- Patent Title: Variable length coding method and variable length decoding method
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Application No.: US15703103Application Date: 2017-09-13
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Publication No.: US10349054B2Publication Date: 2019-07-09
- Inventor: Satoshi Kondo , Shinya Kadono , Makoto Hagai , Kiyofumi Abe
- Applicant: Godo Kaisha IP Bridge 1
- Applicant Address: JP Tokyo
- Assignee: GODO KAISHA IP BRIDGE 1
- Current Assignee: GODO KAISHA IP BRIDGE 1
- Current Assignee Address: JP Tokyo
- Agency: Wenderoth, Lind & Ponack, L.L.P.
- Priority: JP2002-126029 20020426; JP2002-363107 20021213
- Main IPC: H04N19/13
- IPC: H04N19/13 ; H04N19/129 ; H03M7/40 ; H04N19/176 ; H04N19/196 ; H04N19/61 ; H04N19/60 ; H04N19/136 ; H04N19/18 ; H04N19/167 ; H04N19/182

Abstract:
A variable length coding method is comprised of: a coefficient value scanning step in which an RL sequence generation unit, a reordering unit, and a binarization unit scan coefficient values within a block in a predetermined scanning order starting at a higher-frequency component toward a lower-frequency component; and an arithmetic coding step in which an arithmetic coding unit and a table storage unit perform arithmetic coding on the absolute values of the coefficient values according to the scanning order used in the coefficient value scanning step, by switching between probability tables for use, wherein, in the arithmetic coding step, a probability table to be used is switched to another probability table in one direction, when the arithmetic-coded absolute values of the coefficient values include an absolute value exceeding a predetermined threshold value.
Public/Granted literature
- US20180007357A1 VARIABLE LENGTH CODING METHOD AND VARIABLE LENGTH DECODING METHOD Public/Granted day:2018-01-04
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