Image compressing method and image compressing apparatus

Details Image compressing method and image compressing apparatus Image compressing method and image compressing apparatus

1996-12-19

1999-03-16

Boudreau, Leo M.

Image analysis

Image compression or coding

Transform coding

382232, 382238, 348394, 348395, 348398, G06K 936, G06K 946, H04N 1102, H04N 1104

Patent

active

058839780

ABSTRACT:
In image compression utilizing wavelet conversion for dividing an image of one screen into subbands through multiple steps, subband data of a higher frequency is predicted from subband data of a lower frequency, subtraction is carried out between data obtained by the prediction and an actual higher-frequency subband coefficient at the same position as that for the predicted data to provide a difference, and only the difference is coded. By coding only the difference in this manner, a high compression ratio can be realized.

REFERENCES:
patent: 5598214 (1997-01-01), Kondo et al.

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