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Video encoding/decoding method and device

專利號(hào)
US11659163B2
公開日期
2023-05-23
申請(qǐng)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

A second candidate group may be also determined based on a position of a region to which a MPM belongs (embodiment 3). Predefined intra prediction modes in an encoding/decoding device may be classified into a plurality of regions. For convenience of description, FIG. 5 shows that predefined intra prediction modes are classified into 4 regions.

In reference to FIG. 5, a first region (R1) may include mode 2 to mode 17, a second region (R2) may include mode 18 to mode 33, a third region (R3) may include mode 34 to mode 49 and a fourth region (R4) may include mode 50 to mode 66.

A second candidate group may be determined based on an intra prediction mode of a region adjacent to a region to which a MPM belongs. For example, when a MPM belongs to a first region, a second candidate group may be determined from at least one of a second region or a fourth region. In this case, a second candidate group may be determined based on the minimum value, the maximum value, a center value or a base mode value of intra prediction modes belonging to the corresponding region.

Alternatively, a second candidate group may be determined based on an intra prediction mode of a region non-adjacent to a region to which a MPM belongs. For example, when a MPM belongs to a second region, a second candidate group may be determined from a fourth region. Alternatively, when a MPM belongs to a third region, a second candidate group may be determined from a first region. In this case, a second candidate group may be determined based on the minimum value, the maximum value, a center value or a base mode value of intra prediction modes belonging to the corresponding region.

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