CA2451568A1 - Motion vector calculation method - Google Patents

Motion vector calculation method Download PDF

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Publication number
CA2451568A1
CA2451568A1 CA002451568A CA2451568A CA2451568A1 CA 2451568 A1 CA2451568 A1 CA 2451568A1 CA 002451568 A CA002451568 A CA 002451568A CA 2451568 A CA2451568 A CA 2451568A CA 2451568 A1 CA2451568 A1 CA 2451568A1
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motion vector
picture
motion
block
calculation method
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CA002451568A
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CA2451568C (en
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Satoshi Kondo
Shinya Kadono
Makoto Hagai
Kiyofumi Abe
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Panasonic Intellectual Property Corp of America
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    • H04N19/51—Motion estimation or motion compensation
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Abstract

When a block (MB22) referred to by a motion vector has a plurality of motion vectors in a direct mode, a scaling is performed on a value obtained by selecting an average or one of the plurality of motion vectors to thereby determine two motion vectors (MV23) and (MV24) used for the picture-to-pictu re prediction of a picture (P23) to be encoded.

Claims (19)

1. A motion vector calculation method for inter picture prediction with reference to a plurality of pictures, the motion vector calculation method comprising:
a referring step for referring to a plurality of pictures preceding in display order or a plurality of pictures following in display order or a plurality of pictures both preceding and following in display order; and a motion compensating step for calculating a motion vector of a inter picture predictive block using at least one motion vector, which satisfies a predetermined condition, among motion vectors already calculated for a co-located block of which motion vector is referred to, when performing motion compensation of the inter picture predictive block with reference to a motion vector of the co-located block in a picture other than a picture to which the inter picture predictive block belongs.
2. The motion vector calculation method according to Claim 1, wherein in the reference step, each one of pictures selected from a first picture order and a second picture order can be referred to, the first picture order being the order in which identifying numbers are assigned to pictures in ascending sequence giving priority to a picture precedent in display order, and the second picture order being the order in which identifying numbers are assigned to pictures in ascending sequence giving priority to a picture following in display order, in the motion compensating step, a motion vector, which refers to a picture in the first picture order, of the block of which motion vector is referred to is used.
3. The motion vector calculation method according to Claim 2, wherein in the motion compensating step, the other picture is a picture having the smallest identifying number of the pictures in the second picture order, and a motion vector of the inter picture predictive block is calculated using the motion vector of the co-located block.
4. The motion vector calculation method according to Claim 2, wherein in the motion compensating step, when the block of which motion vector is referred to contains a plurality of motion vectors referring to a picture stored in a long term picture buffer, a motion vector referring to a picture in the first picture order is used as a motion vector of the inter picture predictive block among motion vectors referring to the picture stored in the long term picture buffer.
5. The motion vector calculation method according to Claim 1, wherein in the motion compensating step, the motion vector of the inter picture predictive block is calculated using at least one of motion vectors referring to the picture preceding in display order.
6. The motion vector calculation method according to Claim 1, wherein in the motion compensating step, when the block of which motion vector is referred to contains one or more motion vectors, the motion vector of the inter picture predictive block is calculated using a motion vector coded or decoded previously, or a motion vector previously described in a bit stream.
7. The motion vector calculation method according to Claim 1, wherein in the motion compensating step, when the block of which motion vector is referred to contains a plurality of motion vectors referring to one of the pictures preceding or following in display order, a motion vector of the inter picture predictive block is calculated using at least one of the plurality of motion vectors.
8. The motion vector calculation method according to Claim 1, wherein in the motion compensating step, when the block of which motion vector is referred to contains a plurality of motion vectors referring to one of the pictures preceding and following in display order, a motion vector for performing motion compensation is calculated using one motion vector referring to a picture close to an inter picture predictive picture in display order or one motion vector referring to a picture far in display order among the plurality of motion vectors.
9. The motion vector calculation method according to one of Claim 1 ~ Claim 8, wherein in the motion compensating step, when the block of which motion vector is referred to contains one motion vector stored in the long term picture buffer, as the motion vector of the inter picture predictive block, the motion vector stored in the long term picture buffer is assigned.
