Picture prediction method and apparatus, and computer-readable storage medium

An apparatus, comprising:

• one or more processors;
• and
• a memory configured to store a program, which when executed by the one or more processors, cause the one or more processors perform operations, the operations comprising:
• determining whether a merge mode is used for a current picture block;
• when the merge mode is used for the current picture block, determining whether a level-1 merge mode is available;
• when the level-1 merge mode is unavailable, determining a target merge mode from a level-2 merge mode, wherein the level-2 merge mode comprises a triangle partition mode (TPM) mode and a combined intra and inter prediction (CIIP) mode;
• and
• when the CIIP mode is allowed to be used, and any one of conditions 1-5 is not met, determining the CIIP mode as the target merge mode;
• wherein
• the condition 1:
• the TPM mode is allowed to be used;
• the condition 2:
• a type of a slice or slice group in which the current picture block is located is bi-directional;
• the condition 3:
• a maximum quantity of candidate TPM modes supported by the slice or the slice group in which the current picture block is located is determined to be greater than or equal to 2;
• the condition 4:
• a size of the current picture block meets a preset condition;
• and
• the condition 5:
• a skip mode is not used to predict the current picture block.

A non-transitory computer-readable medium storing computer instructions, that when executed by one or more processor, cause the one or more processor to perform operations, the operations comprising:

• determining whether a merge mode is used for a current picture block;
• when the merge mode is used for the current picture block, determining whether a level-1 merge mode is available;
• when the level-1 merge mode is unavailable, determining a target merge mode from a level-2 merge mode, wherein the level-2 merge mode comprises a triangle partition mode (TPM) mode and a combined intra and inter prediction (CIIP) mode;
• and
• when the CIIP mode is allowed to be used, and any one of conditions 1-5 is not met, determining the CIIP mode as the target merge mode;
• wherein
• the condition 1:
• the TPM mode is allowed to be used;
• the condition 2:
• a type of a slice or slice group in which the current picture block is located is bi-directional;
• the condition 3:
• a maximum quantity of candidate TPM modes supported by the slice or the slice group in which the current picture block is located is determined to be greater than or equal to 2;
• the condition 4:
• a size of the current picture block meets a preset condition;
• and
• the condition 5:
• a skip mode is not used to predict the current picture block.