Invention Grant
- Patent Title: Video decoding apparatus, video decoding method, video encoding apparatus, and video encoding method
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Application No.: US15593569Application Date: 2017-05-12
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Publication No.: US09992509B2Publication Date: 2018-06-05
- Inventor: Tomoyuki Yamamoto , Tomohiro Ikai
- Applicant: SHARP KABUSHIKI KAISHA
- Applicant Address: JP Osaka
- Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee: SHARP KABUSHIKI KAISHA
- Current Assignee Address: JP Osaka
- Agency: Birch, Stewart, Kolasch & Birch, LLP
- Priority: JP2009-093606 20090408; JP2009-146509 20090619
- Main IPC: H04N7/50
- IPC: H04N7/50 ; H04N19/513 ; H04N19/91 ; H04N19/122 ; H04N19/134 ; H04N19/176 ; H04N19/182

Abstract:
While maintaining a high degree of freedom in choosing partition sizes and transformation sizes adapted for local characteristics of videos, the amount of metadata is decreased. A video encoding apparatus (10) divides an input video into blocks of a prescribed size and encodes the video block by block. The video encoding apparatus is provided with: a prediction parameter determining portion (102) that decides the block partition structure; a predictive image producing portion (103) that generates predictive images, partition by partition, as prescribed by the partition structure; a transform coefficient producing portion (107) which applies one of the frequency transformations included in a prescribed transformation preset to prediction residuals, i.e. the differences between predictive images and the input video; a transform restriction deriving portion (104) which generates the list of transform candidate, i.e. lists of frequency transformations that can be applied to each partition, on the basis of partition format information; and a variable-length-encoding portion (108) which, on the basis of the list of transform candidate and the transformation preset, performs variable-length encoding on transformation selection flags.
Public/Granted literature
- US20170251221A1 VIDEO DECODING APPARATUS, VIDEO DECODING METHOD, VIDEO ENCODING APPARATUS, AND VIDEO ENCODING METHOD Public/Granted day:2017-08-31
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