公开(公告)号：US20240212219A1

公开(公告)日：2024-06-27

申请号：US18594466

申请日：2024-03-04

Applicant: KDDI CORPORATION

Inventor： Kouhei MATSUZAKI ,  Kei KAWAMURA ,  Kyohei UNNO

IPC: G06T9/00 ,  G06T9/40

CPC classification number: G06T9/001 ,  G06T9/40

Abstract: A point cloud decoding device (200) according to the present invention including a circuit, wherein the circuit: stores occupancy information of a child hierarchical node indicating whether or not the child hierarchical node is occupied; and predicts occupancy information of a child node indicating whether or not the child node is occupied using the occupancy information of the child hierarchical node.

公开(公告)号：US20220174283A1

公开(公告)日：2022-06-02

申请号：US17674761

申请日：2022-02-17

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA ,  Sei NAITO

IPC: H04N19/124 ,  H04N19/132 ,  H04N19/176

Abstract: An image decoding device includes a quantization parameter deriving unit configured to correct a value of a decoded quantization parameter of a target block depending on whether or not adaptive color transform has been applied to the target block, and then set, as the quantization parameter of the target block, the larger of the corrected value of the quantization parameter and a predetermined value of “0” or more.

公开(公告)号：US20240289994A1

公开(公告)日：2024-08-29

申请号：US18595157

申请日：2024-03-04

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA

IPC: G06T9/00 ,  G06T7/62

CPC classification number: G06T9/001 ,  G06T7/62

Abstract: A point cloud decoding device (200) including a circuit that selects, as a projection plane, a projection plane having a largest area of a polygon defined by a plurality of vertices existing on sides of a node when the plurality of vertices are projected onto each of a plurality of projection plane candidates, from among the plurality of projection plane candidates.

公开(公告)号：US20230133644A1

公开(公告)日：2023-05-04

申请号：US18069054

申请日：2022-12-20

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA

IPC: G06T9/00 ,  G06T9/40

Abstract: A point-cloud decoding device according to the present invention includes: a tree synthesizing unit configured to generate Mask_planar corresponding to eight child nodes of a node, wherein in a case where the node is subjected to quadtree division or binary tree division, the tree synthesizing unit (2020) is configured to set, as “0”, a value of the Mask_planar corresponding to a child node belonging to a plane closer to an origin in an axial direction in which no division is made, and set, as “1”, a value of the Mask_planar corresponding to a child node belonging to a plane further away from the origin in the axial direction in which no division is made.

公开(公告)号：US20230109719A1

公开(公告)日：2023-04-13

申请号：US17615543

申请日：2020-12-02

Applicant: KDDI CORPORATION

Inventor： Yoshitaka KIDANI ,  Kei KAWAMURA ,  Kyohei UNNO ,  Sei NAITO

IPC: H04N19/105 ,  H04N19/176 ,  H04N19/46

Abstract: An image decoding device (200) includes: a merge unit (241A2) configured to apply geometric block partitioning merge to a target block divided in a rectangular shape, wherein the merge unit (241A2) includes: a merge mode specifying unit (241A21) configured to specify whether or not the geometric block partitioning merge is applied; a geometric block partitioning unit (241A22) configured to specify a geometric block partitioning pattern and further perform geometric block partitioning on the target block divided in the rectangular shape by using the specified geometric block partitioning pattern; and a merge list construction unit (241A23) configured to construct a merge list for the target block subjected to the geometric block partitioning and decode motion information.

公开(公告)号：US20220345740A1

公开(公告)日：2022-10-27

申请号：US17860485

申请日：2022-07-08

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA ,  Sei NAITO

IPC: H04N19/57 ,  H04N19/105 ,  H04N19/176 ,  H04N19/182 ,  H04N19/513 ,  H04N19/52

Abstract: An image decoding device includes a prediction unit configured to generate a prediction signal included in a prediction block based on a motion vector. The prediction unit is configured to perform refinement processing of setting a search range based on a reference position specified by the motion vector, specifying a corrected reference position having the smallest predetermined cost from the search range, and correcting the motion vector based on the corrected reference position. When a block size of the prediction block is larger than a predetermined block size, the prediction unit is configured to divide the prediction block into sub-block groups and perform the refinement processing for each sub-block.

公开(公告)号：US20250024026A1

公开(公告)日：2025-01-16

申请号：US18903761

申请日：2024-10-01

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA ,  Sei NAITO

IPC: H04N19/105 ,  H04N19/139 ,  H04N19/176 ,  H04N19/513

Abstract: An image decoding device includes: a motion vector decoding unit that decodes a motion vector from encoded data; a refinement unit that performs refinement processing to correct the decoded motion vector; and a predictive signal generation unit that generates a predictive signal on the basis of the corrected motion vector outputted from the refinement unit. The predictive signal generation unit determines whether or not to apply BDOF processing for each block, on the basis of information calculated in the course of the refinement processing.

公开(公告)号：US20230336760A1

公开(公告)日：2023-10-19

申请号：US18212182

申请日：2023-06-21

Applicant: KDDI CORPORATION

Inventor： Kei KAWAMURA ,  Kyohei UNNO

IPC: H04N19/12 ,  H04N19/42 ,  H04N19/85 ,  H04N19/18 ,  H04N19/463 ,  H04N19/60 ,  H04N19/184

CPC classification number: H04N19/463 ,  H04N19/12 ,  H04N19/18 ,  H04N19/184 ,  H04N19/42 ,  H04N19/60 ,  H04N19/85

Abstract: An image decoding device 200 includes: a local addition unit 104a that adds level values of decoded residual coefficients existing around a residual coefficient to be decoded and derives a sum total value of level; a transform unit 104b that transforms the sum total value of level into an amount of shift and an index; a table reference unit 104c that refers to a predefined table and outputs a pre-correction Rice parameter corresponding to the index; and a correction unit 104d that derives a post-correction Rice parameter on the basis of the pre-correction Rice parameter and the amount of shift.

公开(公告)号：US20230224508A1

公开(公告)日：2023-07-13

申请号：US18118969

申请日：2023-03-08

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA

IPC: H04N19/96 ,  H04N19/124 ,  H04N19/186

CPC classification number: H04N19/96 ,  H04N19/124 ,  H04N19/186

Abstract: A point cloud decoding device 200 according to the present invention including: an attribute-information decoding unit 2060 that determines whether or not a chroma signal is included in a bit stream, and avoids decoding for syntax regarding the chroma signal in a case where the chroma signal is determined not to be included in the bit stream.

公开(公告)号：US20230222700A1

公开(公告)日：2023-07-13

申请号：US18118880

申请日：2023-03-08

Applicant: KDDI CORPORATION

Inventor： Kyohei UNNO ,  Kei KAWAMURA

IPC: G06T9/40

CPC classification number: G06T9/40

Abstract: A point cloud decoding device according to the present invention 200 includes: a geometry information decoding unit 2010 that decodes a first flag used to indicate whether or not to carry out inverse quantization of position information from a bit stream; and a tree synthesizing unit 2020 that sets a value of NodeQp to zero in a case where the first flag indicates that the inverse quantization of the position information is not carried out, the NodeQp being used as a quantization parameter for each node.