Methods and apparatuses for encoding and decoding mode information

Patent metadata

Field	Value
Publication number	US-9621899-B2
Application number	US-88467610-A
Country	US
Kind code	B2
Filing date	Sep 17, 2010
Priority date	Sep 17, 2009
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

Methods and apparatuses for encoding and decoding mode information of a block of an image. The method of decoding the mode information includes decoding information representing whether a current block is encoded in a first mode, and hierarchically decoding information representing an encoding mode of the current block from among a second mode and a third mode.

First claim

What is claimed is:

1. A method of decoding mode information of a current block of an image, the method comprising:
decoding first information that indicates whether the current block is encoded in a first encoding mode, from a bitstream;
in response to decoding first information indicating the current block is not encoded in the first encoding mode, decoding second information that indicates an encoding mode of the current block from among a second encoding mode and a third encoding mode; and
determining a decoding mode to be used to decode the current block, based on at least one of the decoded first information and the decoded second information,
wherein the first encoding mode indicates that the current block is identical to a second block that is encoded prior to the current block, the current block adjacent to the second block in a slice of the image.

2. The method of claim 1 , wherein the second encoding mode is an encoding mode that encodes the current block based on discrete cosine transformation (DCT), and
wherein the third encoding mode is an encoding mode that encodes the current block based on a plurality of bit planes of pixel values.

3. The method of claim 1 , wherein the decoding of the first information comprises: selectively parsing the first information, based on third information that indicates whether the slice includes a block that is encoded in the first encoding mode.

4. The method of claim 3 , wherein the selective parsing of the first information comprises:
determining whether the slice includes the block that is encoded in the first encoding mode, based on the third information; and
in response to determining that the slice includes the block that is encoded in the first encoding mode, based on the third information, parsing the first information.

5. The method of claim 3 , wherein the selective parsing of the first information comprises:
determining whether the slice includes the block that is encoded in the first encoding mode, based on the third information, and determining whether the slice includes a block that is encoded in the second encoding mode, or a block that is encoded in the third encoding mode, based on fourth information; and
in response to determining that the slice includes the block that is encoded in the first encoding mode, and the slice includes the block that is encoded in the second encoding mode or the block that is encoded in the third encoding mode, based on the third information and the fourth information, parsing the first information.

6. The method of claim 1 , wherein the decoding of the second information comprises:
in response to determining that the current block is not encoded in the first encoding mode, based on the decoded first information, selectively parsing the second information, based on fourth information that indicates whether the slice includes both a block that is encoded in the second encoding mode and a block that is encoded in the third encoding mode.

7. The method of claim 6 , wherein the selective parsing of the second information comprises:
determining whether the slice includes both the block that is encoded in the second encoding mode and the block that is encoded in the third encoding mode, based on the fourth information; and
in response to determining that the slice includes both the block that is encoded in the second encoding mode and the block that is encoded in the third encoding mode, based on the fourth information, parsing the second information.

8. The method of claim 2 , wherein the second encoding mode is an encoding mode that performs DCT on the pixel values of the current block to generate DCT coefficients, separates the DCT coefficients into a plurality of bit planes from a bit plane of most significant bits (MSBs) to a bit plane of least significant bits (LSBs), and encodes the DCT coefficients in units of bit planes.

9. The method of claim 2 , wherein the third encoding mode is an encoding mode that separates the pixel values of the current block into a plurality of bit planes from a bit plane of most significant bits (MSBs) to a bit plane of least significant bits (LSBs), and encodes the pixel values in units of bit planes.

10. A method of encoding mode information of a current block of an image, the method comprising:
determining an encoding mode of the current block from among a first encoding mode, a second encoding mode, and a third encoding mode;
encoding first information that indicates whether the current block is encoded in the first encoding mode; and
in response to determining that the encoding mode of the current block is not the first encoding mode, encoding second information that indicates whether the encoding mode of the current block is one of the second encoding mode and the third encoding mode,
wherein the first encoding mode indicates that the current block is identical to a second block that is encoded prior to the current block, the current block adjacent to the second block in a slice of the image.

11. The method of claim 10 , wherein the second mode is an encoding mode that encodes the current block based on discrete cosine transformation (DCT), and
wherein the third encoding mode is an encoding mode for the current block based on a plurality of bit planes of pixel values.

12. The method of claim 10 , wherein the encoding of the first information comprises: selectively encoding the first information, based on whether the slice includes a block that is encoded in the first encoding mode.

13. The method of claim 12 , wherein the selective encoding of the first information comprises:
determining whether the slice includes the block that is encoded in the first encoding mode; and
in response to determining that the slice includes the block that is encoded in the first encoding mode, encoding the first information.

14. The method of claim 12 , wherein the selectively encoding of the first information comprises:
determining whether the slice includes the block that is encoded in the first encoding mode and whether the slice includes a block that is encoded in the second encoding mode or a block that is encoded in the third encoding mode; and
in response to determining that the slice includes the block that is encoded in the first encoding mode and the block that is encoded in the second encoding mode or the block that is encoded in the third encoding mode, encoding the first information.

15. The method of claim 10 , wherein the encoding of the second information comprises: in response to determining that the current block is not encoded in the first encoding mode, selectively encoding the second information, based on whether the slice includes both the block that is encoded in the second encoding mode and the block that is encoded in the third encoding mode.

16. The method of claim 15 , wherein the encoding of the second information comprises:
determining whether the slice includes both the block that is encoded in the second encoding mode and the block that is encoded in the third encoding mode; and
in response to determining that the slice includes both the block that is encoded in the second encoding mode and the block that is encoded in the third encoding mode, encoding the second information.

17. The method of claim 11 , wherein the second encoding mode is an encoding mode that performs discrete cosine transformation (DCT) on the pixel values of the current block to generate DCT coefficients, separates the DCT coefficients into a plurality of bit planes from a bit plane of most significant bits (MSBs) to a bit plane of least sign

Assignees

• Park Sung-Bum
• Kim Jung-Woo
• Choi Dai-Woong
• Yoon Jae-Won
• Cho Jun-Ho
• Samsung Electronics Co Ltd

Inventors

• Park Sung-Bum
• Kim Jung-Woo
• Choi Dai-Woong
• Yoon Jae-Won
• Cho Jun-Ho

Classifications

• H04N19/132 Primary

  Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking · CPC title

• H04N19/60

  using transform coding · CPC title

• H04N19/13

  Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC] · CPC title

• H04N19/103

  Selection of coding mode or of prediction mode · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title