Compression and decompression methods on two-dimensional image d

Details Compression and decompression methods on two-dimensional image d Compression and decompression methods on two-dimensional image d

1995-09-11

1999-03-16

Couso, Jose L.

Image analysis

Image compression or coding

G06K 936

Patent

active

058839755

ABSTRACT:
A data compression apparatus includes a dictionary buffer for holding data of the immediately preceding line of successively inputted two-dimensional image data, a buffer for extracting a plurality of continuous data strings from the inputted data of the current line to store them as a partial data string to be compressed, a scanning comparison section for detecting whether or not the same data string as the partial data string to be compressed exists in the data stored in the dictionary buffer, and a code generator by which in the case where the presence of the same data string is detected by the scanning comparison section, data of the position and the length of a partial data string on the data of the immediately preceding line stored in the dictionary buffer is outputted as data of that partial data string of the current line.

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Ziv, Jacob and Lempel, Abraham, "Compression of Individual Sequences via Variable-Rate Coding," IEEE Transactions of Information Theory, vol. IT-24, No. 5, Sep. 1978, pp. 530-536.

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