公开(公告)号：US20210314578A1

公开(公告)日：2021-10-07

申请号：US17350701

申请日：2021-06-17

Applicant: Sun Patent Trust

Inventor： Hisao SASAI ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU

IPC: H04N19/176 ,  H04N19/196 ,  H04N19/13 ,  H04N19/61 ,  H04N19/463 ,  H04N19/157 ,  H04N19/21 ,  H04N19/124 ,  H04N19/159 ,  H04N19/593

Abstract: The image decoding method includes: determining a context for use in a current block to be processed, from among a plurality of contexts; and performing arithmetic decoding on a bit sequence corresponding to the current block, using the determined context, wherein in the determining: 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; 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, and the second type is one of “ref_idx_l0” and “ref_idx_l1”.

公开(公告)号：US20210127132A1

公开(公告)日：2021-04-29

申请号：US17139039

申请日：2020-12-31

Applicant: Sun Patent Trust

Inventor： Viktor WAHADANIAH ,  Chong Soon LIM ,  Sue Mon Thet NAING ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Hisao SASAI ,  Toshiyasu SUGIO

IPC: H04N19/573 ,  H04N19/70 ,  H04N19/65 ,  H04N19/31 ,  H04N19/593 ,  H04N19/159

Abstract: A video encoding method using a plurality of reference pictures includes: selecting whether or not a resilient picture referencing scheme is to be used for encoding video; writing a parameter indicating the selection into a header of an encoded video bitstream; and encoding a picture using inter-picture prediction using a result of the selection.

公开(公告)号：US20210105501A1

公开(公告)日：2021-04-08

申请号：US17124689

申请日：2020-12-17

Applicant: Sun Patent Trust

Inventor： Toshiyasu SUGIO ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Hisao SASAI

IPC: H04N19/513 ,  H04N19/52 ,  H04N19/31 ,  H04N19/573

Abstract: 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.

公开(公告)号：US20210105498A1

公开(公告)日：2021-04-08

申请号：US17124659

申请日：2020-12-17

Applicant: Sun Patent Trust

Inventor： Sue Mon Thet NAING ,  Chong Soon LIM ,  Kyaw Kyaw WIN ,  Hai Wei SUN ,  Viktor WAHADANIAH ,  Takahiro NISHI ,  Hisao SASAI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU ,  Kengo TERADA

IPC: H04N19/51 ,  H04N19/70 ,  H04N19/172 ,  H04N19/46 ,  H04N19/107 ,  H04N19/52 ,  H04N19/105

Abstract: An image coding method includes: selecting a first picture from plural pictures; 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; coding the first picture without using the temporal motion vector prediction; 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.

公开(公告)号：US20210084326A1

公开(公告)日：2021-03-18

申请号：US17102608

申请日：2020-11-24

Applicant: Sun Patent Trust

Inventor： Toshiyasu SUGIO ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Kyoko TANIKAWA ,  Hisao SASAI ,  Toru MATSUNOBU ,  Kengo TERADA

IPC: H04N19/52 ,  H04N19/105 ,  H04N19/159 ,  H04N19/46 ,  H04N19/503

Abstract: 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.

公开(公告)号：US20210084306A1

公开(公告)日：2021-03-18

申请号：US17106685

申请日：2020-11-30

Applicant: Sun Patent Trust

Inventor： Hisao SASAI ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Virginie DRUGEON

IPC: H04N19/14 ,  H04N19/463 ,  H04N19/103 ,  H04N19/176

Abstract: An image decoding method includes: restoring a selected prediction mode used in prediction at a time of coding; and decoding a current block included in coded image data to generate a decoded block, according to the prediction based on the selected prediction mode. The restoring includes: determining a first estimated prediction mode; determining a second estimated prediction mode different from the first estimated prediction mode; and restoring the selected prediction mode based on the mode information, the first estimated prediction mode, and the second estimated prediction mode.

