Motion vector calculation method

Patent metadata

Field	Value
Publication number	US-9264730-B2
Application number	US-201514602696-A
Country	US
Kind code	B2
Filing date	Jan 22, 2015
Priority date	Apr 19, 2002
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

When a block (MB 22 ) of which motion vector is referred to in the direct mode contains a plurality of motion vectors, 2 motion vectors MV 23 and MV 24 , which are used for inter picture prediction of a current picture (P 23 ) to be coded, are determined by scaling a value obtained from averaging the plurality of motion vectors or selecting one of the plurality of the motion vectors.

First claim

The invention claimed is:

1. A picture coding method for coding a current block included in a current picture in direct mode, the picture coding method comprising:
specifying a co-located block which is a block included in a second picture that is different from the current picture, the co-located block being located in the second picture at the same position that the current block is located in the current picture;
determining a first motion vector and a second motion vector of the current block for performing motion compensation on the current block, using a third motion vector which is a motion vector of the co-located block;
generating a first predictive image of the current block using the first motion vector of the current block and a second predictive image of the current block using the second motion vector of the current block;
generating a predictive image of the current block based on the first predictive image and the second predictive image;
generating a difference image of the current block between the current block and the predictive image of the current block; and
coding the difference image of the current block to obtain coded data of the current block,
wherein, the co-located block is motion-compensated using a first motion vector corresponding to a first reference picture of the co-located block and a second motion vector corresponding to a second reference picture of the co-located block, and
wherein, in the case where the first and second reference pictures of the co-located block are both stored in a long-term picture buffer, (i) the third motion vector is determined to be equal to one of the first and second motion vectors of the co-located block, and (ii) the first motion vector of the current block is determined to be equal to the third motion vector, and (iii) the second motion vector of the current block is determined to be a value of 0.

2. The picture coding method according to claim 1 ,
wherein said one of the first and second motion vectors of the co-located block is a motion vector which refers to a reference picture selected from a reference picture list in which lower identification numbers are assigned with priority to a reference picture located prior to the current picture in display order.

3. A picture coding apparatus for coding a current block included in a current picture in direct mode, the picture coding apparatus comprising:
a specifying unit operable to specify a co-located block which is a block included in a second picture that is different from the current picture, the co-located block being located in the second picture at the same position that the current block is located in the current picture;
a motion vector determining unit operable to determine a first motion vector and a second motion vector of the current block for performing motion compensation on the current block, using a third motion vector which is a motion vector of the co-located block;
a first and second predictive image generating unit operable to generate a first predictive image of the current block using the first motion vector of the current block and a second predictive image of the current block using the second motion vector of the current block;
a predictive image generating unit operable to generate a predictive image of the current block based on the first predictive image and the second predictive image;
a difference image generating unit operable to generate a difference image between the current block and the predictive image of the current block; and
a difference image coding unit operable to code the difference image to obtain coded data of the current block,
wherein, the co-located block is motion-compensated using a first motion vector corresponding to a first reference picture of the co-located block and a second motion vector corresponding to a second reference picture of the co-located block, and
wherein, in the case where the first and second reference pictures of the co-located block are both stored in a long-term picture buffer, (i) the third motion vector is determined to be equal to one of the first and second motion vectors of the co-located block, and (ii) the first motion vector of the current block is determined to be equal to the third motion vector, and (iii) the second motion vector of the current block is determined to equal to be a value of 0.

4. The picture coding apparatus according to claim 3 ,
wherein said one of the first and second motion vectors of the co-located block is a motion vector which refers to a reference picture selected from a reference picture list in which lower identification numbers are assigned with priority to a reference picture located prior to the current picture in display order.

Assignees

• Panasonic Ip Corp America

Inventors

• Kondo Satoshi
• Kadono Shinya
• Hagai Makoto
• Abe Kiyofumi

Classifications

• H04N19/52 Primary

  by predictive encoding · CPC title

• H04N19/51

  Motion estimation or motion compensation · CPC title

• H04N19/136

  Incoming video signal characteristics or properties · CPC title

• H04N19/30

  using hierarchical techniques, e.g. scalability (H04N19/63 takes precedence) · CPC title

• H04N19/513 Primary

  Processing of motion vectors · CPC title