Patent ID: 11962802
Assignee: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. The method according to claim 11, wherein in case that width of the current block is greater than height of the current block and a width to height ratio is greater than or equal to 2:
when the width to height ratio is 2 and the first intra prediction mode index is less than 8, determining the second intra prediction mode index based on a sum of the first intra prediction mode index and the first preset value 65,
when the width to height ratio is 4 and the first intra prediction mode is less than 12, determining the second intra prediction mode index based on the sum of the first intra prediction mode index and the first preset value 65,
when the width to height ratio is 8 and the first intra prediction mode is less than 14, determining the second intra prediction mode index based on the sum of the first intra prediction mode index and the first preset value 65;
when the width to height ratio is 16 and the first intra prediction mode is less than 16, determining the second intra prediction mode index based on the sum of the first intra prediction mode index and the first preset value 65;
wherein a range of the second intra prediction mode index is 8 to 80;
wherein in case that the height of the current block is greater than the width of the current block and the height to width ratio is greater than or equal to 2:
when the height to width ratio is 2 and the first intra prediction mode index is greater than 60, determining the second intra prediction mode index based on a difference between the first intra prediction mode index and the second preset value 67;
when the height to width ratio is 4 and the first intra prediction mode index is greater than 58, determining the second intra prediction mode index based on the difference between the first intra prediction mode index and the second preset value 67;
when the height to width ratio is 8 and the first intra prediction mode index is greater than 56, determining the second intra prediction mode index based on the difference between the first intra prediction mode index and the second preset value 67;
when the height to width ratio is 16 and the first intra prediction mode index is greater than 54, determining the second intra prediction mode index based on the difference between the first intra prediction mode index and the second preset value 67;
wherein a range of the second intra prediction mode index is −14 to 60.