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:
Dec. 09, 1997
Filed:
Apr. 30, 1993
Applicant:
Inventor:
Ashok Kolar Rao, Germantown, MD (US);
Assignee:
Comsat Corporation, Bethesda, MD (US);
Primary Examiner:
Int. Cl.
CPC ...
G06K / ;
U.S. Cl.
CPC ...
382266 ; 382253 ; 382268 ;
Abstract
The quality of reconstructed images is improved by a post-processing method at the decoder which uses codeword-dependent, spatially-varying 2-dimensional filters. The post-filtering, working across block boundaries, reduces coding artifacts and increases the signal-to-noise ratio. The technique is applicable for use with any VQ-based image compression and can also be used in conjunction with image magnification.