 2*2 chrominance component data block; (3) determining a belonging type of the 2*2 chrominance component data block and converting the 2*2 chrominance component data block into one chrominance component datum corresponding to a YUV420 format according to the belonging type; (4) taking out a next unconverted 2*2 chrominance component data block and repeating the steps (2)-(3) until all the 2*2 chrominance component data blocks of the current frame are converted; and (5) taking out all chrominance component data of the video data of the frame obtained from the step (1) to be combined with the converted chrominance component data to form YUV420 format video data. The computer desktop video with the YUV420 format has a good chrominance visual effect.

Description

technical field [0001] The invention relates to the field of video information processing, in particular to a format conversion method for computer desktop video from YUV444 to YUV420. Background technique [0002] YUV is a video format represented by luminance component (Y component) and chrominance component (U component and V component). According to the difference between the Y component, U component and V component, it can be divided into YUV444, YUV422, Different types of formats such as YUV420 (see Bi Houjie, Wang Jian. The new generation of video compression coding standard: H.264 / AVC. People's Posts and Telecommunications Press. 2009), among which the Y, U, and V components of the YUV444 video format have the same level And vertical resolution, each pixel position has 3 components, Y component, U component and V component, that is, each 2x2 luma component data block corresponds to 1 2x2 chroma U component data block and 1 2x2 chroma V Component data block. In the ...

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Application Information

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IPC IPC(8): H04N11/20H04N11/04
Inventor 朱威王则浪郑雅羽陈朋汪磊俞立
Owner ZHEJIANG UNIV OF TECH
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