A multi-description coding method based on alternate function system

A multi-description encoding and iterative function technology, applied in the field of multi-description encoding and decoding based on iterative function system, and image multi-description encoding and decoding, to achieve the effect of strong channel transmission robustness, enhanced robustness, and good encoding and decoding performance

Inactive Publication Date: 2007-11-28
BEIJING JIAOTONG UNIV
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Problems solved by technology

No method described so far is based on fractal coding

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  • A multi-description coding method based on alternate function system
  • A multi-description coding method based on alternate function system
  • A multi-description coding method based on alternate function system

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0041] The important modules shown in Figure 2 are explained in detail as follows:

[0042] 1. Generate multiple descriptions

[0043] As shown in Figure 3, after fractal encoding, the image is divided into disjoint value range sub-blocks. For the segmented value range sub-blocks, the checkerboard distribution method is used to divide them into two groups, and each group is used as a road block. Description, the advantage of this allocation is that any fixed value range block in each group has another set of value range blocks around it, and the mapping of lost blocks can be better restored by using the correlation of fractal transformations between image blocks information. The mapping corresponding to these range blocks constitutes the code stream of each description, which is called the main description (P i i=1, 2). In Figure 3, the li...

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Abstract

This invention discloses a multi-description coding method based on an iterative function system, which applies a tessellated segment mode to divide an iterated function system to several parts taken as descriptions to be transmitted at the coding terminal, when receiving only one path of description information, it applies a fractal extrapolation method to resume the un-received information and re-structure an iterative function system and finally repeatedly iterates the received iterative function system to get decoded images.

Description

technical field [0001] The invention relates to an image multi-description encoding and decoding method, more specifically, relates to a multi-description encoding and decoding method based on an iterative function system, and belongs to the technical field of image encoding and decoding. Background technique [0002] Fractal image coding is a novel image compression method developed in the past ten years. Compared with other relatively mature compression technologies, it has many advantages such as high compression ratio and resolution independence. It uses the fixed point theory in mathematics and tries to use a function (family) to describe the whole image, which is called iterative function system. It is essentially different from the previous orthogonal transform coding; when decoding, it can converge to the decoded image regardless of the initial image by performing a limited number of iterative transformations on any resolution image. Barnsley and Sloan first propose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24H04N7/26H04N19/192H04N19/91
Inventor 赵耀张志远
Owner BEIJING JIAOTONG UNIV
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