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. 31, 1996
Filed:
Nov. 14, 1994
Yuichi Kojima, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A technique for processing a decoded image signal having a distortion obtained by decoding coded data by utilizing a two-dimensional inverse orthogonal transformation in which the coded data is obtained by coding an image signal by utilizing a two-dimensional orthogonal transformation. At least one correction block is constructed each including a plurality of pixels from a plurality of coded blocks from the decoded image signal and having a distortion on at least one boundary therebetween. The coded blocks of each correction block are adjacent to one another. A two-dimensional orthogonal transformation of each the correction block is performed by utilizing a Haar function so as to form a plurality of coefficients including higher-order side coefficients, lower-order side coefficients and a dc coefficient. A correction value is added to the higher-order side coefficients in accordance with a predetermined number of the lower-order side coefficients when the predetermined number of the lower-order side coefficients have values other than zero so as to form a correction coefficient signal for each correction block. A two-dimensional inverse orthogonal transformation is performed on the correction coefficient signal of each correction block by utilizing the Haar function so as to obtain a smoothed image signal in which each distortion on each boundary of the coded blocks has been smoothed.