Sun Patent Trust

Panasonic Intellectual Property Corporation of America

Panasonic Corporation

Tagivan Ii LLC

Velos Media, LLC

Panasonic Intellectual Property Management Co., Ltd.

Sovereign Peak Ventures, LLC

Velos Media International Limited

Hisao Sasai

Youji Shibahara

Takahiro Nishi

Toshiyasu Sugio

Kyoko Tanikawa

Toru Matsunobu

Kengo Terada

Chong Soon Lim

Viktor Wahadaniah

Sue Mon Thet Naing

Hai Wei Sun

Satoshi Yoshikawa

Tadamasa Toma

Daisaku Komiya

Satoshi Kondo

Kyaw Kyaw Win

Xuan Jing

Virginie Drugeon

Sue Mon Naing

Takeshi Tanaka

Matthias Narroschke

Shinya Kadono Kadono

Thomas Wedi

Jin Li

Noritaka Iguchi

Masayasu Iguchi

Steffen Wittmann

Torsten Palfner

Yui Koashi

Kyoto Tanikawa

Haiwei Sun

Mikihiro Ouchi

Tao Chen

Sheng Mei Shen

Naoto Yumiki

Yoshiichiro Kashiwagi

Pongsak Lasang

Tomokazu Ishikawa

Takako Hori

Yoshinori Matsui

Masayuki Toyama

Aki Yoneda

Yuki Maruyama

Fumio Muramatsu

Tomoaki Itoh

Yoichi Sugino

Martin Schlockermann

Kuniaki Isogai

Yukinaga Seki

Ryuji Muta

Vikto Wahadaniah

Youji Sibahara

Yi Zhao

Toru Matsunobo

Sugio Toshiyasu,

Victor Wahadaniah

A current block included in a current picture included in a coded video stream is decoded by determining a reference picture in the coded video stream, the reference picture being included in one of (i) a first reference picture group of the current block and (ii) a second reference picture group of the current block; selecting a reference motion vector of a reference block in the reference picture such that in situation (A) when the reference block has a first reference motion vector and a second reference motion vector that respectively correspond to the first reference picture group and the second reference picture group, (i) the first reference motion vector is selected when the reference picture is included in the second reference picture group and (ii) the second reference motion vector is selected when the reference picture is included in the first reference picture group, in situation (B) when the reference block has only one reference motion vector, the only reference motion vector is selected, and in situation (C) when the reference block has no reference motion vector, a zero reference motion vector is selected; deriving the motion vector of the current block using the selected one reference motion vector; and decoding the current block using the derived motion vector.

Motion vector calculation method, picture coding method, picture decoding method, motion vector calculation apparatus, and picture coding and decoding apparatus

An image coding method of hierarchically coding a plurality of pictures to generate a bitstream, includes: coding each of the plurality of pictures, which belongs to any one of a plurality of hierarchical layers, with reference to a picture belonging to a hierarchical layer which is same as or lower than a hierarchical layer to which the picture belongs, and without reference to a picture belonging to a hierarchical layer which is higher than the hierarchical layer to which the picture belongs; and generating the bitstream by coding the coded pictures and time information indicating decoding times of the coded pictures. The time information indicates that the decoding times are set at equal intervals for low-layer pictures which are the plurality of pictures other than highest-layer pictures belonging to a highest layer among the plurality of hierarchical layers.

Image coding method, image decoding method, image coding apparatus, receiving apparatus, and transmitting apparatus

An image coding method includes: adding, to a candidate list, a first adjacent motion vector as a candidate for a predicted motion vector to be used for coding the current motion vector; selecting the predicted motion vector from the candidate list; and coding the current motion vector, wherein in the adding, the first adjacent motion vector indicating a position in a first reference picture included in a first reference picture list is added to the candidate list for the current motion vector indicating a position in a second reference picture included in a second reference picture list.

Image coding method, image decoding method, image coding apparatus, image decoding apparatus, and image coding and decoding apparatus

An image coding method includes: determining a maximum number of merging candidates; deriving first merging candidates based on blocks spatially or temporally neighboring a current block; determining whether or not a total number of the first merging candidates is smaller than the maximum number; deriving, by making a combination out of the derived first merging candidates, a second merging candidate for bi-directional prediction when it is determined that the total number of the first merging candidates is smaller than the maximum number; selecting a merging candidate to be used for the coding of the current block from the first merging candidates and the second merging candidate; and coding, using the determined maximum number, an index for identifying the selected merging candidate, and attaching the coded index to the bitstream.

Image decoding method and image decoding apparatus using candidate motion vectors

A motion vector calculation method which attains a higher compression rate, includes: a selection step of selecting one of at least one reference motion vector of a reference block; and a calculation step of calculating a motion vector of a current block to be processed, using the one reference motion vector selected in the selection step, and in the selection step, when the reference block has two reference motion vectors, one of the two reference motion vectors is selected based on whether the reference block is located before or after the current block in display time order, and when the reference block has only one reference motion vector, the one reference motion vector is selected.

A method for transmitting a bitstream via a network is provided. The bitstream being generated by: deriving a first candidate having a first motion vector that has been used to code a first block; deriving a second candidate having a second motion vector and a first reference picture index value that identifies a first reference picture corresponding to the second motion vector, with the second motion vector being a first zero vector; deriving a third candidate having a third motion vector and a second reference picture index value that identifies a second reference picture corresponding to the third motion vector, with the third motion vector being a second zero vector. One candidate from a plurality of candidates, including the first, second, and third candidate is selected, and an index identifying the selected one candidate is coded.

