Apparatus for decompressing image data which has been compressed

Details Apparatus for decompressing image data which has been compressed Apparatus for decompressing image data which has been compressed

1997-01-16

1998-11-17

Tran, Phuoc

Image analysis

Image compression or coding

Including details of decompression

382277, 382250, G06K 936, G06K 946

Patent

active

058388257

ABSTRACT:
One block of non-zero coefficients obtained through the decoding of the entropy decoding unit 2024 is stored in the coefficient storage unit 121 in accordance with positional coordinates calculated by the non-zero coefficient scanning order calculation unit 2023a and the non-zero coefficient position conversion unit 2023b. The stored non-zero coefficients are then inverse quantized by the inverse quantization unit 2022. The non-zero coefficient range calculation unit 122 specifies a region of the coefficient storage unit 121 in which the non-zero coefficients are stored. The calculation order control unit 123 controls the inverse DCT unit 2021 to only perform an inverse DCT (discrete cosine transform) for non-zero coefficients located in the specified region.

REFERENCES:
patent: 4933892 (1990-06-01), Nakaya et al.
patent: 5387982 (1995-02-01), Kitaura et al.

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