10. The motion vector calculation method according to one of Claim 1 N Claim 8, wherein in the motion compensating step, when the block of which motion vector is referred to contains at least one motion vector referring to a picture stored in the long term picture buffer, and when the motion vector referring to the picture stored in the long term picture buffer is a motion vector which refers to a picture preceding a picture containing the block of which motion vector is referred to in display order, the motion vector is determined as the motion vector of the inter picture predictive block.
11. The motion vector calculation method according to one of Claim 1 ~ Claim 8, wherein in the motion compensating step, an operation rounding to a predetermined precision of a motion vector is further performed in process of calculating the motion vector of the inter picture predictive block or for the last result.
12. A motion vector calculation method for the case that inter picture prediction is performed using a plurality of pictures, the motion vector calculation method comprising:
an assigning step for assigning one of a first reference index or a second reference index to the coded picture, the first reference index and the second reference index being used for selecting at least one of a first reference picture or a second reference picture which are referred to when obtaining a block in a target picture to be coded by motion compensation from a plurality of coded pictures stored in a storing unit;
a first selecting step, when performing motion compensation of a block in the target picture to be coded, there are a plurality of motion vectors containing the first reference indices among motion vectors of blocks in the neighbor of the target picture to be coded, for selecting a motion vector indicating a median value of the motion vectors; and a detecting step for detecting a motion vector referring to a picture preceding the target picture to be coded in display order or a picture following the target picture to be coded in display order or pictures preceding and following the target picture to be coded in display order using the motion vector selected in the first selecting step.
13. The motion vector calculation method according to Claim 12, wherein in the first selecting step, a motion vector indicating a median value of the smallest first reference indices is further selected from motion vectors containing the first reference indices.
14. The motion vector calculation method according to Claim 13, wherein the first selecting step further comprises a second selecting step, when in the motion vectors of the blocks in the neighbor of the target picture to be coded there are a plurality of motion vectors containing the second reference indices, for selecting a motion vector indicating a median value of the motion vectors.
15. The motion vector calculation method according to Claim 14, wherein in the second selecting step, a motion vector indicating a median value of the smallest second reference indices is further selected from the motion vectors containing the second reference indices.
16. The motion vector calculation method according to Claim 15, wherein in the detecting step, a motion vector selected in the first selecting step is assumed to be a motion vector of the case that the block in the target picture to be coded refers to a picture preceding the target picture to be coded in display order, and a motion vector selected in the second selecting step is assumed to be a motion vector of the case that the block in the target picture to be coded refers to a picture following the target picture to be coded in display order.
17. The motion vector calculation method according to Claim 15, wherein in the detecting step, a motion vector selected in the first selecting step is assumed to be a motion vector of the case that the block in the target picture to be coded refers to the first reference picture, and a motion vector selected in the second selecting step is assumed to be a motion vector of the case that the block in the target picture to be coded refers to the second reference picture.
18. The motion vector calculation method according to Claim 12, wherein when the neighbouring block is a block in the direct mode which performs coding using a motion vector of other block, a motion vector used virtually for coding or decoding the other block is assumed to be a motion vector of the block in the direct mode.
19. The motion vector calculation method according to Claim 12 comprising instead of the first selecting step:
a judging step, when motion compensation of the block in the target picture to be coded is performed, for determining a motion vector calculation method in concordance with the number of motion vectors containing the smallest first reference indices of motion vectors of the blocks in the neighbor of the blocks in the target picture to be coded, wherein in the detecting step, instead of the selected motion vector, a motion vector referring to a picture preceding the target picture to be coded in display order or a picture following the target picture to be coded in display order or pictures preceding and following the target picture to be coded in display order is derived by using a determined motion vector detecting method.
CA2451568A 2002-04-19 2003-04-16 Motion vector calculation method Expired - Lifetime CA2451568C (en)

Applications Claiming Priority (23)

Application Number Priority Date Filing Date Title
JP2002118598 2002-04-19
JP2002-118598 2002-04-19
JP2002121053 2002-04-23
JP2002-121053 2002-04-23
US37864302P 2002-05-09 2002-05-09
US60/378,643 2002-05-09
US37895402P 2002-05-10 2002-05-10
US60/378,954 2002-05-10
JP2002-156266 2002-05-29
JP2002156266 2002-05-29
JP2002177889 2002-06-19
JP2002-177889 2002-06-19
JP2002193027 2002-07-02
JP2002-193027 2002-07-02
JP2002-204713 2002-07-12
JP2002204713 2002-07-12
JP2002-262151 2002-09-06
JP2002262151 2002-09-06
JP2002290542 2002-10-02
JP2002-290542 2002-10-02
JP2002323096 2002-11-06
JP2002-323096 2002-11-06
PCT/JP2003/004805 WO2003090473A1 (en) 2002-04-19 2003-04-16 Motion vector calculating method

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CA2451568C CA2451568C (en) 2012-08-21

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