Method of sub-prediction unit prediction in 3D video coding
A method for a three-dimensional encoding or decoding system incorporating restricted sub-PU level prediction is disclosed. In one embodiment, the sub-PU level prediction associated with inter-view motion prediction or view synthesis prediction is restricted to the uni-prediction. In another embodiment, the sub-PU partition associated with inter-view motion prediction or view synthesis prediction is disabled if the sub-PU partition would result in sub-PU size smaller than the minimum PU split size or the PU belongs to a restricted partition group. The minimum PU split size may correspond to 8×8. The restricted partition group may correspond to one or more asymmetric motion partition (AMP) modes.
1. A method for three-dimensional or multi-view video encoding or decoding, the method comprising:
receiving input data associated with a current texture PU (prediction unit) in a dependent view;
when a size of the current texture PU is not smaller than a threshold size and the current texture PU corresponds to a symmetric partition:
splitting the current texture PU into sub-PUs;
locating depth sub-blocks or texture sub-blocks in a reference view corresponding to the current texture PU using first derived DVs (disparity vectors); and
generating temporal prediction or inter-view prediction for the current texture PU using SPIVMP (sub-PU level inter-view motion prediction) or VSP (view synthesized prediction), the temporal prediction being based on motion information of the texture sub-blocks in the reference view, and the inter-view prediction being based on warped texture samples in the reference view using the depth sub-blocks;
when the current texture PU corresponds to an asymmetric partition:
locating a depth block or a texture block in the reference view corresponding to the current texture PU using a second derived DV; and
generating the temporal prediction or inter-view prediction for the current texture PU without using the SPIVMP or without using the VSP; and
encoding or decoding the current texture PU using the temporal prediction or the inter-view prediction.
2. The method of claim 1 , wherein the threshold size corresponds to 8×8.
3. The method of claim 1 , wherein the asymmetric partition includes a size of PART_2NxnU, PART_2NxnD, PART_nLx2N, or PART_nRx2N.
4. An apparatus for three-dimensional or multi-view video coding, the apparatus comprising one or more electronic circuits configured to:
receive input data associated with a current texture PU (prediction unit) in a dependent view;
when a size of the current texture PU is not smaller than a threshold size and the current texture PU corresponds to a symmetric partition:
split the current texture PU into sub-PUs;
locate depth sub-blocks or texture sub-blocks in a reference view corresponding to the current texture PU using first derived DVs (disparity vectors); and
generate temporal prediction or inter-view prediction for the current texture PU using SPIVMP (sub-PU level inter-view motion prediction) or VSP (view synthesized prediction), the temporal prediction being based on motion information of the texture sub-blocks in the reference view, and the inter-view prediction being based on warped texture samples in the reference view using the depth sub-blocks;
when the current texture PU corresponds to an asymmetric partition:
locate a depth block or a texture block in the reference view corresponding to the current texture PU using a second derived DV; and
generate the temporal prediction or inter-view prediction for the current texture PU without using the SPIVMP or without using the VSP; and
encode or decode the current texture PU using the temporal prediction or the inter-view prediction.
5. The apparatus of claim 4 , wherein the threshold size corresponds to 8×8.
6. The apparatus of claim 4 , wherein the asymmetric partition includes a size of PART_2NxnU, PART_2NxnD, PART —nLx 2N, or PART —nRx 2N.