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Quantization method for video data compression

A quantization method and video data technology, applied in digital video signal modification, television, electrical components, etc., can solve the problem of selecting quantization coefficients, achieve the effect of improving the compression effect and avoiding the block effect

Active Publication Date: 2008-08-27
TENCENT TECH (SHENZHEN) CO LTD
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Problems solved by technology

[0009] This quantization method can make the compressed data meet the predetermined code rate, but because the quantization method does not select the quantization coefficient according to the content of the image, some areas of the image have obvious block effects after encoding

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Embodiment Construction

[0035] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0036] The method of the invention adopts different quantization coefficients to encode the current area according to different characteristics of the image area. The specific method is: first calculate the mean square error value of each macroblock in the image, mark flat macroblocks according to the mean square difference value, and then mark transitional macroblocks according to the properties of the surrounding macroblocks of each macroblock, and then The quantized coefficients of the transitional macroblocks are reduced after the block has undergone coefficient transformation.

[0037] The method of the present invention will be described in detail below.

[0038] Before transforming the coefficients of the image, it is first determined wheth...

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Abstract

The invention discloses a quantization method for video data compression, which comprises: determining transition region between smooth and complex regions of current being treated image; after coefficient transformation to every image region, calculating respectively initial quantization coefficient of every region according to required code rate; in transition region, decreasing its quantization coefficient and quantizing it with new quantization coefficient; in non-transition region, using said initial coefficient for quantization. This invention can improve compression effect to image transition region to avoid obvious diamond effect after coding.

Description

technical field [0001] The invention relates to video data compression technology, in particular to a quantization method for video data compression. Background technique [0002] In multimedia applications, a 640×480 256-color image occupies 300kB of data, and dynamic video requires 25 to 30 frames of images per second, so 256-color video images are played in a 640×480 window, even if In the absence of sound data, it is also required to process about 8MB of data per second. It can be seen that a CD-ROM disk with a capacity of 650MB can only store about 80 seconds of dynamic video. In addition, the data transmission rate of the ISA bus of an ordinary PC can only reach 5MB / s at most, and it cannot transmit dynamic video data in real time. Therefore, in order to store and process multimedia data in real time, some technologies must be used to reduce the amount of multimedia data, among which, video data compression technology is more important. [0003] The relationship betw...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/124H04N19/146
Inventor 梁柱
Owner TENCENT TECH (SHENZHEN) CO LTD
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