Invention Grant
US09596487B2 Image coding method, image decoding method, image coding apparatus, image decoding apparatus, and image coding and decoding apparatus
有权
图像编码方法，图像解码方法，图像编码装置，图像解码装置以及图像编码和解码装置
- Patent Title: Image coding method, image decoding method, image coding apparatus, image decoding apparatus, and image coding and decoding apparatus
- Patent Title (中): 图像编码方法，图像解码方法，图像编码装置，图像解码装置以及图像编码和解码装置
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Application No.: US14927961Application Date: 2015-10-30
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Publication No.: US09596487B2Publication Date: 2017-03-14
- Inventor: Kengo Terada , Takahiro Nishi , Youji Shibahara , Kyoko Tanikawa , Hisao Sasai , Toshiyasu Sugio , Toru Matsunobu
- Applicant: Panasonic Intellectual Property Corporation of America
- Applicant Address: US NY New York
- Assignee: SUN PATENT TRUST
- Current Assignee: SUN PATENT TRUST
- Current Assignee Address: US NY New York
- Agency: Wenderoth, Lind & Ponack, L.LP.
- Main IPC: H04N7/18
- IPC: H04N7/18 ; H04N19/91 ; H04N19/463 ; H03M7/40 ; H04N19/60 ; H04N19/176 ; H04N19/18
Abstract:
An image coding method using arithmetic coding. The method includes: performing arithmetic coding on a first flag that indicates whether or not an absolute value of a target coefficient in a target coefficient block is greater than 1; and performing arithmetic coding on a second flag that indicates whether or not the absolute value is greater than 2. In the arithmetic coding on the first flag and the arithmetic coding on the second flag, it is determined whether or not an immediately-prior coefficient block that has been coded immediately prior to the target coefficient block includes a coefficient having an absolute value greater than a threshold value. Based on a result of the determination, respective contexts to be used in the arithmetic coding on the first and second flags are selected.
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