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:
Aug. 31, 1993
Filed:
Nov. 27, 1991
Wataru Fujikawa, Yokohama, JP;
Akiyoshi Tanaka, Kawasaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An encoding noise reduction filter is described which is applicable to a decoded video signal produced from a digital video signal encoding and decoding apparatus of a type in which variable values of quantization step size are utilized within each video signal frame and in which orthogonal transform coefficients for respective picture element values are quantized and encoded. Low-amplitude high-frequency components of the decoded video signal are eliminated to achieve encoding noise reduction, with high-frequency emphasis processing of the resultant signal then being applied, and with the operations for eliminating low-amplitude high-frequency components and executing high-frequency emphasis being respectively controlled in accordance with the picture quality of the frame that is currently being processed, as expressed by an average value of quantization step size that was used in encoding processing of the frame.