Video format conversion method of converting YUV444 to YUV420 based on chrominance component amplitude

A technology of YUV444 and chroma components, which is applied in the conversion field of YUV444 video format to YUV420 video format, which can solve the problem of loss of chroma information and achieve the effect of maintaining visual effects

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

[0006] In order to overcome the problem that the existing YUV444-to-YUV420 video format conversion method has more loss of chroma information, the present invention provides a method for converting the YUV444 format to the YUV420 format, which can keep the converted YUV420 format video with good chroma Visual effects

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  • Video format conversion method of converting YUV444 to YUV420 based on chrominance component amplitude
  • Video format conversion method of converting YUV444 to YUV420 based on chrominance component amplitude
  • Video format conversion method of converting YUV444 to YUV420 based on chrominance component amplitude

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0029] The Y component described below is the luminance 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.

[0030] Such as figure 1 Shown, a kind of video format conversion method that turns YUV420 based on the YUV444 of chrominance component magnitude, comprises the following steps:

[0031] (1) Input a frame of YUV444 video format data to be converted.

[0032] (2) Take out an unconverted 2x2 chroma component data block. C 1 、C 2 、C 3 and C 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, C 1 is the chroma component data in the upper left corner of the 2x2 chroma component data block, C 2 is the chroma component data in the upp...

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Abstract

The invention discloses a video format conversion method of converting YUV444 to YUV420 based on a chrominance component amplitude, and the method comprises the following steps of: (1) inputting a frame of YUV444 video format data to be converted; (2) taking out a 2*2 chrominance component data block which is not converted; (3) calculating an absolute value after respectively substracting 128 from the 4 taken chrominance component data taken out in the step (2) to obtain corresponding chrominance component amplitudes, and sequencing the 4 chrominance component data from largest to smallest according to the chrominance component amplitudes; (4) calculating a normalized weight value, and carrying out weighting average to obtain chrominance component data; (5) repeating the steps from (2) to (4) until conversion of all the 2*2 chrominance component data blocks in the current frame is finished; and (6) combining all luminance component data and the chrominance component data after conversion to form YUV420 format video data. By utilizing the video format conversion method, a YUV420 format video can have a good chrominance visual effect.

Description

technical field [0001] The invention relates to the field of digital video information processing, in particular to a method for converting a YUV444 video format into a YUV420 video format. Background technique [0002] The human visual system (HVS) is more sensitive to luminance than chrominance, so the resolution of chrominance information can be moderately reduced under the condition of maintaining the resolution of luminance information, so as to reduce the data volume of video data while maintaining the human eye's perception of video. The visual experience of the picture. [0003] In the YUV444 video format, the three components of Y, U, and V have the same horizontal and vertical resolution, and each pixel position has Y, U, and V components, that is, every 4 brightness components have corresponding 4 U Chroma component and 4 V chroma components. In the YUV420 video format, both the U component and the V component are half of the Y component in terms of horizontal a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N11/20H04N11/04
Inventor 朱威王则浪陈朋郑雅羽汪磊俞立
Owner ZHEJIANG UNIV OF TECH
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