Picture data decompression apparatus

Details Picture data decompression apparatus Picture data decompression apparatus

1995-07-28

1999-05-25

Shalwala, Bipin

Image analysis

Image compression or coding

Including details of decompression

382232, 382234, 382246, 382251, 348403, 348416, G06K 936, G06K 938, G06K 946, H04N 712

Patent

active

059076356

ABSTRACT:
The invention provides a picture data decompression apparatus which reduces the time required for decompression of picture data and operates at a high speed. The picture data decompression apparatus includes a module switching section for extracting code patterns in units of n bits the compressed picture data, m decoding and dequantization modules, and an inverse orthogonal transform section for inverse orthogonal transforming decoded and dequantized data from the m decoding and dequantization means. Each of the decoding and dequantization modules decodes and dequantizes, from a code pattern in units of n bits extracted by the module switching section, only a predetermined variable length code of a single unique code pattern of n bits from among m different predetermined patterns. Each of the decoding and dequantization modules performs storage into the dequantized data buffer in order of coded coefficients without performing scanning conversion, and the inverse orthogonal transform section reads out the stored data of the dequantized data buffer designating an address and performs inverse orthogonal transform processing of the thus read out data.

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