Video coding system with intra prediction mechanism and method of operation thereof
A video coding system, and a method of operation thereof, includes: a source input module for receiving a frame from a video source; and a picture process module, coupled to the source input module, for generating a neighboring coding unit in the frame, for generating an intra block motion vector with a constrained intra prediction flag enabled and the neighboring coding unit generated based on only an intra-picture prediction mode, for generating a current coding unit based on the intra block motion vector, the current coding unit adjacent the neighboring coding unit, and for generating a video bitstream based on the current coding unit for a video decoder to receive and decode for displaying on a device.
1. An encoding device, comprising:
circuitry configured to:
set a constrained intra prediction flag as enable;
restrict a reference block of a reference coding unit to an intra-coded neighboring block;
calculate an intra block motion vector of a current coding unit, based on the set constrained intra prediction flag and the restricted reference block,
wherein the intra block motion vector indicates a displacement between the reference coding unit and the current coding unit;
encode the calculated intra block motion vector; and
generate a bit stream based on the encoded intra block motion vector.
2. The encoding device according to claim 1 , wherein the circuitry is further configured to:
set the intra-coded neighboring block as available;
set an inter-coded neighboring block as unavailable; and
generate the intra block motion vector, based on the intra-coded neighboring unit that is available and the inter-coded neighboring unit that is unavailable.
3. The encoding device according to claim 1 , wherein the circuitry is further configured to set the reference block by an exclusion of the inter-coded neighboring block.
4. The encoding device according to claim 1 , wherein the current coding unit is adjacent to the reference coding unit.
5. An encoding method, comprising:
setting a constrained intra prediction flag as enable;
restricting a reference block of a reference coding unit to an intra-coded neighboring block;
calculating an intra block motion vector of a current coding unit, based on the set constrained intra prediction flag and the restricted reference block,
wherein the intra block motion vector indicates a displacement between the reference coding unit and the current coding unit;
encoding the calculated intra block motion vector; and
generating a bit stream based on the encoded intra block motion vector.
6. The encoding method according to claim 5 , further comprises:
setting the intra-coded neighboring block as available;
setting an inter-coded neighboring block as unavailable; and
generating the intra block motion vector, based on the intra-coded neighboring unit that is available and the inter-coded neighboring unit that is unavailable.
7. The encoding method according to claim 5 , further comprises setting the reference block by an exclusion of the inter-coded neighboring block.
8. The encoding method according to claim 5 , wherein the current coding unit is adjacent to the reference coding unit.