公开(公告)号：US12132894B2

公开(公告)日：2024-10-29

申请号：US18368140

申请日：2023-09-14

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625

CPC classification number: H04N19/11 ,  H04N19/159 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625

Abstract: An encoder that encodes a current block in a picture includes circuitry and memory. Using the memory, the circuitry: determines whether to use intra prediction for the current block; and when determining to use intra prediction, (i) performs a first transform on a residual signal of the current block using a first transform basis to generate first transform coefficients; and (ii-1) performs a second transform on the first transform coefficients using a second transform basis to generate second transform coefficients and quantizes the second transform coefficients, when an intra prediction mode of the current block is a predetermined mode or when the first transform basis is same as a predetermined transform basis; and (ii-2) quantizes the first transform coefficients without performing the second transform when the intra prediction mode is different from the predetermined mode and the first transform basis is different from the predetermined transform basis.

公开(公告)号：US10863174B2

公开(公告)日：2020-12-08

申请号：US16433295

申请日：2019-06-06

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Hideo Saitou ,  Masato Ohkawa ,  Takahiro Nishi ,  Tadamasa Toma

IPC: H04N19/117 ,  H04N19/176 ,  G06F17/18

Abstract: An encoder includes circuitry and memory. Using the memory, the circuitry: generates a reconstructed image by encoding and decoding an original image; performs, on a current block included in the reconstructed image, filter processing that is applied to all pixels in the current block, when an edge intensity of the current block is lower than a threshold; and skips the filter processing on the current block when the edge intensity of the current block is higher than the threshold.

公开(公告)号：US12120349B2

公开(公告)日：2024-10-15

申请号：US17889580

申请日：2022-08-17

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Ryuichi Kanoh ,  Tadamasa Toma ,  Kiyofumi Abe ,  Takahiro Nishi ,  Masato Ohkawa ,  Hideo Saitou

IPC: H04N11/02 ,  H04N19/124 ,  H04N19/176 ,  H04N19/44 ,  H04N19/60

CPC classification number: H04N19/60 ,  H04N19/124 ,  H04N19/176 ,  H04N19/45

Abstract: An encoder which transforms a current block to be encoded in an image to encode the current block includes circuitry and memory. The circuitry, using the memory: determines a plurality of first transform basis candidates and transforms the current block using a transform basis included in the plurality of first transform basis candidates determined, when the current block has a first size; and determines one or more second transform basis candidates different from the plurality of first transform basis candidates and transforms the current block using a transform basis included in the one or more second transform basis candidates determined, when the current block has a second size larger than the first size.

公开(公告)号：US11044481B2

公开(公告)日：2021-06-22

申请号：US16697525

申请日：2019-11-27

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

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

Abstract: An encoder which encodes a current block of a picture includes a processor and memory. Using the memory, the processor: determines whether intra prediction is to be used for the current block; and when it is determined that intra prediction is to be used for the current block, generates first transform coefficients by performing first transform of residual signals of the current block using a first transform basis; quantizes the first transform coefficients when an intra prediction mode for the current block is a determined mode and the first transform basis is different from a determined transform basis; 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 for the current block is not the determined mode or when the first transform basis matches the determined transform basis.

公开(公告)号：US10742977B2

公开(公告)日：2020-08-11

申请号：US16738398

申请日：2020-01-09

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

IPC: H03M7/30 ,  G06K9/36 ,  H04N19/12 ,  H04N19/124 ,  H04N19/18 ,  H04N19/625 ,  H04N19/61

Abstract: An encoder that encodes a current block in a picture includes circuitry and memory. Using the memory, the circuitry: performs a first transform on a residual signal of the current block using a first transform basis to generate first transform coefficients; and performs a second transform on the first transform coefficients using a second transform basis to generate second transform coefficients and quantizes the second transform coefficients, when the first transform basis is the same as a predetermined transform basis; and quantizes the first transform coefficients without performing the second transform, when the first transform basis is different from the predetermined transform basis.

公开(公告)号：US12096005B2

公开(公告)日：2024-09-17

申请号：US18376618

申请日：2023-10-04

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

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

CPC classification number: H04N19/159 ,  H04N19/176 ,  H04N19/61 ,  H04N19/625

Abstract: An encoder which encodes a current block of a picture includes a processor and memory. Using the memory, the processor: determines whether intra prediction is to be used for the current block; and when it is determined that intra prediction is to be used for the current block, generates first transform coefficients by performing first transform of residual signals of the current block using a first transform basis; quantizes the first transform coefficients when an intra prediction mode for the current block is a determined mode and the first transform basis is different from a determined transform basis; 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 for the current block is not the determined mode or when the first transform basis matches the determined transform basis.

公开(公告)号：US11729386B2

公开(公告)日：2023-08-15

申请号：US16911810

申请日：2020-06-25

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

IPC: H04N19/12 ,  H04N19/124 ,  H04N19/176 ,  H04N19/625

CPC classification number: H04N19/12 ,  H04N19/124 ,  H04N19/176 ,  H04N19/625

Abstract: When a transform-basis adaptive selection mode is enabled, an encoder that transforms residuals of a current block to encode an image: adaptively selects a first horizontal transform basis from among one or more transform basis candidates when a horizontal size of the current block is greater than a first horizontal threshold size; otherwise selects a fixed horizontal transform basis as a first horizontal transform basis; adaptively selects a first vertical transform basis from among the one or more transform basis candidates when a vertical size of the current block is greater than a first vertical threshold size; otherwise selects a fixed vertical transform basis as a first vertical transform basis; and generates first transform coefficients by performing a first horizontal transform and a first vertical transform on the residuals of the current block, using the first horizontal transform basis selected and the first vertical transform basis selected, respectively.

公开(公告)号：US11375207B2

公开(公告)日：2022-06-28

申请号：US17188448

申请日：2021-03-01

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

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

Abstract: An encoder which encodes a current block of a picture includes a processor and memory. Using the memory, the processor: determines whether intra prediction is to be used for the current block; and when it is determined that intra prediction is to be used for the current block, generates first transform coefficients by performing first transform of residual signals of the current block using a first transform basis; quantizes the first transform coefficients when an intra prediction mode for the current block is a determined mode and the first transform basis is different from a determined transform basis; 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 for the current block is not the determined mode or when the first transform basis matches the determined transform basis.

公开(公告)号：US11102489B2

公开(公告)日：2021-08-24

申请号：US16697534

申请日：2019-11-27

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

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

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：US11076150B2

公开(公告)日：2021-07-27

申请号：US16733774

申请日：2020-01-03

Applicant: Panasonic Intellectual Property Corporation of America

Inventor： Masato Ohkawa ,  Hideo Saitou ,  Tadamasa Toma ,  Takahiro Nishi ,  Kiyofumi Abe ,  Ryuichi Kanoh

IPC: H04N19/11 ,  H04N19/159 ,  H04N19/625 ,  H04N19/61 ,  H04N19/176

Abstract: An encoder that encodes a current block in a picture includes circuitry and memory. Using the memory, the circuitry: determines whether to use intra prediction for the current block; and when determining to use intra prediction, (i) performs a first transform on a residual signal of the current block using a first transform basis to generate first transform coefficients; and (ii-1) performs a second transform on the first transform coefficients using a second transform basis to generate second transform coefficients and quantizes the second transform coefficients, when an intra prediction mode of the current block is a predetermined mode or when the first transform basis is same as a predetermined transform basis; and (ii-2) quantizes the first transform coefficients without performing the second transform when the intra prediction mode is different from the predetermined mode and the first transform basis is different from the predetermined transform basis.