Abstract:
An image coding method includes: deriving a candidate for a motion vector predictor from a neighboring motion vector (S1201); adding the candidate to a list (S1202); selecting a motion vector predictor from the list; coding a current block (S1203); and coding a current motion vector (S1204). In the deriving (S1201), the candidate is derived according to a first derivation scheme when each of a current reference picture and a neighboring reference picture is determined to be a long-term reference picture, and the candidate is derived according to a second derivation scheme when each of a current reference picture and a neighboring reference picture is determined to be a short-term reference picture.
Abstract:
An image encoding method according to an aspect of the present invention includes: generating, from a plurality of first sub-bitstreams which are obtained by encoding a plurality of images on a per layer basis according to spatial scalable image encoding, a second sub-bitstream including two or more first sub-bitstreams corresponding to two or more layers, the two or more first sub-bitstreams being included in the plurality of first sub-bitstreams; and generating a descriptor including a first field indicating a minimum value for two or more layer identifiers indicating the two or more layers and a second field indicating a maximum value for the two or more layer identifiers.
Abstract:
A moving picture coding method for calculating a motion vector predictor to be used when coding a motion vector of a current block, and coding the current block includes: (S102) obtaining motion vector predictor candidates a fixed number of which is two or more; (S103) selecting the motion vector predictor to be used for coding the motion vector of the current block, from among the motion vector predictor candidates the fixed number of which is two or more; and (S104) coding an index for identifying the selected motion vector predictor according to the fixed number of two or more, wherein the motion vector predictor candidates the fixed number of which is two or more include one or more candidates each having a predetermined second fixed value.
Abstract:
The image decoding method includes: determining a context for use in a current block, from among a plurality of contexts (S204); and performing arithmetic decoding on a bit sequence corresponding to the current block, using the determined context (S210), wherein in the determining (S204): the context is determined under a condition that control parameters of neighboring blocks of the current block are used, when the signal type is a first type, the neighboring blocks being a left block and an upper block of the current block (S206); and the context is determined under a condition that the control parameter of the upper block is not used, when the signal type is a second type (S207), and the second type is one of "mvd_I0" and "mvd_I1".
Abstract:
An image coding method bitstream includes: determining a maximum number of a merging candidate which is a combination of a prediction direction, a motion vector, and a reference picture index for use in coding of a current block (S201); deriving a first merging candidate (S202); determining whether or not a total number of the first merging candidate is smaller than the maximum number (S204); deriving a second merging candidate when it is determined that the total number of the first merging candidate is smaller than the maximum number (S205); selecting a merging candidate for use in the coding of the current block from the first merging candidate and the second merging candidate (S206); and coding, using the maximum number, an index for identifying the selected merging candidate, and attaching the coded index to the bitstream (S207).
Abstract:
A video encoding method using a plurality of reference pictures includes: selecting (300) whether or not a resilient picture referencing scheme is to be used for encoding video; writing (302) a parameter indicating the selection into a header of an encoded video bitstream; and encoding (304) a picture using inter-picture prediction using a result of the selection.
Abstract:
An image coding method according to the present invention partitions an input image signal (120) into processing units, and codes the partitioned image to generate a code sequence (140), the image coding method including: determining a partitioning pattern for hierarchically partitioning the input image signal (120) in order starting from a largest unit of the processing units; generating partition information (131) indicative of the partitioning pattern; and coding partition information (131), wherein the partition information (131) includes maximum used hierarchy depth information (used_max_depth) indicative of a maximum used hierarchy depth which is a hierarchy depth of a deepest processing unit of the processing units included in the partitioning pattern.