System for second order image association compressed encoding and decoding

Abstract

The invention relates to a second-order image combined compression (JBIG) coding and decoding system, which provides a series of complete sequences of arithmetic coding and decoding, and an assemblage of parallel computation in order to reduce the complex nature of a JBIG arithmetic coder circuit and a JBIG arithmetic decoder circuit, and to cause the processing speed of a JBIG coder and a decoder to be faster. The rapid JBIG coding system of the invention receives the picture elements of an image data flow and the context which corresponds to the picture elements, and according to a prestored table and a prestored probability estimation table, the JBIG coding system makes an adaptable arithmetic coding on the picture elements, and makes a non-distortion compression on the image data flow. The rapid JBIG decoding system of the invention receives the data and the context of the compressed data flow, according to the prestored table and the prestored probability estimation table, the JBIG decoding system makes an adaptable arithmetic decoding on the compressed data, and obtains the image data flow.

Description

technical field [0001] The present invention relates to digital image encoding and decoding technology, in particular to a second-order image joint compression encoding and decoding system. Background technique [0002] The most well-known bi-level image compression specifications in the past were mostly the compression standards for G3 and G4 facsimile machines. Under the strong demand of office automation, fax machines have become the new darling of office affairs machines. However, due to the limitations of using fax machines at present, it also exposes its own problems: [0003] (1) Inconsistency of terminal resolution. At present, due to the limitation of the resolution of general computer terminals, the fax documents cannot be displayed in the entire tent. [0004] (2) There is no progressive function to browse image data immediately. That is to say, it is necessary to wait until the entire document image is output by the fax machine before the image content can be...

AI Technical Summary

Problems solved by technology

At present, due to the limitation of the resolution of the general computer terminal, the fax document cannot be displayed in the tent as a whole.

[0004] (2) There is no progressive function to browse image data immediately

[0005] (3) When inputting an image with grayscale values, the output image quality is extremely poor

However, the combination of sequential and parallel calculations disclosed in this patent is only a part of the entire arithmetic decoding process, so the time that can be shortened is also limited. In addition, this patent only focuses on the process of decompression. For compression process not described

Therefore it can be seen that there are still many shortcomings in the hardware structure of the aforementioned JBIG encoder and decoder and there is a need for improvement.

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