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Motion compensation method and device using bidirectional optical flow

專利號(hào)
US11800142B2
公開日期
2023-10-24
申請(qǐng)人
SK TELECOM CO., LTD.（KR Seoul）
發(fā)明人
Jeong-yeon Lim; Hyo Song Kim; Hyeong-duck Kim; Se-hoon Son; Jae-seob Shin; Gyeong-taek Lee; Sun-young Lee
IPC分類
H04N19/52; H04N19/105; H04N19/14; H04N19/176
技術(shù)領(lǐng)域
motion,block,bio,prediction,vector,current,picture,vy,in,subblock
地域： Seoul

摘要

Disclosed herein is a method for adaptive bidirectional optical flow estimation for inter-screen prediction compensation during video encoding. The method aims to reduce complexity and/or cost of bidirectional optical flow (BIO) at a pixel level or a subblock level.

說明書

FIG. 15 is an exemplary diagram illustrating a procedure of performing motion compensation by selectively applying the BIO process based on the CVC condition and the BCC condition according to an embodiment of the present disclosure.

The motion compensation device 1000 determines whether the bidirectional motion vectors (MVx0, MVy0) and (MVx1, MVy1) of the current block satisfy the CVC condition and the BCC condition (S1502). When both conditions are met, the BIO process is skipped and a prediction block is generated according to typical motion compensation (S1504).

On the other hand, when any one of the two conditions is not satisfied, a prediction block of the current block is generated according to the BIO process (S1506).

While FIG. 15 illustrates that the BIO process is skipped when both the CVC condition and the BCC condition are satisfied, this is merely an example. Whether to skip BIO may be determined based on one of the CVC condition and the BCC condition.

Embodiment 4: BIO Skip According to the Degree of Variation of Motion Vectors of Neighboring Blocks

When the bidirectional motion vectors estimated on a per block basis in the neighboring blocks of the current block have similar values, the optical flows estimated on a per pixel basis or per subblock basis in the current block are also likely to have similar values.

權(quán)利要求

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