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. 30, 2025
Filed:
Feb. 20, 2023
Sharp Kabushiki Kaisha, Sakai, JP;
Tomonori Hashimoto, Sakai, JP;
Tomohiro Ikai, Sakai, JP;
Yukinobu Yasugi, Sakai, JP;
Tomoko Aono, Sakai, JP;
SHARP KABUSHIKI KAISHA, Sakai, JP;
Abstract
Video coding and decoding apparatuses that can enhance coding efficiency are provided. A video decoding apparatus according to an aspect of the present invention includes a parameter decoder configured to decode a transform coefficient and a coefficient sign prediction error from coded data, and a sign prediction unit configured to predict a sign of the transform coefficient. The sign prediction unit derives a cost with reference to a boundary pixel with a neighboring block for a candidate of a combination of signs of transform coefficients without sign information, selects the sign, based on the cost, and modifies the predicted transform coefficient sign, using the coefficient sign prediction error decoded by the parameter decoder. The sign prediction unit divides the transform coefficients without the sign information into multiple groups, and performs the prediction on a transform coefficient of the transform coefficients for each of the multiple groups.