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Image encoding and decoding system

A coding system and decoding system technology, applied in the field of second-order image joint compression image coding and decoding system, can solve problems such as difficult to achieve real-time, long processing time, etc.

Inactive Publication Date: 2009-05-20
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, its architecture takes a long time to process when judging TP (typical prediction) and combining upper and lower relational data to the calculation results of the adaptive arithmetic encoder, making it difficult to meet real-time requirements

Method used

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  • Image encoding and decoding system

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Embodiment Construction

[0015] 1 is a block diagram of an image encoding system of the present invention, wherein an image is composed of a plurality of lines, and the image encoding system mainly includes a line buffer 110, a first buffer 130, a comparator 135, a second buffer 150, an encoding Device 160 , encoder controller 170 , buffer 140 , first DACH 120 , second DACH 180 and third DACH 190 . The line buffer 110 is used for storing the Nth line data of the image. The first buffer 130 is coupled to the line buffer 110 and is used for storing partial data of the (N+1)th line of the image. The comparator is coupled to the line buffer and the first buffer to compare the partial data of the (N+1)th line stored in the first buffer and the Nth line data stored in the line buffer Alignments are made, from which typical predictions are generated.

[0016] The second buffer 150 is used for storing partial line segment data of the image. The encoding device 160 is coupled to the second buffer 150, and p...

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Abstract

The image is composed of a complex number of lines. The image system mainly includes line buffer, first buffer, comparator, second buffer, coding device, and coding controller. The line buffer is used to store material of number N line. The first buffer is used to store a part of material of number N+1 line. The comparator connects to line buffer and first buffer to compare a part of material of number N+1 line stored in first buffer with the material of number N line stored in line buffer; according to result of comparison, generates typical predication. The second buffer is used to store a part of line material of image. The coding device reads out the image material and typical prediction, and makes adaptive arithmetic coding.

Description

technical field [0001] The present invention relates to an image encoding and decoding system, in particular to a second-order image joint compression (Joint Bi-level Image Group, JBIG) image encoding and decoding system. Background technique [0002] The Joint Bi-level Image Group (JBIG) encoder and decoder mainly use adaptive arithmetic coding (adaptive arithmetic) method for compression and decompression. Compared with the Huffman (Huffman), modified Huffman (modified Huffman, MH), MR (modified Read), and MMR (modified modified READ) methods used in the G3 and G4 standards, the adaptive arithmetic coding method can It provides a better compression effect, but the computing time required for decoding with adaptive arithmetic coding is more than the time required by the previous algorithm. The JBIG codec utilizes prediction mechanisms like typical prediction (TP) to save computation time. The prediction mechanism of TP is to use the characteristics of adjacent pixels of e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H03M7/30H04N19/10H04N19/50
Inventor 张智凯何文政
Owner SUNPLUS TECH CO LTD