Image processing to encode and decode images based on square and non-square quantization matrices

Patent metadata

Field	Value
Publication number	US-10070131-B2
Application number	US-201715406911-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	May 20, 2011
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

There is provided an image processing device including a decoding section that decodes an encoded stream and generates quantized transform coefficient data, and an inverse quantization section that, taking transform coefficient data as transform units to be used during inverse orthogonal transform, inversely quantizes the quantized transform coefficient data decoded by the decoding section, such that in a case where a non-square transform unit is selected, the inverse quantization section uses a non-square quantization matrix, corresponding to a non-square transform unit, that is generated from a square quantization matrix corresponding to a square transform unit.

First claim

The invention claimed is:

1. An image processing device, comprising:
a processor configured to:
generate a non-square quantization matrix based on a copy of one of row elements at an interval or column elements at the interval of a square quantization matrix,
wherein the interval is based on a ratio of a size of a short edge of the non-square quantization matrix to a size of an edge of the square quantization matrix, and
wherein the non-square quantization matrix corresponds to a non-square transform unit and the square quantization matrix corresponds to a square transform unit;

quantize transform coefficient data based on the non-square quantization matrix; and
encode the quantized transform coefficient data to generate a bit stream.

2. The image processing device according to claim 1 , wherein a size of a long edge of the non-square quantization matrix is equal to a size of the edge of the square quantization matrix.

3. The image processing device according to claim 1 , wherein one of the row elements or the column elements of the square quantization matrix are based on a position associated with the square quantization matrix.

4. The image processing device according to claim 1 ,
wherein the ratio is 1:4, and
wherein the interval is one of four rows or four columns.

5. The image processing device according to claim 1 ,
wherein a size of the square quantization matrix is 4×4, and
wherein a size of the non-square quantization matrix is one of 1×4 or 4×1.

6. The image processing device according to claim 1 ,
wherein a size of the square quantization matrix is 8×8, and
wherein a size of the non-square quantization matrix is one of 2×8 or 8×2.

7. The image processing device according to claim 1 ,
wherein a size of the square quantization matrix is 16×16, and
wherein a size of the non-square quantization matrix is one of 4×16 or 16×4.

8. The image processing device according to claim 1 ,
wherein a size of the square quantization matrix is 32×32, and
wherein a size of the non-square quantization matrix is one of 8×32 or 32×8.

9. The image processing device according to claim 1 , wherein the processor is further configured to orthogonally transform image data based on the non-square transform unit to generate the transform coefficient data.

10. An image processing method, comprising:
generating a non-square quantization matrix based on a copy of one of row elements at an interval or column elements at the interval of a square quantization matrix,
wherein the interval is based on a ratio of a size of a short edge of the non-square quantization matrix to a size of an edge of the square quantization matrix,
wherein the non-square quantization matrix corresponding to a non-square transform unit and the square quantization matrix corresponding to a square transform unit;

quantizing transform coefficient data based on the non-square quantization matrix; and
encoding the quantized transform coefficient data to generate a bit stream.

Assignees

• Sony Corp

Inventors

• Sakurai Hironari
• Tanaka Junichi

Classifications

• H04N19/46

  Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence) · CPC title

• H04N19/134

  characterised by the element, parameter or criterion affecting or controlling the adaptive coding · CPC title

• H04N19/597 Primary

  specially adapted for multi-view video sequence encoding · CPC title

• H04N19/30

  using hierarchical techniques, e.g. scalability (H04N19/63 takes precedence) · CPC title

• H04N19/129

  Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO] · CPC title