Method for inducing prediction motion vector and apparatuses using same

Patent metadata

Field	Value
Publication number	US-10708615-B2
Application number	US-201816214805-A
Country	US
Kind code	B2
Filing date	Dec 10, 2018
Priority date	Sep 16, 2011
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

Disclosed are a method for inducing a prediction motion vector and an apparatus using the same. An image decoding method can include: a step of determining the information related to a plurality of spatial candidate prediction motion vectors from peripheral predicted blocks of a predicted target block; and a step of determining the information related to temporal candidate prediction motion vectors on the basis of the information related to the plurality of spatial candidate prediction motion vectors. Accordingly, the present invention can reduce complexity and can enhance coding efficiency when inducing the optimum prediction motion vector.

First claim

The invention claimed is:

1. A video decoding apparatus comprising:
an entropy decoding unit to decode prediction mode information indicating a prediction mode of a prediction target block, and decode information on a prediction motion vector used to perform inter prediction on the prediction target block among candidate prediction motion vectors comprised in a candidate prediction motion vector list in accordance with the prediction mode; and
a prediction unit to generate the candidate prediction motion vector list by determining information on a plurality of spatial candidate prediction motion vectors from a neighboring prediction block to the prediction target block and determining information on a temporal candidate prediction motion vector based on the information on the plurality of spatial candidate prediction motion vectors,
wherein the information on the plurality of spatial candidate prediction motion vectors comprises at least one of first spatial candidate prediction motion vector availability information and a first spatial candidate prediction motion vector and at least one of second spatial candidate prediction motion vector availability information and a second spatial candidate prediction motion vector, and the information on the temporal candidate prediction motion vector comprises at least one of temporal candidate prediction motion vector availability information and the temporal candidate prediction motion vector,
wherein when both the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are available and the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are different from each other, the prediction unit determines the temporal candidate prediction motion vector availability information such that the temporal candidate prediction motion vector is unavailable.

2. The video decoding apparatus of claim 1 , wherein when at least one of the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector is unavailable or when both the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are available and the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are the same as each other, the prediction unit determines the information on the temporal candidate prediction motion vector by performing a process of deriving the information on the temporal candidate prediction motion vector.

3. The video decoding apparatus of claim 1 , wherein the prediction unit reconfigures the candidate prediction motion vector list by determining whether the number of candidate prediction motion vectors comprised in the candidate prediction motion vector list is smaller than a maximum number of candidate prediction motion vectors to be comprised in the candidate prediction motion vector list and adding a candidate prediction motion vector based on a determination result.

4. The video decoding apparatus of claim 3 , wherein the prediction unit adds a zero vector to the candidate prediction motion vector list when the number of candidate prediction motion vectors comprised in the candidate prediction motion vector list is smaller than the maximum number of candidate prediction motion vectors.

5. A video encoding apparatus comprising:
a prediction unit to generate a candidate prediction motion vector list by determining information on a plurality of spatial candidate prediction motion vectors from a neighboring prediction block to a prediction target block and determining information on a temporal candidate prediction motion vector based on the information on the plurality of spatial candidate prediction motion vectors; and
an entropy encoding unit to encode prediction mode information indicating a prediction mode of the prediction target block, and encode information on a prediction motion vector used to perform inter prediction on the prediction target block among candidate prediction motion vectors comprised in the candidate prediction motion vector list in accordance with the prediction mode,
wherein the information on the plurality of spatial candidate prediction motion vectors comprises at least one of first spatial candidate prediction motion vector availability information and a first spatial candidate prediction motion vector and at least one of second spatial candidate prediction motion vector availability information and a second spatial candidate prediction motion vector, and the information on the temporal candidate prediction motion vector comprises at least one of temporal candidate prediction motion vector availability information and the temporal candidate prediction motion vector,
wherein when both the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are available and the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are different from each other, the prediction unit determines the temporal candidate prediction motion vector availability information such that the temporal candidate prediction motion vector is unavailable.

6. The video encoding apparatus of claim 5 , wherein when at least one of the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector is unavailable or when both the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are available and the first spatial candidate prediction motion vector and the second spatial candidate prediction motion vector are the same as each other, the prediction unit determines the information on the temporal candidate prediction motion vector by performing a process of deriving the information on the temporal candidate prediction motion vector.

7. The video encoding apparatus of claim 5 , wherein the prediction unit reconfigures the candidate prediction motion vector list by determining whether the number of candidate prediction motion vectors comprised in the candidate prediction motion vector list is smaller than a maximum number of candidate prediction motion vectors to be comprised in the candidate prediction motion vector list and adding a candidate prediction motion vector based on a determination result.

8. The video encoding apparatus of claim 7 , wherein the prediction unit adds a zero vector to the candidate prediction motion vector list when the number of candidate prediction motion vectors comprised in the candidate prediction motion vector list is smaller than the maximum number of candidate prediction motion vectors.

9. A non-transitory computer-readable medium storing a bitstream generated by the video encoding method of claim 5 .

10. A non-transitory computer-readable medium storing a bitstream, the bitstream comprising:
prediction mode information indicating a prediction mode of a prediction target block; and
information on a prediction motion vector used to perform inter prediction on the prediction target block among candidate prediction motion vectors comprised in a candidate prediction motion vector list;
wherein the candidate prediction motion vector list is generated by determining information on a plurality of spatial candidate prediction motion vectors from a neighboring prediction block to the prediction target block and determining information on a temporal candidate prediction motion vector based on the information on the plurality of spatial candidate prediction motion vectors,
wherein the information on the plurality of spatial candidate prediction motion vecto

Assignees

• Electronics & Telecommunications Res Inst
• Iucf Korea Aerospace Univ

Inventors

• Lim Sung Chang
• Kim Hui Yong
• Lee Jin Ho
• Choi Jin Soo
• Kim Jin Woong
• Kim Jae Gon
• Lee Sang Yong
• Park Un Ki

Classifications

• H04N19/56 Primary

  Motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate a search · CPC title

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/105

  Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction · CPC title

• H04N19/176

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

• H04N19/52 Primary

  by predictive encoding · CPC title