Method for encoding/decoding block information using quad tree, and device for using same

• US 10,674,169 B2
• Filed: 09/18/2018
• Issued: 06/02/2020
• Est. Priority Date: 10/04/2010
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Kim, Jong Ho, Kim, Hui Yong, Jeong, Se Yoon, Lim, Sung Chang, Lee, Ha Hyun, Lee, Jin Ho, Cho, Suk Hee, Choi, Jin Soo, Kim, Jin Woong, Ahn, Chie Teuk, Kim, Mun Churl, Lee, Bum Shik
• Primary Examiner(s): Habib, Irfan
• Application Number:
  US16/134,131
• Publication Number:
  US 20190037228A1
• Time in Patent Office: 623 Days
• CPC Class Codes: H04N 19/18 the unit being a set of transform coefficients
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/64 characterised by ordering of coefficients or of bits for transmission
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

Disclosed decoding method of the intra prediction mode comprises the steps of: determining whether an intra prediction mode of a present prediction unit is the same as a first candidate intra prediction mode or as a second candidate intra prediction mode on the basis of 1-bit information; and determining, among said first candidate intra prediction mode and said second candidate intra prediction mode, which candidate intra prediction mode is the same as the intra prediction mode of said present prediction unit on the basis of additional 1-bit information, if the intra prediction mode of the present prediction unit is the same as at least either the first candidate intra prediction mode or the second candidate intra prediction mode, and decoding the intra prediction mode of the present prediction unit.

Claims

1. A video decoding method comprising:

decoding integrated code block flag information in a coding unit;

decoding a split information flag based on the integrated code block flag information and size information in a first transform block; and

decoding code block flag information in the first transform block in a case that the first transform block is not additionally split into a plurality of second transform blocks based on the split information flag, wherein

the split information flag is not decoded in a case that transform coefficients of the first transform block are not present,

the code block flag information in the first transform block is decoded without decoding the split information flag in a case that a size of the first transform block is equal to a predetermined size,

the first transform block is not additionally split into the plurality of the second transform blocks in a case that a value of the split information flag is equal to a predetermined value,

the integrated code block flag is decoded in a case that a transform depth of the first transform block is 0, and

flag information indicating whether a Luma component in the first transform block includes one or more transform coefficients other than 0 is decoded as the code block flag information in a case that the first transform block is not additionally split.

2. The video decoding method of claim 1, wherein

the integrated code block flag information is applied in only the predetermined transform depth in the first transform block.

3. The video decoding method of claim 1, wherein

the integrated code block flag represents whether transform coefficients of luminance signal and chrominance signal are present.

4. The video decoding method of claim 1, further comprising:

generating a reconstructed block using intra prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block.

5. The video decoding method of claim 4, wherein

a size of the prediction block and the size of the first transform block are different.

6. The video decoding method of claim 1, further comprising:

generating a reconstructed block using inter prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block, wherein

the intra prediction for the prediction block is performed using a merge mode or an advanced motion vector prediction mode.

7. A video encoding method comprising:

encoding integrated code block flag information in a coding unit;

encoding a split information flag based on the integrated code block flag information and size information of a first transform block; and

encoding code block flag information of the first transform block in a case that the first transform block is not additionally split into a plurality of second transform blocks based on the split information flag, wherein

the split information flag is not encoded in a case that transform coefficients of the first transform block are not present,

the code block flag information of the first transform block is encoded without encoding the split information flag in a case that a size of the first transform block is equal to a predetermined size,

the first transform block is not additionally split into the plurality of the second transform blocks in a case that a value of the split information flag is equal to a predetermined value,

the integrated code block flag is encoded in a case that a transform depth of the first transform block is 0, and

flag information indicating whether a Luma component in the first transform block includes one or more transform coefficients other than 0 is encoded as the code block flag information in a case that the first transform block is not additionally split.

8. The video encoding method of claim 7, wherein

the integrated code block flag information is applied in only the predetermined transform depth in the first transform block.

9. A non-transitory computer readable medium storing a bitstream generated by the video encoding method of claim 7.

10. The video encoding method of claim 7, wherein

the integrated code block flag represents whether transform coefficients of luminance signal and chrominance signal are present.

11. The video encoding method of claim 7, further comprising:

generating a reconstructed block using intra prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block.

12. The video encoding method of claim 11, wherein

a size of the prediction block and the size of the first transform block are different.

13. The video encoding method of claim 7, further comprising:

generating a reconstructed block using inter prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block, wherein

the intra prediction for the prediction block is performed using a merge mode or an advanced motion vector prediction mode.

14. A non-transitory computer readable medium storing a bitstream, the bitstream comprising:

integrated code block flag information of a coding unit, wherein

the bitstream includes a split information flag in a case that a value of the integrated code block flag is equal to a first predetermined value and a size of a first transform block corresponds to a predetermined range,

code block flag information of the first transform block is present in the bitstream in a case that the first transform block is not additionally split into a plurality of second transform blocks based on the split information flag, and

the split information flag is not present in the bitstream in a case that transform coefficients of the first transform block are not present in the bitstream,

the code block flag information in the first transform block is present in the bitstream, and the split information flag is not present in the bitstream in a case that a size of the first transform block is equal to a predetermined size,

the first transform block is not additionally split into the plurality of four second blocks in a case that a value of the split information flag is equal to a second predetermined value,

the integrated code block flag is present in the bitstream in a case that a transform depth of the first transform block is 0, and

flag information indicating whether a Luma component in the first transform block includes one or more transform coefficients other than 0 is present in the bitstream as the code block flag information in a case that the first transform block is not additionally split.

15. The non-transitory computer readable medium of the claim 14, wherein

the integrated code block flag information is applied in only the predetermined transform depth in the first transform block.

16. The non-transitory computer readable medium of claim 14, wherein

the integrated code block flag represents whether transform coefficients of luminance signal and chrominance signal are present in the bitstream.

17. The non-transitory computer readable medium of claim 14, further comprising:

generating a reconstructed block using intra prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block.

18. The non-transitory computer readable medium of claim 17, wherein

a size of the prediction block and the size of the first transform block are different.

19. The non-transitory computer readable medium of claim 14, further comprising:

generating a reconstructed block using inter prediction for a prediction block in the coding unit and a reconstructed residual block for the first transform block, wherein

the intra prediction for the prediction block is performed using a merge mode or an advanced motion vector prediction mode.