Abstract:
An image coding method includes: deriving a candidate for a motion vector of a current block from a co-located motion vector (S1301); adding the candidate to a list (S1302); selecting the motion vector of the current block from the list (S1303); and coding the current block (S1304), wherein the deriving (S1301) includes: deriving the candidate by a first derivation scheme in the case of determining that each of a current reference picture and a co-located reference picture is a long-term reference picture; and deriving the candidate by a second derivation scheme in the case of determining that each of the current reference picture and the co-located reference picture is a short-term reference picture.
Abstract:
An image coding method includes: selecting a first picture from plural pictures (S141); setting a first temporal motion vector prediction flag which is associated with the first picture and is a temporal motion vector prediction flag indicating whether or not temporal motion vector prediction is to be used, to indicate that the temporal motion vector prediction is not to be used, and coding the first temporal motion vector prediction flag (S142); coding the first picture without using the temporal motion vector prediction (S143); and coding a second picture which follows the first picture in coding order, with referring to a motion vector of a picture preceding the first picture in coding order being prohibited (S144).
Abstract:
The image coding method can improve coding efficiency by using an adaptive bit-depth. The image coding method is used to code images to generate a coded stream. The image coding method includes: writing (S1001), into a sequence parameter set in the coded stream to be generated, a first parameter representing a first bit-depth that is a bit-depth of a reconstructed sample in the images; and writing (S1002), into the sequence parameter set, a second parameter which is different from the first parameter and represents a second bit-depth that is a bit-depth of an Intra Pulse Code Modulation (IPCM) sample in the images.
Abstract:
State-of-the-art video coding schemes supports splitting a picture into smaller rectangular units called tiles units. Each tile units can be independently encoded and decoded by separate encoders and decoders, respectively. The primary purpose of tiles units is to allow parallel processing of the picture to reduce implementation cost and complexity. The present disclosure provides additional functionality to define flexible partitioned tile regions and to allow partial decoding and reconstruction of tile regions.
Abstract:
A method of encoding a video into a coded video bitstream with temporal motion vector prediction comprises: determining a value of a flag for indicating whether temporal motion vector prediction is used or not used for the inter-picture prediction of a sub-picture unit of a picture; and writing the flag having the value into a header of the sub-picture unit or a header of the picture; wherein if the flag indicates that temporal motion vector prediction is used, the method further comprises: creating a first list of motion vector predictors comprising a plurality of motion vector predictors including at least one temporal motion vector predictor derived from at least one motion vector from a collocated reference picture; selecting a motion vector predictor out of the first list; and writing a first parameter into the coded video bitstream for indicating the selected motion vector predictor out of the first list.
Title translation:BILDCODIERUNGSVERFAHREN,BILDDECODIERUNGSVERFAHREN,BILDCODIERUNGSVORRICHTUNG,BILDDECODIERUNGSVORRICHTUNG UND BILDCODIERUNGS - / - DECODIERUNGSVORRICHTUNG
Abstract:
An image coding method includes: deriving a candidate for a motion vector predictor from a co-located motion vector (S1301); adding the candidate to a list (S1302); selecting the motion vector predictor from the list (S1303); and coding a current block and coding a current motion vector (S1304), wherein the deriving (S1301) includes: deriving the candidate by a first derivation scheme in the case of determining that each of a current reference picture and a co-located reference picture is a long-term reference picture; and deriving the candidate by a second derivation scheme in the case of determining that each of the current reference picture and the co-located reference picture is a short-term reference picture.
Abstract:
An image coding method according to an aspect of the present invention includes: writing, into a sequence parameter set, buffer description defining information for defining a plurality of buffer descriptions (S102); writing, into the sequence parameter set, reference list description defining information for defining a plurality of reference list descriptions corresponding to the buffer descriptions (S103); and writing, into a first header of each processing unit which is included in a coded bitstream, buffer description selecting information for specifying a selected buffer description (S105).