公开(公告)号：US11854112B1

公开(公告)日：2023-12-26

申请号：US17663820

申请日：2022-05-17

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Deepak S Tolani ,  Alexandros Tourapis

IPC: G06T15/04 ,  G06T17/20 ,  G06T9/00 ,  G06T15/08 ,  G06T11/40

CPC classification number: G06T15/04 ,  G06T9/00 ,  G06T11/40 ,  G06T15/08 ,  G06T17/20

Abstract: A system compresses and decompresses attribute information for visual volumetric content, such as a mesh representation. Attribute values are included in the visual volumetric representation, wherein at least some of the attribute values include unitary vectors, such as surface normal vectors or surface tangent vectors having a magnitude of one unit. In order to compress the attribute information the three-dimensional unit vectors are mapped into two dimensional parametric coordinates for a planar representation of a unit sphere. To reduce negative effects on compression due to distortion or discontinuities in the planar representation, mappings for compressing respective unit vectors are adaptively selected.

公开(公告)号：US20230316655A1

公开(公告)日：2023-10-05

申请号：US18166164

申请日：2023-02-08

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G06T17/20 ,  G06T9/00

CPC classification number: G06T17/205 ,  G06T9/001

Abstract: A three-dimensional (3D) mesh encoder is provided. The 3D mesh encoder can include a preprocessing stage configured to generate the mesh M by re-sampling the mesh M and computing a new atlas of parametrization with a fewer number of patches and relatively lower parameterization distortion. The 3D mesh encoder may include an attribute transfer stage for transferring attributes to the re-sampled mesh M.

公开(公告)号：US20230290063A1

公开(公告)日：2023-09-14

申请号：US18166213

申请日：2023-02-08

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G06T17/20 ,  G06T9/00 ,  G06V10/25

CPC classification number: G06T17/20 ,  G06T9/001 ,  G06V10/25

Abstract: A method of post processing a decoded 3D textured mesh to adaptively tesselate the mesh, can include: receiving from a mesh decoder one or more of metadata(i) describing various information about the mesh structure, a decoded base mesh m′(i), displacements d′(i) associated with the vertices of the decoded base mesh, and optionally one or more attribute maps A′(i) describing information associated with the mesh surface; and receiving control parameters from an application consuming the decoded 3D textured mesh; and performing one or more subdivisions of the decoded base mesh m′(i) based on the received control information.

公开(公告)号：US11754685B2

公开(公告)日：2023-09-12

申请号：US17935009

申请日：2022-09-23

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G01S7/4861 ,  G01S17/42 ,  H03M7/30 ,  G01S17/89

CPC classification number: G01S7/4861 ,  G01S17/42 ,  H03M7/3062 ,  G01S17/89

Abstract: A system comprises an encoder configured to compress attribute information for a point cloud and/or a decoder configured to decompress compressed attribute information. Attribute values for at least one starting point are included in a compressed attribute information file and attribute correction values are included in the compressed attribute information file. An order for the points is determined based on a space filling curve, wherein an encoder and a decoder determine a same order for the points based on the space filling curve. Levels of detail are determined by sampling the ordered points according to different sampling parameters, and attribute values are predicted for the points in the levels of detail using the determined order. The encoder determines attribute correction values based on a comparison of the predicted values to an original value prior to compression. The decoder corrects the predicted attribute values based on received attribute correction values.

公开(公告)号：US11699249B2

公开(公告)日：2023-07-11

申请号：US17817920

申请日：2022-08-05

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  David Flynn ,  Zhenzhen Gao

IPC: G06T9/00 ,  G06T7/70 ,  G06T11/20 ,  G06F18/2413 ,  G06F18/22 ,  G06V10/764

CPC classification number: G06T9/004 ,  G06F18/22 ,  G06F18/24147 ,  G06T7/70 ,  G06T11/20 ,  G06V10/764 ,  G06T2207/10028 ,  G06T2210/12 ,  G06T2210/36

Abstract: A search space for performing nearest neighbor searches for encoding point cloud data may be trimmed. Ranges of a space filling curve may be used to identify search space to exclude or reuse, instead of generating nearest neighbor search results for at least some of the points of a point cloud located within some of the ranges of the space filling curve. Additionally, neighboring voxels may be searched to identify any neighboring points missed during the trimmed search based on the ranges of the space filling curve.

