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Channel parallel realizing method for down position plane coder under JPEG 2000 range associated mode

A technology of association mode and implementation method, which is applied in the direction of image communication, television, electrical components, etc., and can solve the problems of increased control complexity and insufficient processing speed

Inactive Publication Date: 2006-02-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after adopting multi-window design, the control complexity increases
And strictly speaking, the structure adopted by this scheme is quasi-parallel: there is no case where two contexts are output in the same clock cycle. When the arithmetic coding adopts a three-step pipeline design, the processing speed of this structure is still insufficient.

Method used

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  • Channel parallel realizing method for down position plane coder under JPEG 2000 range associated mode
  • Channel parallel realizing method for down position plane coder under JPEG 2000 range associated mode
  • Channel parallel realizing method for down position plane coder under JPEG 2000 range associated mode

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] 1) Code block input

[0040] Before bit-plane encoding, the code block data needs to be read in advance, and written into the quantization coefficient memory so that it can be accessed at any time during the encoding process. Its front stage is a code-block division (Code-block Division) device, which outputs the start pulse and sends out the quantization coefficients line by line. Each clock cycle of the bit-plane encoder can complete the receiving and writing of a coefficient, and at the same time judge the maximum value of the current coefficient. After all the quantization coefficients are written, the number m of effective bit planes of the code block can be calculated. Specific steps are as follows:

[0041] ①. Order p max = 0;

[0042] ②. Receive the quantization coefficient p sent by the previous stage, if |p|>p max , then p max =|p|, wr...

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Abstract

By using the method, the process speed is three times than serial method. The 4X5 sliding windows coder designed by the invention can generate three channels context data is paralle, by using method of inserting zero at edge, the serial coding without a break between band-to-band and between plane-to-plane is implemented. The coding efficiency of the invention is higher than the method using multi windows parallel raised by Jen-ShiunChiang.

Description

technical field [0001] The invention belongs to the technical field of VLSI design, and relates to a vertical causal mode in the still image compression standard JPEG2000, in particular to a channel parallel implementation method of a bit-plane encoder under the JPEG2000 vertical causal mode controlled by a single sliding window. Background technique [0002] JPEG2000 is a new generation of still image compression standard. Compared with JPEG, it supports a higher compression ratio and has more abundant compression functions. A major feature of JPEG2000 is the use of the EBCOT (Embedded Block Coding with Optimized Truncation) algorithm proposed by D.Taubman, that is, embedded block coding with ideal truncation. This algorithm is based on the arithmetic coding generated based on the context, and integrates the concept of channel scanning, which provides favorable conditions for JPEG2000 constant bit rate compression control. The final compressed file size is accurate and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41H04N7/26H04N19/156H04N19/21H04N19/70
Inventor 郑南宁朱悦心刘跃虎王勇梅魁志
Owner XI AN JIAOTONG UNIV