Invention Grant
- Patent Title: Context adaptive directional intra prediction
- Patent Title (中): 上下文自适应定向帧内预测
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Application No.: US13079929Application Date: 2011-04-05
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Publication No.: US08743957B2Publication Date: 2014-06-03
- Inventor: Wei Liu , Ehsan Maani , Mohammad Gharavi-Alkhansari
- Applicant: Wei Liu , Ehsan Maani , Mohammad Gharavi-Alkhansari
- Applicant Address: JP Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JP Tokyo
- Agent John P. O'Banion
- Main IPC: H04B1/66
- IPC: H04B1/66 ; H04N7/12 ; H04N11/02 ; H04N11/04 ; G06K9/46

Abstract:
Enhanced directional prediction apparatus and methods are taught which are based on edge-based adaptive directional estimation, for providing an improved prediction direction for intra prediction within a coding device. Image gradient vectors are obtained for pixels in the neighborhood of the current block, and edge directions determined. Candidate edge directions are processed to derive a dominant edge direction in response to defining an objective function as a summation of projections to a candidate direction and computing suggested direction of each neighboring pixel. The dominant edge direction may be utilized for the prediction direction, such as in response to a detection mode flag signaled to the decoder, or modified by an angular adjustment, which can be communicated to a decoder.
Public/Granted literature
- US20110249739A1 CONTEXT ADAPTIVE DIRECTIONAL INTRA PREDICTION Public/Granted day:2011-10-13
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