Title:
【発明の名称】画像信号処理方法
Document Type and Number:
Japanese Patent JP3365572
Kind Code:
B2
Abstract:
A technique is provided for processing a decoded image signal (S10) having distortion and obtained by decoding coded data by utilizing a two-dimensional inverse orthogonal transformation, the coded data having been obtained by coding an image signal by utilizing a two-dimensional orthogonal transformation. The technique constructs (10) at least one correction block 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 correction block is performed (11) by utilizing a Haar function so as to form coefficients including higher-order side coefficients (404), lower-order side coefficients (403) and a dc coefficient (402). 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 has values other than zero so as to form a correction coefficient signal for each correction block. A two-dimensional inverse orthogonal transformation (15) 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.
Inventors:
Yuichi Kojima
Application Number:
JP30873093A
Publication Date:
January 14, 2003
Filing Date:
November 15, 1993
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G06T9/00; H03M7/30; H04N1/41; H04N19/102; H04N19/132; H04N19/136; H04N19/176; H04N19/189; H04N19/196; H04N19/42; H04N19/423; H04N19/44; H04N19/60; H04N19/63; H04N19/86; (IPC1-7): H04N7/30; H04N1/41
Attorney, Agent or Firm:
Keiki Tanabe