Method for expanding data

Details Method for expanding data Method for expanding data

1998-06-12

2000-12-05

Tran, Phuoc

Image analysis

Image compression or coding

Including details of decompression

382250, G06K 936, G06K 946

Patent

active

061577421

ABSTRACT:
In a data expanding method, compressed data including a plurality of blocks is first subjected to entropy decoding, block by block, in a horizontal direction. At a last block on each line, the decoded data is subjected to inversive quantization. By decoding the last block on a line, an address is detected that is recorded with head data of a head block on a next line. By the inversive quantization of the last block of the line, a DC value is detected that is required for inversively quantize the head block of the next line. The block beginning from the detected address is subjected to entropy decoding and inversive quantization so that the inversively quantized data is subjected to IDCT conversion using the detected DC value. Also, during expansion, an adjacent block address and a DC value of the current block are detected.

REFERENCES:
patent: 4951157 (1990-08-01), Koh et al.
patent: 5099325 (1992-03-01), Artieri et al.
patent: 5327248 (1994-07-01), Miller et al.
patent: 5694489 (1997-12-01), Kishi
W.B. Pennebaker and J.L. Mithcell: "JPEG Still Image Data Compression Standard"1992, Van Nostrand Reinhold, US, New York XP002126854.

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