Picture reconstruction method and apparatus
Embodiments include a picture reconstruction method and apparatus for a video picture. The picture reconstruction method includes: obtaining a prediction mode of a current coding unit, and/or obtaining a prediction partition mode of the current coding unit, where the current coding unit includes a luma coding block and a chroma coding block, and the prediction partition mode is a mode of splitting the current coding unit into prediction blocks or prediction units; obtaining a transform block of the current coding unit based on the prediction partition mode and/or the prediction mode; and generating a reconstructed picture block of the current coding unit based on the transform block. According to the method in the embodiments, video coding efficiency can be improved.
1. A picture reconstruction method, comprising:
obtaining a prediction mode of a current coding unit;
obtaining a prediction partition mode of the current coding unit, wherein the current coding unit comprises a luma coding block and a chroma coding block, and the prediction partition mode is a mode of splitting the current coding unit into prediction blocks or prediction units;
obtaining a transform block of the current coding unit based on the prediction partition mode and the prediction mode; and
generating a reconstructed picture block of the current coding unit based on the transform block, wherein obtaining the transform block of the current coding unit based on the prediction partition mode and the prediction mode further comprises:
when the prediction mode is the intra prediction mode and the prediction partition mode of the luma coding block is either a vertical quartering partition or a vertical asymmetric binary split, splitting the luma coding block through the vertical quartering partition to obtain a luma transform block, and skipping splitting the chroma coding block and using the chroma coding block as a chroma transform block; or
when the prediction mode is the intra prediction mode and the prediction partition mode of the luma coding block is either a horizontal quartering partition or a horizontal asymmetric binary split, splitting the luma coding block through the horizontal quartering partition to obtain a luma transform block, and skipping splitting the chroma coding block and using the chroma coding block as a chroma transform block, and wherein obtaining the transform block of the current coding unit based on the prediction partition mode and the prediction mode further comprises:
when the prediction mode is the inter prediction mode, skipping splitting the current coding unit and using the current coding unit as a transform unit.
2. The method according to claim 1 , wherein obtaining of the prediction mode of the current coding unit further comprises:
obtaining the prediction mode from a bitstream through parsing or derivation, wherein the prediction mode comprises an intra prediction mode and an inter prediction mode.
3. The method according to claim 1 , wherein the obtaining of the prediction partition mode of the current coding unit further comprises:
determining, based on the size of the current coding unit, candidate prediction partition modes that are allowed to be used for the current coding unit; and
determining the prediction partition mode from the candidate prediction partition modes that are allowed to be used.
4. An apparatus comprising:
an obtaining unit configured to:
obtain a prediction mode of a current coding unit
obtain a prediction partition mode of the current coding unit, wherein the current coding unit comprises a luma coding block and a chroma coding block, the prediction partition mode is a mode of splitting the current coding unit into prediction blocks or prediction units,
a processing unit configured to obtain a transform block of the current coding unit based on the prediction partition mode and the prediction mode; and
a reconstruction unit configured to generate a reconstructed picture block of the current coding unit based on the transform to:
when the prediction partition mode of the luma coding block is either a vertical quartering partition or a vertical asymmetric binary split, split the luma coding block through vertical the quartering partition to obtain a luma transform block, and skip splitting the chroma coding block and use the chroma coding block as a chroma transform block; or
when the prediction mode is the intra prediction mode and the prediction partition mode of the luma coding block is either a horizontal quartering partition or a horizontal asymmetric binary split, split the luma coding block through the horizontal quartering partition to obtain a luma transform block, and skip splitting the chroma coding block and use the chroma coding block as a chroma transform block; and
when the prediction mode is the inter prediction mode, skip splitting the current coding unit, and use the current coding unit as a transform unit.
5. The apparatus according to claim 4 , wherein the obtaining unit is further configured to obtain the prediction mode from a bitstream through parsing or derivation, wherein the prediction mode comprises an intra prediction mode and an inter prediction mode.
6. The apparatus according to claim 4 , wherein the obtaining unit is further configured to:
determine, based on a size of the current coding unit, candidate prediction partition modes that are allowed to be used for the current coding unit; and
determine the prediction partition mode from the candidate prediction partition modes that are allowed to be used.
7. A video coding device, comprising:
a memory; and
a processor, wherein the processor is configured to invokes program code stored in the memory to perform the method according to claim 1 .