High speed, high precision image compression

Details High speed, high precision image compression High speed, high precision image compression

1997-09-17

2000-01-11

Boudreau, Leo H.

Image analysis

Image compression or coding

Transform coding

382232, 382239, 382248, G06K 936, G06K 946

Patent

active

06014467&

ABSTRACT:
An image compression system having: an image data supply unit for supplying image data divided into a block unit; a DCT unit for discrete-cosine-transforming the image data in the block unit supplied from the image data supply unit to generate DCT coefficients in the block unit; a coded data generating unit for successively generating coded data of the DCT coefficients at first and second compression factors each time the DCT coefficients of one block are generated by the DCT unit; a counter unit for accumulating the amount of coded data generated at each of the first and second compression factors by the coded data generating unit; and a compression factor estimating unit for estimating a compression factor suitable for generating coded data of a target amount, in accordance with the amounts of coded data accumulated at the first and second compression factors by the counter unit.

REFERENCES:
patent: 5361220 (1994-11-01), Asano
patent: 5764806 (1998-06-01), Horiuchi et al.

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