Prediction mode determining method and apparatus, encoding device, and decoding device

A prediction mode determining apparatus, comprising:

• a memory;
• and
• a processor coupled to the memory and configured to
• determine a split mode for a current picture block;
• determine that a first picture subblock that meets a preset condition is obtained after the current picture block is split in the split mode;
• split the current picture block in the split mode to obtain a plurality of picture subblocks in response to the judging module determining that the first picture subblock is obtained after the current picture block is split, wherein the plurality of picture subblocks comprise the first picture subblock;
• and
• determine that a same prediction mode is useable for the plurality of picture subblocks, wherein the prediction mode for the plurality of picture subblocks is an intra prediction mode or an inter prediction mode, and wherein the inter prediction mode comprises a skip mode, a direct mode, or a common inter mode,
• wherein the first picture subblock is obtained when an area of the current picture block meets following condition:
• in response to the split mode being a binary tree (BT) split mode, a size C/2 is less than S, wherein the size C is the area of the current picture block, and S is a preset area threshold;
• or
• in response to the split mode being a quadtree (QT) split mode, a size C/4 is less than S;
• or
• in response to the split mode being an extended quadtree (EQT) split mode, a size C/4 is less than S.

A video encoding device, comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to execute programming instructions stored in the memory, that causes the processor to
• determine a split mode for a current picture block;
• determine whether a first picture subblock that meets a preset condition is obtained after the current picture block is split in the split mode;
• split the current picture block in the split mode to obtain a plurality of picture subblocks in response to determining that the first picture subblock is obtained after the current picture block is split, wherein the plurality of picture subblocks comprise the first picture subblock;
• and
• determine that a same prediction mode is used for the plurality of picture subblocks, wherein the prediction mode for the plurality of picture subblocks is an intra prediction mode or an inter prediction mode, and wherein the inter prediction mode includes a skip mode, a direct mode, or a common inter mode,
• wherein the first picture subblock is obtained when an area of the current picture block meets following condition:
• in response to the split mode being a binary tree (BT) split mode, a size C/2 is less than S, wherein the size C is the area of the current picture block, and S is a preset area threshold;
• or
• in response to the split mode being a quadtree (QT) split mode, a size C/4 is less than S;
• or
• in response to the split mode being an extended quadtree (EQT) split mode, a size C/4 is less than S.

A video decoding device, comprising:

• a memory;
• and
• a processor coupled to the memory, wherein the processor is configured to execute programming instructions stored in the memory, that causes the processor to
• determine a split mode for a current picture block;
• determine whether a first picture subblock that meets a preset condition is obtained after the current picture block is split in the split mode;
• split the current picture block in the split mode to obtain a plurality of picture subblocks in response to determining that the first picture subblock is obtained after the current picture block is split, wherein the plurality of picture subblocks comprise the first picture subblock;
• and
• determine that a same prediction mode is used for the plurality of picture subblocks, wherein the prediction mode for the plurality of picture subblocks is an intra prediction mode or an inter prediction mode, and wherein the inter prediction mode includes a skip mode, a direct mode, or a common inter mode,
• wherein the first picture subblock is obtained when an area of the current picture block meets following condition:
• in response to the split mode being a binary tree (BT) split mode, a size C/2 is less than S, wherein the size C is the area of the current picture block, and S is a preset area threshold;
• or
• in response to the split mode being a quadtree (QT) split mode, a size C/4 is less than S;
• or
• in response to the split mode being an extended quadtree (EQT) split mode, a size C/4 is less than S.