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Video encoding/decoding method and device

專利號
US11659163B2
公開日期
2023-05-23
申請人
INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY（KR Seoul）
發(fā)明人
Jong Ki Han; Sang Guk Cha; Geon Won Lee; Geun Bae Kim
IPC分類
H04N19/159; H04N19/105; H04N19/176; H04N19/46
技術(shù)領(lǐng)域
mpm,prediction,candidate,mode,intra,may,group,be,block,unit
地域： Seoul

摘要

A video encoding/decoding device according to the present invention may determine an intra prediction mode of a current block on the basis of a most probable mode (MPM) of the current block or an intra prediction mode of a neighboring block, determine a reference region for intra prediction of the current block, and perform intra prediction on the current block by using the intra prediction mode and the reference region.

說明書

When a reference line is unavailable, a reference line at a corresponding position may be excluded from a reference region. Alternatively, an unavailable reference line may be substituted by using an available reference line. Herein, an available reference line may include a peripheral sample of an unavailable reference line, a peripheral sample of a current block, etc. Herein, a peripheral sample may mean a sample neighboring at least one of a left, right, top, bottom or diagonal direction.

In reference to FIG. 3, intra prediction for a current block may be performed by using an intra prediction mode of a current block and a reference region S320.

FIGS. 4A-4B to 5 show a method in which a second candidate group is determined as an embodiment to which the present disclosure is applied.

A second candidate group may be determined by an operation which subtracts/adds a predetermined value of m from/to a MPM (embodiment 1). The operation may be performed for a plurality of MPM, respectively. It may be restricted so that the operation is not performed for a planar mode or a DC mode among the MPM. Herein, a value of m may be an integer such as 2, 3, 4, or more. The value of m may be greater than a value of n mentioned in FIG. 3.

The above-described subtraction/addition operation may be performed based on a result of comparison between a mode value of a MPM and a base mode value. A base mode value may mean mode 2, mode 18 (a horizontal mode), mode 34 (a diagonal mode), mode 50 (a vertical mode) or mode 66. In this description, mode A may mean an intra prediction mode having a mode value of A.

權(quán)利要求

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