公开(公告)号：US11606569B2

公开(公告)日：2023-03-14

申请号：US16583153

申请日：2019-09-25

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Yeping Su ,  Khaled Mammou ,  Jungsun Kim ,  David W. Singer ,  Fabrice A. Robinet ,  Guy Cote ,  Jim C. Chou ,  Hsi-Jung Wu

IPC: H04N19/186 ,  H04N19/159 ,  H04N19/176 ,  H04N19/124

Abstract: Support for additional components may be specified in a coding scheme for image data. A layer of a coding scheme that specifies color components may also specify additional components. Characteristics of the components may be specified in the same layer or a different layer of the coding scheme. An encoder or decoder may identify the specified components and determine the respective characteristics to perform encoding and decoding of image data.

公开(公告)号：US20230076939A1

公开(公告)日：2023-03-09

申请号：US17942032

申请日：2022-09-09

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Arnold H. Cachelin ,  David Flynn ,  Fabrice A. Robinet ,  Jungsun Kim

IPC: G06T17/10 ,  G06T17/20 ,  G06T9/00

Abstract: In an example method, a system obtains first data representing a plurality of polygons of a polygon mesh, and performs several operations for each of the polygons, including (i) determining a number of sample points for that polygon, where the number of sample points is determined based on at least one of an area of that polygon or an area of the polygon mesh, (ii) determining a distribution of the sample points for that polygon, and (iii) sampling the polygon mesh in accordance with the determined number of sample points and the determined distribution of sample points, where sampling the polygon mesh includes determining one or more characteristics of the polygon mesh at each of the sample points. The system also outputs second data representing the one or more characteristics of the polygon mesh at one or more of the sample points.

公开(公告)号：US20230072818A1

公开(公告)日：2023-03-09

申请号：US17935009

申请日：2022-09-23

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G01S7/4861 ,  G01S17/42 ,  H03M7/30

Abstract: A system comprises an encoder configured to compress attribute information for a point cloud and/or a decoder configured to decompress compressed attribute information. Attribute values for at least one starting point are included in a compressed attribute information file and attribute correction values are included in the compressed attribute information file. An order for the points is determined based on a space filling curve, wherein an encoder and a decoder determine a same order for the points based on the space filling curve. Levels of detail are determined by sampling the ordered points according to different sampling parameters, and attribute values are predicted for the points in the levels of detail using the determined order. The encoder determines attribute correction values based on a comparison of the predicted values to an original value prior to compression. The decoder corrects the predicted attribute values based on received attribute correction values.

公开(公告)号：US11527018B2

公开(公告)日：2022-12-13

申请号：US17157833

申请日：2021-01-25

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Fabrice A. Robinet ,  Alexandros Tourapis ,  Yeping Su

IPC: G06T9/00 ,  H03M7/30

Abstract: A system comprises an encoder configured to compress attribute information and/or spatial for a point cloud and/or a decoder configured to decompress compressed attribute and/or spatial information for the point cloud. To compress the attribute and/or spatial information, the encoder is configured to convert a point cloud into an image based representation. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud.

公开(公告)号：US20220392115A1

公开(公告)日：2022-12-08

申请号：US17832816

申请日：2022-06-06

Applicant: Apple Inc.

Inventor： Khaled Mammou

IPC: G06T9/00 ,  G06T17/20

Abstract: According to an example method, a system receives first data representing a polygon mesh. The polygon mesh includes a plurality of interconnected vertices forming a plurality of triangles. The system generates second data representing the polygon mesh. Generating the second data includes traversing the vertices of the polygon mesh according to a traversal order, partitioning the plurality of triangles into a set of ordered triangle groups in accordance with the traversal order, and encoding, in the second data, the set of ordered triangle groups. The system outputs the second data. A position each of the vertices in the transversal order is determined based on (i) a number of previously encoded triangles that are incident to that vertex, and/or (ii) a sum of one or more angles formed by the previously encoded triangles that are incident to that vertex.