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Video frequency compression

A video compression and video data technology, applied in the field of video communication, can solve the problem of inability to accurately distinguish image content, etc., and achieve good image subjective effect and low computational complexity

Active Publication Date: 2008-01-30
TENCENT TECH (SHENZHEN) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, it is obviously impossible to accurately distinguish the image content

Method used

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  • Video frequency compression

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Embodiment Construction

[0048] The specific implementation manners of the present invention will be described below in conjunction with the accompanying drawings.

[0049] For video communication applications such as conference TV and videophone, video images can be divided into foreground and background, which helps to improve subjective visual quality, conforms to the human eye's attention concentration mechanism, and enables Guarantee the subjective quality of the image. The foreground area mainly refers to objects of interest (including skin color, etc.), moving objects, and objects close to the camera. The background area mainly refers to non-interesting targets, stationary objects, and objects far away from the camera. In applications such as video conferencing and video telephony, in general, attention to the foreground image (especially the face image) is higher than other content in the image, and the image and some actions of the participants, especially the speaker himself, are also Ther...

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Abstract

After making motion estimation, motion compensation, DCT transformation and quantization, and entropy coding for input video data at transmission end, the video data is sent to reception end and is mad a reversing process at reception end to recover the video data. The method also includes following steps: the image is divided into foreground image and background image that are identified as foreground macro block and background macro block; the quantify parameter (QP) of current foreground macro block and background macro block is made quantization step regulation.

Description

technical field [0001] The invention relates to the field of video communication, in particular to a video compression method in a video conference system and a videophone system. technical background [0002] The existing video image compression standards MPEG-1, MPEG-2, MPEG-4, H.261, H.263, and H.264 are all based on DCT transformation, among which H.264 and MPEG-4 AVC use performance Integer transform approaching to DCT, the basic processing unit is a 16X16 macroblock, and its general processing framework is shown in Figure 1. [0003] As can be seen from the figure, in the prior art, the following steps are included: [0004] The sending end inputs the video image and divides it into 16X16 macroblocks; [0005] The sending end performs motion estimation and motion compensation on the input video image data; [0006] Perform DCT transformation processing on the above data; [0007] Perform quantization processing on the transformed data; [0008] Entropy encoding is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N7/15H04N19/51H04N19/625
Inventor 熊联欢
Owner TENCENT TECH (SHENZHEN) CO LTD
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