DECODING METHOD AND APPARATUS FOR BLOCK-BASED DIGITALLY ENCODED PICTURE
First Claim
1. A decoding method for block-based digitally encoded pictures, comprising:
- reconstructing a zeroth reference picture list and a first reference picture list for a current picture according to a digital picture encoding protocol, the current picture comprising a direct mode bi-predictive block, and the zeroth reference picture list and the first reference picture list storing access information for decoded pictures during decoding the current picture;
obtaining access information for the co-located picture of the current picture through the first reference picture list, the co-located picture comprising a co-located block of the direct mode bi-predictive block, and the co-located block having the same coordinate as that of the direct mode bi-predictive block;
obtaining a predetermined index through the access information for the co-located picture, and acquiring the access information of a predetermined reference picture of the co-located block through the predetermined index;
determining a reference index by searching the zeroth reference picture list, the reference index being an index of an entry storing the access information of the predetermined reference picture in the zeroth reference picture list;
saving the reference index into an index field of an entry indexed by the predetermined index in a first data structure; and
determining a derived motion vector of the direct mode bi-predictive block according to a time sequence characteristic value of the current picture, the time sequence characteristic value of the co-located picture, the time sequence characteristic value of the predetermined reference picture and a predetermined motion vector of the co-located block with respect to the predetermined reference picture.
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Abstract
A decoding method for block-based digital encoded picture is disclosed. The method including the steps of reconstructing a zeroth reference picture list and a first reference picture list for a current picture based on a predetermined digital picture coding protocol; establishing a lookup table which includes a parameter field for storing a distance scalar, the distance scalar being derived from the time sequence characteristic values of the current picture, the co-located picture and a predetermined reference picture; determining a derived motion vector of a direct mode bi-predictive block according to the distance scalar and a predetermined motion vector of a co-located block with respect to the predetermined reference picture. An apparatus for implementing the method is also disclosed.
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Citations
20 Claims
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1. A decoding method for block-based digitally encoded pictures, comprising:
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reconstructing a zeroth reference picture list and a first reference picture list for a current picture according to a digital picture encoding protocol, the current picture comprising a direct mode bi-predictive block, and the zeroth reference picture list and the first reference picture list storing access information for decoded pictures during decoding the current picture; obtaining access information for the co-located picture of the current picture through the first reference picture list, the co-located picture comprising a co-located block of the direct mode bi-predictive block, and the co-located block having the same coordinate as that of the direct mode bi-predictive block; obtaining a predetermined index through the access information for the co-located picture, and acquiring the access information of a predetermined reference picture of the co-located block through the predetermined index; determining a reference index by searching the zeroth reference picture list, the reference index being an index of an entry storing the access information of the predetermined reference picture in the zeroth reference picture list; saving the reference index into an index field of an entry indexed by the predetermined index in a first data structure; and determining a derived motion vector of the direct mode bi-predictive block according to a time sequence characteristic value of the current picture, the time sequence characteristic value of the co-located picture, the time sequence characteristic value of the predetermined reference picture and a predetermined motion vector of the co-located block with respect to the predetermined reference picture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A decoding method for block-based digitally encoded pictures, comprising:
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reconstructing a zeroth reference picture list and a first reference picture list for a current picture according to a digital picture encoding protocol, the current picture comprising a direct mode bi-predictive block, and the zeroth reference picture list and the first reference picture list storing access information for decoded pictures during decoding the current picture; establishing a look up table which comprises an entry containing a parameter field for storing a distance scalar, the distance scalar being derived from a time sequence characteristic value of the current picture, the time sequence characteristic value of a co-located picture and the time sequence characteristic value of a predetermined reference picture of a co-located block; determining a derived motion vector of the direct mode bi-predictive block according to the parameter field and a predetermined motion vector of the co-located block with respect to the predetermined reference picture, wherein the access information of the co-located picture is in the first reference picture list, and the co-located block is a block in the co-located picture and has the same coordinate with the direct mode bi-predictive block. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A decoding apparatus for block-based digitally encoded pictures, comprising:
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a reference picture list reconstruction unit, configured for reconstructing a zeroth reference picture list and a first reference picture list for a current picture according to a digital picture encoding protocol, the current picture comprising a direct mode bi-predictive block, and the zeroth reference picture list and the first reference picture list storing access information for decoded pictures during decoding the current picture; a lookup table construction unit, configured for establishing a lookup table which comprises an entry containing an index field for storing a reference index associated with the zeroth reference picture list; and a motion vector deriving unit, configured for acquiring an access information of a predetermined reference picture of a co-located block, and determining a derived motion vector of the direct mode bi-predictive block according to a time sequence characteristic value of the co-located picture containing the co-located block, the time sequence characteristic value of the predetermined reference picture and a predetermined motion vector of the co-located block with respect to the predetermined reference picture, wherein the access information of the co-located picture is in the first reference picture list, and the co-located block has the same coordinate with the direct mode bi-predictive block in the co-located picture. - View Dependent Claims (17, 18, 19, 20)
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Specification