Efficient transform unit representation
View Patent ↗In one embodiment, a method includes receiving a prediction unit (PU) for a coding unit (CU) of the video content. The method analyzes the prediction unit to determine a size of prediction unit. A size of a transform unit is determined based on the size of the prediction unit based on a set of rules. The set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit. The method then outputs the size of the transform unit for use in a transform operation.
1. A method comprising:
receiving a prediction unit (PU) for a coding unit (CU) of the video content;
determining, by a computing device, a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
outputting the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is not encoded and transmitted with a compressed bitstream of the video content.
2. The method of claim 1 , wherein the set of rules specify the size of the transform unit is set to a size of a largest allowed size that fits in the size of the prediction unit.
3. The method of claim 1 wherein the set of rules specify the size of the transform unit is automatically set to a size of the prediction unit.
4. A method comprising:
receiving a prediction unit (PU) for a coding unit (CU) of the video content;
determining, by a computing device, a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
outputting the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is encoded and transmitted with a compressed bitstream of the video content, the RQT includes a plurality of layers, and the set of rules specify a decision determination for the TU size at at least one layer of the RQT is skipped in determining the size of the transform unit.
5. The method of claim 4 , wherein the at least one layer is a top level layer at a CU size.
6. A method comprising:
receiving a prediction unit (PU) for a coding unit (CU) of the video content;
determining, by a computing device, a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
outputting the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is encoded and transmitted with a compressed bitstream of the video content, the set of rules specify one fixed size of the transform unit is allowed for the prediction unit, and a depth parameter is required to control configuration of the RQT, but not a minimum size parameter for the transform unit and a maximum size parameter for the transform unit.
7. The method of claim 6 , wherein nodes at a same level of the RQT have a same value for a bit representing a split or stop at the node.
8. The method of claim 7 , wherein split or stop bits for nodes at the same level are not encoded for the RQT.
9. A method comprising:
receiving a prediction unit (PU) for a coding unit (CU) of the video content;
determining, by a computing device, a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
outputting the size of the transform unit for use in a transform operation, wherein the set of rules specify the size of the transform unit is set to a size of a largest allowed size that fits in the size of the prediction unit, and a portion of a residual quadtree representation (RQT) for a partitioning of the CU into transform units is encoded and transmitted with a compressed bitstream of the video content based on the size of the largest allowed size that fits in the size of the prediction unit.
10. An apparatus comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a prediction unit (PU) for a coding unit (CU) of the video content;
determine a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
output the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is not encoded and transmitted with a compressed bitstream of the video content.
11. The apparatus of claim 10 , wherein the set of rules specify the size of the transform unit is set to a size of a largest allowed size that fits in the size of the prediction unit.
12. The apparatus of claim 10 , wherein the set of rules specify the size of the transform unit is automatically set to a size of the prediction unit.
13. An apparatus comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a prediction unit (PU) for a coding unit (CU) of the video content;
determine a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
output the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is encoded and transmitted with a compressed bitstream of the video content, wherein the RQT includes a plurality of layers, and the set of rules specify a decision determination for the TU size at at least one layer of the RQT is skipped in determining the size of the transform unit.
14. The apparatus of claim 13 , wherein the at least one layer is a top level layer at a CU size.
15. An apparatus comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a prediction unit (PU) for a coding unit (CU) of the video content;
determine a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
output the size of the transform unit for use in a transform operation, wherein a residual quadtree representation (RQT) for a partitioning of the CU into transform units is encoded and transmitted with a compressed bitstream of the video content, the set of rules specify one fixed size of the transform unit is allowed for the prediction unit, and a depth parameter is required to control configuration of the RQT, but not a minimum size parameter for the transform unit and a maximum size parameter for the transform unit.
16. An apparatus comprising:
one or more computer processors; and
a non-transitory computer-readable storage medium comprising instructions for controlling the one or more computer processors to be operable to:
receive a prediction unit (PU) for a coding unit (CU) of the video content;
determine a size of a transform unit based on a size of the prediction unit based on a set of rules, wherein the set of rules specify the size of the transform unit is linked to the size of prediction unit and not a size of the coding unit; and
output the size of the transform unit for use in a transform operation, wherein the set of rules specify the size of the transform unit is set to a size of a largest square size that fits in the size of the prediction unit, and a portion of a residual quadtree representation (RQT) for the prediction unit is encoded and transmitted with a compressed bitstream of the video content based on the size of the largest allowed size that fits in the size of the prediction unit.