Image processing device and method

• US 10,659,792 B2
• Filed: 10/08/2018
• Issued: 05/19/2020
• Est. Priority Date: 04/09/2010
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Sasaki, Masao
• Primary Examiner(s): Carter, Aaron W
• Application Number:
  US16/153,904
• Publication Number:
  US 20190058888A1
• Time in Patent Office: 589 Days
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513
• CPC Class Codes: H04N 19/436 using parallelised computational arrangements
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

An image processing device for encoding a video signal including circuitry configured to perform an arithmetic encoding process on a top block of a current block line of the video signal using a context used in the arithmetic encoding process for a previous block of a previous block line.

Claims

1. A decoding method for decoding a bit stream, comprising:

performing arithmetic decoding of block lines of a first slice of the bit stream, and performing arithmetic decoding of block lines of a second slice of the bit stream; and

performing arithmetic decoding, by circuitry of an image processing device, on a top block of a current block line in the second slice, by using a context updated in case of decoding a previous block of a previous block line, the previous block line being located above adjacent to the current block line, the previous block being different from a top block of the previous block line which is located above adjacent to the top block of the current block line, and the previous block being other than a last block in decoding order in the previous block line in the first slice.

2. The decoding method according to claim 1, further comprising:

performing arithmetic decoding, by the circuitry, so as to use the context used in the arithmetic decoding for the previous block of the previous block line as an initial value.

3. The decoding method according to claim 2, further comprising:

performing arithmetic decoding, by the circuitry, so as to use a stage of a probability table used in the arithmetic decoding for the previous block of the previous block line as the initial value.

4. The decoding method according to claim 3, wherein the previous block line is a neighboring block line on top of the current block line.

5. The decoding method according to claim 4, wherein the second slice is a current slice and the first slice is a previous slice.

6. The decoding method according to claim 4, further comprising:

performing arithmetic decoding, by the circuitry, on the top block of the current block line of the bit stream to generate quantized data;

inversely quantizing the quantized data to generate transformed data; and

inversely transforming the transformed data to a video signal.

13. The decoding method according to claim 1, wherein the first slice and the second slice are adjacent at a slice boundary as an object.

15. The decoding method according to claim 1, further comprising:

initializing a context for decoding the top block of the current block line in the second slice by the context updated in case of decoding the previous block of the previous block line.

16. The decoding method according to claim 13, wherein

the block lines of the first slice of the bit stream are encoded by performing arithmetic encoding of the block lines of the first slice in an order from bottom to top, and the block lines of the second slice of the bit stream are encoded by performing arithmetic encoding of the block lines of the second slice in an order from top to bottom.

7. An image processing device for decoding a bit stream, comprising:

circuitry configured to;

perform arithmetic decoding of block lines of a first slice of the bit stream, and perform arithmetic decoding of block lines of a second slice of the bit stream; and

perform arithmetic decoding on a top block of a current block line in the second by using a context updated in case of decoding a previous block of a previous block line, the previous block line being located above adjacent to the current block line, the previous block being different from a top block of the previous block line which is located above adjacent to the top block of the current block line, and the previous block being other than a last block in decoding order in the previous block line in the first slice.

8. The image processing device according to claim 7, wherein the circuitry is configured to perform arithmetic decoding so as to use the context used in the arithmetic decoding process for the previous block of the previous block line as an initial value.

9. The image processing device according to claim 8, wherein the circuitry is configured to perform arithmetic decoding so as to use a stage of a probability table used in the arithmetic decoding process for the previous block of the previous block line as the initial value.

10. The image processing device according to claim 9, wherein the previous block line is a neighboring block line on top of the current block line.

11. The image processing device according to claim 10, wherein the second slice is a current slice and the first slice is a previous slice.

12. The image processing device according to claim 10, wherein the circuitry is configured to

perform arithmetic decoding on the top block of the current block line of the hit stream to generate quantized data;

inversely quantize the quantized data to generate transformed data; and

inversely transform the transformed data to a video signal.

14. The image processing device according to claim 7, wherein the first slice and the second slice are adjacent at a slice boundary as an object.

17. The image processing device according to claim 7, wherein the circuitry is configured to initialize a context for decoding the top block of the current block line in the second slice by the context updated in case of decoding the previous block of the previous block line.

18. The image processing device according to claim 14, wherein the block lines of the first slice of the bit stream are encoded by performing arithmetic encoding of the block lines of the first slice in an order from bottom to top, and the block lines of the second slice of the bit stream are encoded by performing arithmetic encoding of the block lines of the second slice in an order from top to bottom.