Invention Grant
- Patent Title: Refined entropy coding for level maps
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Application No.: US15798495Application Date: 2017-10-31
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Publication No.: US10484695B2Publication Date: 2019-11-19
- Inventor: Joseph Young , Dake He
- Applicant: GOOGLE LLC
- Applicant Address: US CA Mountain View
- Assignee: GOOGLE LLC
- Current Assignee: GOOGLE LLC
- Current Assignee Address: US CA Mountain View
- Agency: Young Basile Hanlon & Macfarlane, P.C.
- Main IPC: H04N19/159
- IPC: H04N19/159 ; H04N19/176 ; H04N11/02 ; H04N19/129 ; H04N19/18 ; H04N19/60 ; H04N19/13 ; H04N19/124 ; H04N19/44 ; H04N19/91 ; H04N19/122

Abstract:
Coding using level maps is disclosed. A method includes coding a scan position, in a forward scan direction, corresponding to an end-of-block and coding, in a backward scan direction, a non-zero map indicating positions of the transform block containing non-zero transform coefficients. The method also includes coding, in the backward scan direction, lower-range level maps, each lower-range level map having a respective map level up to a maximum map level, the lower-range level map indicating which absolute values of the non-zero transform coefficients are equal to the respective map level and which absolute values of the non-zero transform coefficients are greater than the respective map level. The method also includes coding a coefficient residual map, each residual coefficient of the coefficient residual map corresponding to a respective non-zero transform coefficient of the transform block having an absolute value exceeding the maximum map level.
Public/Granted literature
- US20190124342A1 REFINED ENTROPY CODING FOR LEVEL MAPS Public/Granted day:2019-04-25
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