Image coding method, image coding apparatus, image decoding method, image decoding apparatus, and image coding and decoding apparatus

A moving picture coding apparatus includes a co-located block information determination unit which determines which one of a forward reference block and a backward reference block will be a co-located block and further determines whether only the unidirectional motion vector of the motion vectors of the co-located block is to be stored in a colPic memory; a temporal motion vector predictor calculation unit which derives a candidate motion vector predictor in temporal motion vector predictor mode using the colPic information stored in the colPic memory; and an inter prediction control unit which determines to code a motion vector using a candidate motion vector predictor having least error from the motion vector derived by motion estimation among candidate motion vector predictors.

Moving picture coding method and moving picture decoding method

A moving picture coding apparatus for coding a current block from among blocks in a picture is provided. A motion vector predictor candidate list, having a fixed size, is generated, with the motion vector predictor candidate list including first and second candidates. The motion vector predictor candidate list is generated by: deriving the first candidate from a first motion vector used to code a first block, with the first block being adjacent to the current block; and deriving the second candidate that has a second motion vector that is a non-zero value vector based on an X-Y axis of a fixed offset value, with the second motion vector not being derived by coding a block adjacent to the current block and the fixed offset value being a non-zero value that is added in a picture header and commonly used for the blocks in the picture.

Derivation method and apparatuses with candidate motion vectors

An image coding method includes: writing, into a sequence parameter set, buffer description defining information for defining a plurality of buffer descriptions; writing, into the sequence parameter set, reference list description defining information for defining a plurality of reference list descriptions corresponding to the buffer descriptions; 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.

A moving picture coding includes: coding a first flag indicating whether or not temporal motion vector prediction is used; when the first flag indicates that the temporal motion vector prediction is used: coding a first parameter for calculating the temporal predictive motion vector; wherein when the first flag indicates that the temporal motion vector prediction is not used, the first parameter is not coded.

Moving picture coding method, moving picture decoding method, moving picture coding apparatus, moving picture decoding apparatus, and moving picture coding and decoding apparatus

A moving picture coding apparatus includes: an inter prediction control unit which determines to code a motion vector using, among candidate predicted motion vectors, a candidate predicted motion vector having the least error with relative to a motion vector derived by motion estimation; a picture type determination unit which generates picture type information; a temporal direction vector calculation unit which derives a candidate predicted motion vector in temporal direct; and a co-located reference direction determination unit which generates, for each picture, a co-located reference direction flag.

Moving picture coding method and moving picture decoding method using a determination whether or not a reference block has two reference motion vectors that refer forward in display order with respect to a current picture

A moving picture decoding apparatus for decoding a current block of a picture is provided. A motion vector candidate list includes motion vector candidates. Each motion vector candidate includes a value. A second candidate is arranged before a first candidate in the motion vector candidate list. The first candidate is sorted before the second candidate in the motion vector candidate list based on the value of the first candidate and the value of the second candidate. An index identifying a motion vector candidate from the motion vector candidate list is decoded, and the current block is generated using the identified motion vector candidate. The value of the first candidate is higher than the value of the second candidate, and the value is based on a number of times the candidate is selected as a motion vector predictor for neighboring blocks.

Coding method and apparatus with candidate motion vectors

An image decoding method which can improve both image quality and coding efficiency is an image decoding method for decoding a coded stream which includes a plurality of processing units and a header for the processing units, the coded stream being generated by coding a moving picture, the processing units including at least one processing unit layered to be split into a plurality of smaller processing units, the image decoding method including specifying a hierarchical layer having a processing unit in which a parameter necessary for decoding is stored, by parsing hierarchy depth information stored in the header, and decoding the processing unit using the parameter stored in the processing unit located at the specified hierarchical layer.

Image decoding method, image coding method, image decoding apparatus, image coding apparatus, program, and integrated circuit

An image coding method includes: generating a first flag indicating whether or not a motion vector predictor is to be selected from among one or more motion vector predictor candidates; generating a second flag indicating whether or not a motion vector predictor is to be selected from among the one or more motion vector predictor candidates in coding a current block to be coded in a predetermined coding mode, when the first flag indicates that a motion vector predictor is to be selected; and generating a coded signal in which the first flag and the second flag are included in header information, when the first flag indicates that a motion vector predictor is to be selected.

Image coding method, image decoding method, image coding apparatus, and image decoding apparatus

A moving picture coding apparatus includes an intra-inter prediction unit which calculates a second motion vector by performing a scaling process on a first motion vector of a temporally neighboring corresponding block, when selectively adding, to a list, a motion vector of each of one or more corresponding blocks each of which is either a block included in a current picture to be coded and spatially neighboring a current block to be coded or a block included in a picture other than the current picture and temporally neighboring the current block, determines whether the second motion vector has a magnitude that is within a predetermined magnitude or not within the predetermined magnitude, and adds the second motion vector to the list when the intra-inter prediction unit determines that the second motion vector has a magnitude that is within the predetermined magnitude range.

Moving picture coding method, moving picture coding apparatus, moving picture decoding method, moving picture decoding apparatus, and moving picture coding and decoding apparatus

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Osaka, Japan

Hisao Sasai