VIDEO ENCODING DEVICE AND VIDEO DECODING DEVICE USING HIGH-PRECISION SKIP ENCODING AND METHOD THEREOF

• US 20170339425A1
• Filed: 11/02/2015
• Published: 11/23/2017
• Est. Priority Date: 10/31/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: JEONG, Seung-soo, PARK, Min-woo, LEE, Jin-young, LEE, Sun-il
• Granted Patent: US 10,602,179 B2
• Time in Patent Office: Days
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/52 by predictive encoding

Abstract

Provided is a video decoding method performed by a video decoding apparatus, the video decoding method including: determining prediction mode information of a current block and an index indicating a prediction candidate, from a bitstream; determining a prediction candidate list according to the prediction mode information; when the prediction mode information of the current block indicates a pre-set prediction mode, determining a motion vector indicated by the index indicating the prediction candidate from the prediction candidate list, and determining a prediction motion vector of the current block based on at least one of pieces of motion prediction information related to the motion vector; and determining a motion vector of the current block based on the prediction motion vector, wherein the pre-set prediction mode is a prediction mode different from a skip mode and a merge mode.

Claims

1. A video decoding method performed by a video decoding apparatus, the video decoding method comprising:

determining prediction mode information of a current block and an index indicating a prediction candidate, from a bitstream;

determining a prediction candidate list according to the prediction mode information;

when the prediction mode information of the current block indicates a pre-set prediction mode, determining a motion vector indicated by the index indicating the prediction candidate from the prediction candidate list, and determining a prediction motion vector of the current block based on at least one of pieces of motion prediction information related to the motion vector; and

determining a motion vector of the current block based on the prediction motion vector,

wherein the pre-set prediction mode is a prediction mode different from a skip mode and a merge mode.

2. The video decoding method of claim 1, wherein the prediction candidate list according to the pre-set prediction mode comprises motion vectors of candidates at uniform distances from a basic motion vector.

3. The video decoding method of claim 2, wherein the basic motion vector is one of prediction motion vector candidates used in a skip mode or a merge mode of the current block.

4. The video decoding method of claim 2, wherein the determining of the prediction candidate list comprises determining, as a first candidate group, prediction motion vector candidates at a first pixel distance from the basic motion vector, and determining, as a second candidate group, prediction motion vector candidates at a second pixel distance from the basic motion vector.

5. The video decoding method of claim 1, wherein the motion prediction information related to the motion vector comprises at least one of a reference direction obtained from a neighboring block of the current block, an index of a reference picture, a value of the motion vector, and motion vector difference information, and

the determining of the prediction motion vector of the current block comprises determining the prediction motion vector of the current block by combining or changing the reference direction, the index of the reference picture, the value of the motion vector, and the motion vector difference information.

6. The video decoding method of claim 1, wherein indexes indicated by prediction motion vector candidates included in the prediction candidate list comprise indexes indicating prediction motion vector candidates according to the skip mode or the merge mode and indexes indicating prediction motion vector candidates according to the pre-set prediction mode,

wherein the indexes indicating the prediction motion vector candidates according to the pre-set prediction mode are generated between existing indexes.

7. The video decoding method of claim 1, wherein the prediction mode information of the pre-set prediction mode is obtained between a skip flag and a merge mode flag or obtained after the skip flag and the merge mode flag.

8. A video encoding method performed by a video encoding apparatus, the video encoding method comprising:

determining a prediction candidate list according to a pre-set prediction mode;

when prediction mode information of a current block indicates the pre-set prediction mode, determining a motion vector indicated by an index from the prediction candidate list, and determining a prediction motion vector of the current block based on at least one of pieces of motion vector information related to the motion vector;

determining a motion vector of the current block based on the prediction motion vector; and

encoding prediction mode information indicating the pre-set prediction mode,

wherein the pre-set prediction mode is a prediction mode different from a skip mode and a merge mode.

9. The video encoding method of claim 8, wherein the prediction candidate list according to the pre-set prediction mode comprises, as prediction motion vector candidates, candidates at uniform distances from a basic motion vector.

10. The video encoding method of claim 9, wherein the basic motion vector is one of prediction motion vector candidates used in a skip mode or a merge mode of the current block.

11. The video encoding method of claim 9, wherein the determining of the prediction candidate list comprises determining, as a first candidate group, prediction motion vector candidates at a first pixel distance from the basic motion vector, and determining, as a second candidate group, prediction motion vector candidates at a second pixel distance from the basic motion vector.

12. The video encoding method of claim 8, wherein indexes indicated by prediction motion vector candidates included in the prediction candidate list comprises indexes indicating prediction motion vector candidates according to the skip mode or the merge mode and indexes indicating prediction motion vector candidates according to the pre-set prediction mode,

wherein the indexes indicating the prediction motion vector candidates according to the pre-set prediction mode are generated between existing indexes.

13. The video encoding method of claim 8, wherein the prediction mode information of the pre-set prediction mode is obtained between a skip flag and a merge mode flag or obtained after the skip flag and the merge mode flag.

14. A video decoding apparatus comprising:

a determiner configured to determine prediction mode information of a current block and an index indicating a prediction candidate, from a bitstream, and determine a prediction candidate list according to the prediction mode information; and

a decoder configured to, when the prediction mode information of the current block indicates a pre-set prediction mode, determine a motion vector indicated by the index from the prediction candidate list, determine a prediction motion vector of the current block based on at least one of pieces of motion prediction information related to the motion vector, and perform motion compensation on the current block based on a motion vector of the current block obtained from the prediction motion vector,

wherein the pre-set prediction mode is a prediction mode different from a skip mode and a merge mode.

15. (canceled)