Granted Patent B2

US 12,401,800 · App. 18/614,268 · Granted Aug 26, 2025

Inventors: Dong San Jun (Daejeon, KR); Ha Hyun Lee (Seoul, KR); Jung Won Kang (Daejeon, KR); Hyun Suk Ko (Daejeon, KR); Sung Chang Lim (Daejeon, KR); Jin Ho Lee (Daejeon, KR); Seung Hyun Cho (Daejeon, KR); Hui Yong Kim (Daejeon, KR); Jin Soo Choi (Daejeon, KR)

Assignee: LX Semicon Co., Ltd.

H04N19/159H04N19/105H04N19/126H04N19/13H04N19/176H04N19/463H04N19/513H04N19/593H04N19/96

Abstract

Claims (41)

1. A decoding apparatus for image decoding, the decoding apparatus comprising:

a memory; and

at least one processor connected to the memory, the at least one processor configured to:

obtain a plurality of sub-blocks by dividing the current block into sub-block units;

derive a plurality of co-located sub-blocks for the plurality of sub-blocks;

derive sub-block-based temporal merge candidates of the current block based on the plurality of co-located sub-blocks; and

generate a predicted block of the current block based on the sub-block-based temporal merge candidates,

wherein the co-located sub-blocks are located in a collocated picture which is one of reference pictures,

wherein in order to derive the sub-block-based temporal merge candidates of the current block,

based on that motion information of a co-located sub-block for a sub-block is available, motion information of the sub-block is derived by using motion information of the co-located sub-block,

based on that the motion information of the co-located sub-block for the sub-block is not available, the motion information of the sub-block is derived by using motion information of a specific sub-block in a co-located block comprising the co-located sub-block,

wherein the co-located block and co-located sub-blocks are derived by using a motion vector of a neighboring block,

wherein the specific sub-block in the co-located block is a below-right center sub-block located in a bottom right side among four sub-blocks adjoining a center of the co-located block,

wherein a reference picture for the sub-block-based temporal merge candidates is selected as a firstly-ordered picture in a reference picture list for the current block, and

wherein the sub-block-based temporal merge candidates are used for the current block of which size is equal to or greater than 8×8.

2. An image encoding method performed by an encoding apparatus, the method comprising:

a memory; and

at least one processor connected to the memory, the at least one processor configured to:

obtain a plurality of sub-blocks by dividing the current block into sub-block units;

derive a plurality of co-located sub-blocks for the plurality of sub-blocks;

derive sub-block-based temporal merge candidates of the current block based on the plurality of co-located sub-blocks; and

generate a predicted block of the current block based on the sub-block-based temporal merge candidates,

wherein the co-located sub-blocks are located in a collocated picture which is one of reference pictures,

wherein in order to derive the sub-block-based temporal merge candidates of the current block,

based on that motion information of a co-located sub-block for a sub-block is available, motion information of the sub-block is derived by using motion information of the co-located sub-block,

based on that the motion information of the co-located sub-block for the sub-block is not available, the motion information of the sub-block is derived by using motion information of a specific sub-block in a co-located block comprising the co-located sub-block,

wherein the co-located block and co-located sub-blocks are derived by using a motion vector of a neighboring block,

wherein the specific sub-block in the co-located block is a below-right center sub-block located in a bottom right side among four sub-blocks adjoining a center of the co-located block,

wherein a reference picture for the sub-block-based temporal merge candidates is selected as a firstly-ordered picture in a reference picture list for the current block, and

wherein the sub-block-based temporal merge candidates are used for the current block of which size is equal to or greater than 8×8.

3. An apparatus for transmitting image data, the apparatus configured to:

obtain a bitstream generated by an image encoding method, the image encoding method based on obtaining a plurality of sub-blocks by dividing the current block into sub-block units, deriving a plurality of co-located sub-blocks for the plurality of sub-blocks, deriving sub-block-based temporal merge candidates of the current block based on the plurality of co-located sub-blocks, and generating a predicted block of the current block based on the sub-block-based temporal merge candidates; and

transmit the image data comprising the bitstream,

wherein the co-located sub-blocks are located in a collocated picture which is one of reference pictures,

wherein in order to derive the sub-block-based temporal merge candidates of the current block,

based on that motion information of a co-located sub-block for a sub-block is available, motion information of the sub-block is derived by using motion information of the co-located sub-block,

based on that the motion information of the co-located sub-block for the sub-block is not available, the motion information of the sub-block is derived by using motion information of a specific sub-block in a co-located block comprising the co-located sub-block,

wherein the co-located block and co-located sub-blocks are derived by using a motion vector of a neighboring block,

wherein the specific sub-block in the co-located block is a below-right center sub-block located in a bottom right side among four sub-blocks adjoining a center of the co-located block,

wherein a reference picture for the sub-block-based temporal merge candidates is selected as a firstly-ordered picture in a reference picture list for the current block, and

wherein the sub-block-based temporal merge candidates are used for the current block of which size is equal to or greater than 8×8.

Priority Claims (2)

Continuity (4)

References Cited (52)