Granted Patent B2

US 12,225,185 · App. 17/981,841 · Granted Feb 11, 2025

Inventors: Joo Hee Moon (Seoul, KR); Dong Jae Won (Goyang-si, KR); Sung Won Lim (Seoul, KR)

Assignee: INDUSTRY ACADEMY COOPERATION FOUNDATION OF SEJONG UNIVERSITY

H04N19/103H04N19/117H04N19/119H04N19/159H04N19/176H04N19/51

Abstract

Claims (29)

1. A method of decoding an image signal, comprising:

dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;

generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block; and

generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block,

wherein the first sub-block includes a top-left pixel in the current coding block,

wherein the second sub-block includes a bottom-right pixel in the current coding block,

wherein a size of the second sub-block is ¼ of a size of the current coding block, and

wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.

2. The method of claim 1 , wherein a division type of the division of the current coding block is determined based on division type information signaled from a bitstream.

3. The method of claim 2 , wherein the division type of the division of the current coding block includes dividing the current coding block into ¼ size.

4. The method of claim 3 , wherein whether to divide the current coding block is determined based on mode information signaled from the bitstream.

5. A method of encoding an image signal, comprising:

dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;

generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block; and

generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block,

wherein the first sub-block includes a top-left pixel in the current coding block,

wherein the second sub-block includes a bottom-right pixel in the current coding block,

wherein a size of the second sub-block is ¼ of a size of the current coding block, and

wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.

6. A method of transmitting a bitstream, comprising:

dividing a current coding block into a plurality of sub-blocks, the plurality of sub-blocks including a first sub-block and a second sub-block;

generating a prediction sample of the first sub-block by using an intra prediction mode derived from a neighboring block, the neighboring block including at least one of a rightmost neighboring block among top neighboring blocks adjacent to the current coding block or a bottommost neighboring block among left neighboring blocks adjacent to the current coding block;

generating a prediction sample of the second sub-block by using the intra prediction mode used to generate the prediction sample of the first sub-block;

generating the bitstream by encoding the current block based on the prediction sample of the first sub-block and the prediction sample of the second sub-block; and

transmitting the bitstream,

wherein the first sub-block includes a top-left pixel in the current coding block,

wherein the second sub-block includes a bottom-right pixel in the current coding block,

wherein a size of the second sub-block is ¼ of a size of the current coding block, and

wherein the intra prediction mode is a directional intra prediction mode or a non-directional intra prediction mode.

Priority Claims (3)

Continuity (4)

References Cited (38)