Compression coding method for signal source with low code rate

Abstract

The invention discloses a compression coding method for a signal source with a low code rate and is suitable for broadcasting a static image sequence by turns. The method comprises the following steps of: performing DCT (discrete cosine transform) on the full-screen pixels of an original video image of each frame; weighting coefficients in the pixels and quantizing again; transmitting the coefficients according to the descending order of the possibility of the magnitude; performing entropy coding, operating length coding and transmitting the number of repeated data in the coefficients, converting the frequently appearing values into short-code words and converting other values into long-code words by using the variable length coding; forming the coefficient block data, encapsulating and splicing the coefficient block data into a macro block packet; performing time domain predictive coding and performing the most simplified processing on the predictive coding between two intra-frame coding images; encapsulating the macro block packet into a pixel strip packet; encapsulating a single-frame image packet; and generating an image picture group sequence. The technical scheme of the method effectively reduces generation of redundant data on the premise of relatively maintaining the objective image equality.

Description

technical field [0001] The invention relates to the technical field of digital television image compression coding, in particular to a low code rate information source compression coding method. Background technique [0002] At present, the relevant fields of digital TV both at home and abroad are in a period of rapid development. Various source coding technologies have developed to a stage where the number of users is huge and the relevant basic (algorithm) technologies are relatively mature, but the technical standards for specific applicable environments are not perfect (for example, there are many studio / video material formats dominated by manufacturers. Specific standards, but specific video format constraints applicable to set-top box terminals are seldom mentioned), especially for the rotation of static image sequences, there is no specific format constraints (because the main technical way to realize the slide show service on the set-top box at present is through Th...

AI Technical Summary

Problems solved by technology

[0008] (2) Cannot be supported by hardware decoding chips of most set-top boxes

[0009] (3) Does not support 3D stereo program format

[0024] (2) The 4:2:2 sampling format used in program production cannot be supported by the hardware decoding chip of the set-top box

Because the 4:2:2 sampling format has always been positioned in the field of professional video production / non-linear editing, currently no digital video signal broadcast by any broadcasting organization in the world adopts the 4:2:2 sampling format, so in civilian use In the field of consumer electronics products, 4:2:2 is hardly supported by set-top box hard decoding chip providers

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