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:
Apr. 08, 2003
Filed:
Aug. 13, 2001
Dominic Yip, Lindfield, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of entropy coding symbols representative of a code block comprising transform coefficients of a digital image. The method comprises a significance propagation pass , a magnitude refinement pass , and a cleanup pass for entropy coding the symbols. The method generates ( ), prior to the significance propagation pass of the current bitplane, a first list of positions of those coefficients in the code block that have symbols to be entropy coded during the significance propagation pass of the current bitplane. The method also generates ( ), prior to the magnitude refinement pass of the current bitplane, a second list of positions of those said coefficients in the code block that have symbols to be entropy coded during the magnitude refinement pass of the current bitplane. The method further generates ( ), prior to the cleanup pass of the current bitplane, a third list of positions of those said coefficients in the code block that have symbols to be entropy coded during the cleanup pass of the current bitplane.