Granted Patent B2

US 9,667,994 · App. 14/038,536 · Granted May 30, 2017

Abstract

Claims (49)

1. A method of decoding video data, the method comprising:

based on a chroma sampling format of a coding unit, determining, for a leaf node of the coding unit, that a non-square rectangular chroma block comprises a first square sub-block and a second square sub-block, wherein the leaf node of the coding unit corresponds to a node of a quadtree with no child nodes;

obtaining a first block of intra-predicted chroma data associated with the first square sub-block:

inverse quantizing transform coefficients associated with the first square sub-block;

inverse transforming the inverse quantized transform coefficients to generate first residual data

adding the first residual data to the first block of intra-predicted chroma data to reconstruct the first square sub-block;

intra-predicting the second square sub-block using reference samples from the reconstructed first square sub-block, wherein intra-predicting the second square sub-block comprises generating a second block of intra-predicted chroma data using reference samples from the reconstructed first square sub-block; and

reconstructing the second square sub-block using the second block of intra-predicted chroma data and second residual data for the second square sub-block.

2. The method of claim 1 , further comprising generating the second block of intra-predicted chroma data using intra-prediction samples of a neighboring block that is in addition to the reconstructed first square sub-block.

3. The method of claim 2 , wherein the first square sub-block is a top block of the non-square rectangular chroma block and the second square sub-block is a bottom block of the non-square rectangular chroma block.

4. A method of encoding video data, the method comprising:

based on a chroma sampling format of a coding unit, determining that a leaf node of the coding unit comprises a non-square rectangular chroma block comprising a first square sub-block and a second square sub-block, wherein the leaf node of the coding unit corresponds to a node of a quadtree with no child nodes;

quantizing transform coefficients associated with the first square sub-block;

transforming the inverse quantized transform coefficients to generate first residual data; reconstructing reference samples for the first square sub-block based on the first residual data; and

intra-predicting the second square sub-block using the reference samples for the reconstructed first square sub-block, wherein intra-predicting the second square sub-block comprises:

generating a second block of intra-predicted chroma data based on intra-prediction samples in the first square sub-block; and

encoding, for the second square sub-block, second residual data.

5. The method of claim 4 , further comprising encoding the second block of intra-predicted chroma data using other reference samples in addition to the reference sample of the reconstructed first square sub-block.

6. The method of claim 5 , wherein the first square sub-block is a top block of the non-square rectangular chroma block and the second square sub-block is a bottom block of the non-square rectangular chroma block.

7. An apparatus for decoding video data comprising:

a memory configured to store video data; and

one or more processors configured to:

based on a chroma sampling format of a coding unit of the video data, determine, for a leaf node of the coding unit, that a non-square rectangular chroma block comprises a first square sub-block and a second square sub-block, wherein the leaf node of the coding unit corresponds to a node of a quadtree with no child nodes;

obtain a first block of intra predicted chroma data associated with the first square sub-block;

inverse quantize transform coefficients associated with the first square sub-block;

inverse transform the inverse quantized transform coefficients to generate first residual data

add the first residual data to the first block of intra-predicted chroma data to reconstruct the first square sub-block;

intra-predict the second square sub-block using reference samples from the reconstructed first square sub-block, wherein to intra-predict the second square sub-block the one or more processors are configured to generate a second block of intra-predicted chroma data using reference samples from the reconstructed first square sub-block; and

reconstruct the second square sub-block using the second block of intra-predicted chroma data and second residual data for the second square sub-block.

8. The apparatus of claim 7 , wherein the one or more processors are further configured to encode the second block of intra-predicted chroma data using other reference samples in addition to the reference samples of the reconstructed first square sub-block.

9. The apparatus of claim 8 , wherein the first square sub-block is a top block of the non-square rectangular chroma block and the second square sub-block is a bottom block of the non-square rectangular chroma block.

10. An apparatus for decoding video data comprising:

means for determining, for a leaf node of the coding unit based on a chroma sampling format of a coding unit, that a non-square rectangular chroma block comprises a first square sub-block and a second square sub-block, wherein the leaf node of the coding unit corresponds to a node of a quadtree with no child nodes;

means for obtaining a first block of intra predicted chroma data associated with the first square sub-block;

means for inverse quantizing transform coefficients associated with the first square sub-block;

means for inverse transforming the inverse quantized transform coefficients to generate first residual data;

means for adding the first residual data to the first block of intra-predicted chroma data to reconstruct the first square sub-block;

means for intra-predicting the second square sub-block using reference samples from the reconstructed first square sub-block, wherein the means for intra-predicting the second square sub-block comprises means for generating a second block of intra-predicted chroma data using reference samples from the reconstructed first square sub-block; and

means for reconstructing the second square sub-block using the second block of intra-predicted chroma data and second residual data for the second square sub-block.

11. The apparatus of claim 10 , further comprising means for generating the second block of intra-predicted chroma data using other reference samples in addition to the reference samples from the reconstructed first square sub-block.

12. The apparatus of claim 11 , wherein the first square sub-block is a top block of the non-square rectangular chroma block and the second square sub-block is a bottom block of the non-square rectangular chroma block.

13. A non-transitory computer readable storage medium storing instructions that upon execution by one or more processors cause the one or more processors to:

based on a chroma sampling format of a coding unit, determine, for a leaf node of the coding unit, that a non-square rectangular chroma block comprising a first square sub-block and a second square sub-block, wherein the leaf node of the coding unit corresponds to a node of a quadtree with no child nodes;

obtain a first block of intra predicted chroma data associated with the first square sub-block;

inverse quantize transform coefficients associated with the first square sub-block;

inverse transform the inverse quantized transform coefficients to generate first residual data;

add the first residual data to the first block of intra-predicted chroma data to reconstruct the first square sub-block;

intra-predict the second square sub-block using reference samples from the reconstructed first square sub-block, wherein intra-predicting the second square sub-block comprises generating a second block of intra-predicted chroma data using reference samples from the reconstructed first square sub-block; and

reconstructing the second square sub-block using the second block of intra-predicted chroma data and second residual data for the second square sub-block.

Assignments (6)