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:
Jul. 28, 1981
Filed:
May. 02, 1980
Frank W Mounts, Colts Neck, NJ (US);
Arun N Netravali, Matawan, NJ (US);
Bell Telephone Laboratories, Incorporated, Murray Hill, NJ (US);
Abstract
The efficiency with which a video signal is encoded is increased by examining successive blocks of M picture elements to determine which K pels have frame differences which do not exceed a predetermined threshold. The values of these K pels are intentionally altered, and the pels are applied to a transform circuit which generates N.ltoreq.M corresponding coefficient values. Only N-K of the coefficient values, and a code indicating the unchanged pel locations are then encoded for transmission. The decoder (and the feedback loop of the encoder) is arranged to recover the original picture using only the frame differences for pels which have changed significantly.