Methods of depth based block partitioning
A method of simplified depth-based block partitioning (DBBP) for three-dimensional and multi-view video coding is disclosed. In one embodiment, the method receives input data associated with a current texture block in a dependent view, and determines a corresponding depth block or a reference texture block in a reference view for the current texture block. Then, the method derives a representative value based on the corresponding depth block or the reference texture block, and generates a current segmentation mask from the corresponding depth block or the reference texture block. Then, the method selects a current block partition from block partition candidates, wherein the representative value is used for generating the segmentation mask or selecting the current block partition or both, and applies DBBP coding to the current texture block according to the current segmentation mask generated and the current block partition selected.
1. A method of depth-based block partitioning (DBBP) for multi-view video coding or three-dimensional (3D) video coding, the method comprising:
receiving input data associated with a current texture block in a dependent view;
determining a corresponding depth block or a reference texture block in a reference view for the current texture block;
deriving a representative value based on the corresponding depth block or the reference texture block;
generating a current segmentation mask from the corresponding depth block or the reference texture block;
selecting a current block partition from block partition candidates, wherein the representative value is used for generating the segmentation mask or selecting the current block partition or both; and
applying DBBP coding to the current texture block according to the current segmentation mask generated and the current block partition selected,
wherein the representative value is calculated from partial samples of the corresponding depth block or the reference texture block, and the partial samples correspond to only four corner samples of the corresponding depth or the reference texture block, and the texture block corresponds to a coding tree unit (CTU), a coding tree block (CTB), a coding unit (CU), or a prediction unit (PU).
2. The method of claim 1 , wherein the representative value corresponds to an average or a sum of the partial samples of the corresponding depth block or the reference texture block.
3. The method of claim 1 , wherein said deriving the representative value is performed during said generating the current segmentation mask.
4. The method of claim 1 , further comprising signaling one or more flags in the video bitstream to indicate the block partition candidate selected as the current block partition.
5. The method of claim 1 , further comprising signaling one or more flags in the video bitstream to indicate a partition direction of the block partition candidate selected as the current block partition.
6. An apparatus of depth-based block partitioning (DBBP) for multi-view video coding or three-dimensional (3D) video coding, the apparatus comprising one or more electronic circuits or processors arranged to:
receive input data associated with a current texture block in a dependent view;
determine a corresponding depth block or a reference texture block in a reference view for the current texture block;
derive a representative value based on the corresponding depth block or the reference texture block;
generate a current segmentation mask from the corresponding depth block or the reference texture block;
select a current block partition from block partition candidates, wherein the representative value is used for generating the segmentation mask or selecting the current block partition or both; and
apply DBBP coding to the current texture block according to the current segmentation mask generated and the current block partition selected,
wherein the representative value is calculated from partial samples of the corresponding depth block or the reference texture block, and the partial samples correspond to only four corner samples of the corresponding depth or the reference texture block, and the texture block corresponds to a coding tree unit (CTU), a coding tree block (CTB), a coding unit (CU), or a prediction unit (PU).