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. 02, 2016
Filed:
Feb. 18, 2015
Megachips Corporation, Osaka-shi, JP;
Naotsugu Yamamura, Osaka, JP;
Akira Okamoto, Osaka, JP;
Makoto Saito, Osaka, JP;
Takuya Hiraoka, Osaka, JP;
MegaChips Corporation, Osaka-shi, JP;
Abstract
In an image coding apparatus (), a Hadamard transform unit () performs horizontal Hadamard transform on a picture of uncompressed image data (). The sum total of absolute values of AC component values obtained by the Hadamard transform is calculated as a Hadamard value () of the picture. A scene change determination unit () determines whether a scene change occurs or not in the picture on the basis of the Hadamard value (). In a case where a scene change occurs in the picture or where a differential absolute value between the amount of generated codes in a coded GOP and the ideal amount of codes in a GOP is larger than a predetermined reference value, a quantization parameter determination unit () determines a quantization parameter () of the picture on the basis of the Hadamard value () and the target amount of codes of the picture. A coding unit () codes the picture by using the determined quantization parameter ().