The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1999
Filed:
Dec. 19, 1996
Applicant:
Inventor:
Natsushi Ono, Fukuoka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K / ; G06K / ; H04N / ; H04N / ;
U.S. Cl.
CPC ...
382248 ; 382232 ; 382238 ; 348394 ; 348395 ; 348398 ;
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.