公开(公告)号：US20210006814A1

公开(公告)日：2021-01-07

申请号：US17027859

申请日：2020-09-22

Applicant: Sun Patent Trust

Inventor： Viktor WAHADANIAH ,  Chong Soon LIM ,  Sue Mon Thet NAING ,  Hai Wei SUN ,  Takahiro NISHI ,  Hisao SASAI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU ,  Kengo TERADA

IPC: H04N19/50 ,  H04N19/70 ,  H04N19/174 ,  H04N19/58 ,  H04N19/15 ,  H04N19/105 ,  H04N19/30

Abstract: An image coding method includes: writing, into a sequence parameter set, buffer description defining information for defining a plurality of buffer descriptions; selecting one of the buffer descriptions for each processing unit that is a picture or a slice, and writing buffer description selecting information for specifying the selected buffer description, into a first header of the processing unit which is included in the coded bitstream; and coding the processing unit using the selected buffer description, and the buffer description defining information includes long-term information for identifying, among a plurality of reference pictures indicated in the buffer descriptions, a reference picture to be assigned as a long-term reference picture.

公开(公告)号：US20200296407A1

公开(公告)日：2020-09-17

申请号：US16890404

申请日：2020-06-02

Applicant: Sun Patent Trust

Inventor： Chong Soon LIM ,  Sue Mon Thet NAING ,  Takahiro NISHI ,  Hisao SASAI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU ,  Kengo TERADA

IPC: H04N19/513 ,  H04N19/176 ,  H04N19/103 ,  H04N19/52 ,  H04N19/70 ,  H04N19/44

Abstract: A method of performing motion vector prediction for a current block in a picture is provided which includes: deriving a candidate for a motion vector predictor to code a current motion vector of the current block, from a first motion vector of a first block that is spatially adjacent or temporally adjacent to the current block; adding the derived candidate to a list of candidates; and deriving at least one motion vector predictor based on a selected candidate from the list of candidates, wherein the deriving of the candidate includes determining whether to derive the candidate from the first motion vector, based on a type of a current reference picture and a type of a first reference picture, the current reference picture being referred to from the current block using the current motion vector, the first reference picture being referred to from the first block using the first motion vector.

公开(公告)号：US20200244957A1

公开(公告)日：2020-07-30

申请号：US16850330

申请日：2020-04-16

Applicant: Sun Patent Trust

Inventor： Hisao SASAI ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU ,  Kengo TERADA

IPC: H04N19/117 ,  H04N19/61 ,  H04N19/136 ,  H04N19/176

Abstract: A decoding method includes: predicting a current block in an image using a reference block, to generate a prediction block; and generating a reconstructed block using the prediction block, wherein the generating includes: filtering for a boundary between the reconstructed block and a decoded neighboring block, using a first filter strength set using first prediction information for prediction of the current block and second prediction information for prediction of the decoded neighboring block; filtering for the boundary using a second filter strength set without using the second prediction information of the current block and the decoded neighboring block; and switching whether to execute the second filtering, based on the boundary, wherein the first filtering is in-loop filtering in which a filtered reconstructed block is used as a reference block for another block, and the second filtering is post filtering outside the loop.

公开(公告)号：US20200162753A1

公开(公告)日：2020-05-21

申请号：US16752857

申请日：2020-01-27

Applicant: Sun Patent Trust

Inventor： Hisao SASAI ,  Takahiro NISHI ,  Youji SHIBAHARA ,  Toshiyasu SUGIO ,  Kyoko TANIKAWA ,  Toru MATSUNOBU

IPC: H04N19/50 ,  H04N19/85 ,  H04N19/436 ,  H04N19/13 ,  H04N19/157 ,  H04N19/196 ,  H04N19/91 ,  H04N19/61 ,  H04N19/70 ,  H04N19/176

Abstract: A moving picture coding method includes (i) transforming, for each of one or more second processing units included in the first processing unit, a moving picture signal in a spatial domain into a frequency domain coefficient and quantizing the frequency domain coefficient, and (ii) performing arithmetic coding on a luminance CBF flag indicating whether or not a quantized coefficient is included in the second processing unit in which transform and quantization are performed, wherein, in the arithmetic coding, a probability table for use in arithmetic coding is determined according to whether or not the size of the first processing unit is identical to the size of the second processing unit and whether or not the second processing unit has a predetermined maximum size.