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Method and apparatus of motion compensation for video coding based on bi prediction optical flow techniques

A motion compensation, bidirectional light technology, applied in the field of video encoding and decoding, can solve the problem of high computational complexity

Inactive Publication Date: 2018-04-17
MEDIATEK INC
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Therefore, the computational complexity of bidirectional optical flow is much higher than that of traditional bidirectional prediction

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  • Method and apparatus of motion compensation for video coding based on bi prediction optical flow techniques
  • Method and apparatus of motion compensation for video coding based on bi prediction optical flow techniques
  • Method and apparatus of motion compensation for video coding based on bi prediction optical flow techniques

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[0039] The following description is a preferred mode of carrying out the present invention. The purpose of this description is to illustrate the general principles of the invention, not to limit it. The scope of protection of the present invention should be defined by the claims.

[0040] In VCEG-AZ05, bi-directional optical flow is implemented as an additional flow to the flow specified in the HEVC reference software. As shown in equation (1), according to conventional HEVC, a motion compensated prediction is generated. On the other hand, motion compensated prediction from bidirectional optical flow is shown in Equation (2), where additional parameters are determined to modify conventional motion compensated prediction. Bidirectional optical flow is always applied to these blocks with true bidirectional prediction. To avoid increasing memory bandwidth in the worst case. The method of the present invention only applies bi-directional optical flow to larger blocks. For exa...

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Abstract

A method and apparatus of motion compensation using the bi-directional optical flow (BIO) techniques are disclosed. According to one method, the use of BIO is extended to general bi-prediction motioncompensation by including the case that two reference pictures correspond to two previously coded pictures. According to another method, the use of BIO is adaptively applied depending on the linearityof the two motion vectors associated with the two reference blocks or depending on block size of the current block. According to yet another method, the refined motion vectors by compensating the original motion vectors with the respective x-offset values and y-offset values are stored in a motion-vector buffer for motion vector prediction of one or more following blocks.

Description

[0001] priority statement [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 213,249, filed September 2, 2015. The aforementioned US Provisional Patent Application is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to motion compensation for video encoding and decoding using bi-directional optical flow (BIO) technology. In particular, the invention relates to extending bi-directional optical flow to more general examples, or adaptively using bi-directional optical flow, to improve performance or reduce complexity. Background technique [0004] Bidirectional optical flow is JCTVC-C204 (E.Alshina, et al., Bi-directional optical flow, Joint Collaborative Team on Video Coding (JCT-VC) of ITU-T SG16WP 3and ISO / IECJTC 1 / SC 29 / WG 11, 3rd Meeting: Guangzhou, CN, 7-15October, 2010, Document: JCTVC-C204) and VCEG-AZ05 (E.Alshina, et al., Known tools performance investigation for next gener...

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Application Information

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IPC IPC(8): H04N19/51
CPCH04N19/54H04N19/577H04N19/53H04N19/521G06T7/269H04N19/176H04N19/182H04N19/51H04N19/513
Inventor 陈庆晔庄子德陈渏纹孙域晨黄毓文
Owner MEDIATEK INC