公开(公告)号：US20220070500A1

公开(公告)日：2022-03-03

申请号：US17507571

申请日：2021-10-21

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Jing Ya LI ,  Han Boon TEO ,  Chong Soon LIM ,  Hai Wei SUN ,  Che-Wei KUO ,  Chu Tong WANG ,  Tadamasa TOMA ,  Takahiro NISHI ,  Kiyofumi ABE ,  Yusuke KATO

IPC: H04N19/82 ,  H04N19/107 ,  H04N19/176 ,  H04N19/186

Abstract: A decoder includes memory and a processor coupled to the memory and configured to: generate a first coefficient value by applying a CCALF (cross component adaptive loop filtering) process to a first reconstructed image sample of a luma component; clip the first coefficient value such that the clipped first coefficient value is within a first range from −27 to 27−1; generate a second coefficient value by applying an ALF (adaptive loop filtering) process to a second reconstructed image sample of a chroma component; clip the second coefficient value such that the clipped second coefficient value is within a second range different from the first range; generate a third coefficient value by adding the clipped first coefficient value to the clipped second coefficient value; and generate a third reconstructed image sample of the chroma component using the third coefficient value.

公开(公告)号：US20220014747A1

公开(公告)日：2022-01-13

申请号：US17486659

申请日：2021-09-27

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Kiyofumi ABE ,  Ryuichi KANOH ,  Takahiro NISHI ,  Tadamasa TOMA

IPC: H04N19/126 ,  H04N19/105 ,  H04N19/119 ,  H04N19/176 ,  H04N19/30 ,  H04N19/94

Abstract: Various embodiments provide an encoder that generates a plurality of quantization matrix elements for a current block; generates a quantization matrix using the plurality of quantization matrix elements; and quantizes, using the quantization matrix, transform coefficients of the current block. The quantization matrix includes only a subset of quantization matrix elements of the plurality of quantization matrix elements. Each of the subset of quantization matrix elements has an x-coordinate value less than a threshold x-coordinate value, a y-coordinate value less than a threshold y-coordinate value, or an x-coordinate value less than the threshold x-coordinate value and a y-coordinate value less than the threshold y-coordinate value.

公开(公告)号：US20210409759A1

公开(公告)日：2021-12-30

申请号：US17473479

申请日：2021-09-13

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Kiyofumi ABE ,  Takahiro NISHI ,  Tadamasa TOMA ,  Ryuichi KANOH

IPC: H04N19/537 ,  H04N19/105 ,  H04N19/157 ,  H04N19/52 ,  H04N19/573

Abstract: An encoder includes memory and circuitry. The circuitry: derives a first motion vector in a unit of a prediction block using a first inter frame prediction mode that uses a degree of matching between two reconstructed images of two regions in two difference pictures, the prediction block being obtained by splitting an image included in a video; and performs, in the unit of the prediction block, a first motion compensation process that generates a prediction image by referring to a spatial gradient of luminance in an image generated by performing motion compensation using the first motion vector derived.

公开(公告)号：US20210377556A1

公开(公告)日：2021-12-02

申请号：US17403456

申请日：2021-08-16

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Takashi HASHIMOTO ,  Kiyofumi ABE ,  Tadamasa TOMA ,  Takahiro NISHI ,  Ryuichi KANOH

IPC: H04N19/51 ,  H04N19/433

Abstract: An encoding method is provided for encoding a picture to generate a coded stream. The encoding method incldues: generating a first prediction image of a current block included in a current picture by referring to a first region included in a reference picture different from the current picture; operating a bi-directional optical flow process to generate a second prediction image based on the first prediction image by referring to a second region included in the first region, and not operating the bi-directional optical flow process by referring to a third region not included in the first region; and encoding the current block based on the second prediction image.

公开(公告)号：US20210377537A1

公开(公告)日：2021-12-02

申请号：US17396984

申请日：2021-08-09

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tadamasa TOMA ,  Takahiro NISHI ,  Kiyofumi ABE ,  Yusuke KATO

IPC: H04N19/13 ,  H04N19/70 ,  H04N19/176 ,  H04N19/174 ,  H04N19/172 ,  H04N19/184 ,  H04N19/136

Abstract: An encoder includes circuitry and memory connected thereto. The circuitry, in operation: encodes an image; when encoding the image: binarizes coefficient information of the image; controls whether to apply arithmetic encoding to a binary data string obtained by binarizing the coefficient information; and outputs a bitstream including the binary data string to which arithmetic encoding has been applied or has not been applied; and when binarizing the coefficient information: binarizes the coefficient information according to a first syntax structure when arithmetic encoding is to be applied to the binary data string and a determined condition is not satisfied; binarizes the coefficient information according to a second syntax structure when arithmetic encoding is to be applied to the binary data string and the determined condition is satisfied; and binarizes the coefficient information according to the second syntax structure when no arithmetic encoding is to be applied to the binary data string.

