Invention Grant
- Patent Title: Transform coefficient coding using level maps
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Application No.: US15415974Application Date: 2017-01-26
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Publication No.: US10244261B2Publication Date: 2019-03-26
- Inventor: Yaowu Xu , Jingning Han , Ching-Han Chiang
- Applicant: GOOGLE INC.
- 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: H04N19/129
- IPC: H04N19/129 ; H04N19/60 ; H04N19/44 ; H04N19/18 ; H04N19/88 ; G06K9/00 ; G08B13/196 ; H04N5/232 ; H04N19/48 ; H04N19/645 ; H04N19/70 ; H04N19/13 ; H04N19/91 ; H04N19/157

Abstract:
A method for encoding a transform block in an encoded video bitstream is provided. The method includes encoding a non-zero map indicating positions of the transform block containing non-zero transform coefficients, encoding a respective lower-range level map, and encoding a coefficient residual map. A lower-range level map indicates which values of the non-zero transform coefficients are equal to and which are greater than the map level. Each residual coefficient of the coefficient residual map corresponds to a respective non-zero transform coefficient of the transform block having an absolute value exceeding the maximum map level. An apparatus including a processor and a memory for decoding a transform block is also provided. The memory includes instructions executable by the processor to decode, a non-zero map, decode lower-range level maps up to a maximum map level, and decode a coefficient residual map.
Public/Granted literature
- US20180213258A1 TRANSFORM COEFFICIENT CODING USING LEVEL MAPS Public/Granted day:2018-07-26
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