公开(公告)号：US20210344957A1

公开(公告)日：2021-11-04

申请号：US17373069

申请日：2021-07-12

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Chong Soon LIM ,  Han Boon TEO ,  Takahiro NISHI ,  Tadamasa TOMA ,  Ru Ling LIAO ,  Sughosh Pavan SHASHIDHAR ,  Hai Wei SUN

IPC: H04N19/597 ,  H04N19/176 ,  H04N19/46 ,  H04N19/159 ,  G06T5/00 ,  H04N19/85

Abstract: An encoder capable of properly handling an image to be encoded or decoded includes processing circuitry and memory connected to the processing circuitry. Using the memory, the processing circuitry: obtains parameters including at least one of (i) one or more parameters related to a first process for correcting distortion in an image captured with a wide angle lens and (ii) one or more parameters related to a second process for stitching a plurality of images; generates an encoded image by encoding a current image to be processed that is based on the image or the plurality of images; and writes the parameters into a bitstream including the encoded image.

公开(公告)号：US20210344923A1

公开(公告)日：2021-11-04

申请号：US17377107

申请日：2021-07-15

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tadamasa TOMA ,  Takahiro NISHI ,  Kiyofumi ABE ,  Yusuke KATO

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/136 ,  H04N19/61 ,  H04N19/157

Abstract: An encoder includes circuitry and memory coupled to the circuitry. In operation, the circuitry: performs quantization on a plurality of transform coefficients of a current block to be encoded, using a quantization matrix when orthogonal transform is performed on the current block and secondary transform is not performed on the current block; and performs quantization on the plurality of transform coefficients of the current block without using the quantization matrix when orthogonal transform is not performed on the current block and when both orthogonal transform and secondary transform are performed on the current block.

公开(公告)号：US20210329280A1

公开(公告)日：2021-10-21

申请号：US17356839

申请日：2021-06-24

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Kiyofumi ABE ,  Takahiro NISHI ,  Tadamasa TOMA

IPC: H04N19/423 ,  H04N19/176 ,  H04N19/517 ,  H04N19/105

Abstract: An encoder includes circuitry and memory. Using the memory, the circuitry performs prediction on an image. A motion vector predictor list used in the prediction includes a spatially neighboring motion vector predictor obtained from a block spatially neighboring a current block, and a spatially broad motion vector predictor obtained from a block positioned at any of a plurality of predetermined positions in a second range that is broader than a first range that spatially neighbors the current block. The plurality of predetermined positions are defined by a regular interval using the top-left of a current picture as a reference point.

公开(公告)号：US20210321117A1

公开(公告)日：2021-10-14

申请号：US17355596

申请日：2021-06-23

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato OHKAWA ,  Hideo SAITOU ,  Tadamasa TOMA ,  Takahiro NISHI ,  Kiyofumi ABE ,  Ryuichi KANOH

IPC: H04N19/159 ,  H04N19/12 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625

Abstract: When intra prediction is to be used, an encoder determines whether an adaptive basis selection mode is to be used and whether a size of the current block matches a determined size. When the adaptive basis selection mode is to be used and the size matches the determined size, the encoder fixes the first transform basis for the current block to a first determined transform basis in the adaptive basis selection mode, and generates first transform coefficients by performing first transform of residual signals of the current block using the first determined transform basis; quantizes the first transform coefficients when an intra prediction mode for the current block is a determined mode; and generates second transform coefficients by performing second transform of the first transform coefficients using a second transform basis, and quantizes the second transform coefficients, when the intra prediction mode is not the determined mode.

公开(公告)号：US20210211661A1

公开(公告)日：2021-07-08

申请号：US17194781

申请日：2021-03-08

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Tadamasa TOMA ,  Takahiro NISHI ,  Kiyofumi ABE

IPC: H04N19/119 ,  H04N19/159 ,  H04N19/105 ,  H04N19/117 ,  H04N19/82 ,  H04N19/52 ,  H04N19/174

Abstract: An encoder includes circuitry and memory connected to the circuitry. The circuitry, in operation: splits one picture included in pictures into areas, intra encodes the entirety of an area among the areas; and switches areas to be intra encoded for each picture included in the pictures. In at least one of (i) generation of a reference pixel in inter prediction or (ii) loop filtering, only pixels in the area intra encoded or pixels in an area which precedes the area intra encoded in coding order are used among pixels included in the pictures.