公开(公告)号：WO2021067867A1

公开(公告)日：2021-04-08

申请号：PCT/US2020/054143

申请日：2020-10-02

Applicant: APPLE INC.

Inventor： MAMMOU, Khaled ,  TOURAPIS, Alexandros ,  FLYNN, David ,  GAO, Zhenzhen

IPC: G06T9/00

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 points to exclude from the search space. 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：WO2021062279A1

公开(公告)日：2021-04-01

申请号：PCT/US2020/052887

申请日：2020-09-25

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros ,  KIM, Jungsun ,  MAMMOU, Khaled ,  TULVAN, Liviu Traian Christian ,  PREDA, Marius

IPC: H04N19/597 ,  H04N19/593 ,  H04N19/147 ,  G06T9/00 ,  H04N19/20

Abstract: A system comprises an encoder configured to compress attribute information for a dynamic point cloud and/or a decoder configured to decompress compressed attribute information for a dynamic point cloud. The dynamic point cloud may include multiple versions of the point cloud at multiple moments in time Attribute values for the point cloud may be compressed at a reference frame using an intra-prediction process and may be compressed at one or more reference frames using an inter-prediction process that takes advantage of temporal relationships between different frames (e.g. versions) of the dynamic point cloud at the different moments in time.

公开(公告)号：WO2021062044A1

公开(公告)日：2021-04-01

申请号：PCT/US2020/052565

申请日：2020-09-24

Applicant: APPLE INC.

Inventor： MAMMOU, Khaled ,  TOURAPIS, Alexandros ,  KIM, Jungsun

IPC: G06T9/00

Abstract: A system comprises an encoder configured to compress and encode data for a three-dimensional mesh using a video encoding technique. To compress the three-dimensional mesh, the encoder determines sub-meshes and for each sub-mesh: texture patches and geometry patches. Also the encoder determines patch connectivity information and patch texture coordinates for the texture patches and geometry patches. The texture patches and geometry patches are packed into video image frames and encoded using a video codec. Additionally, the encoder determines boundary stitching information for the sub-meshes. A decoder receives a bit stream as generated by the encoder and reconstructs the three-dimensional mesh.

公开(公告)号：WO2021061748A1

公开(公告)日：2021-04-01

申请号：PCT/US2020/052182

申请日：2020-09-23

Applicant: APPLE INC.

Inventor： CHEONG, Hye-Yeon ,  SINGER, David, W. ,  TOURAPIS, Alexandros

IPC: H04N19/117 ,  H04N19/136 ,  H04N19/176 ,  H04N19/70 ,  H04N19/82

Abstract: A system comprises an encoder configured to compress video data using an in-loop noise generation process that generates noise in the compression loop at a sub-image portion level of granularity, such as at a block level. The encoder includes noise model and/or noise model input parameter information in an encoded bit stream. Also, a system includes a decoder configured to receive such a bit stream and decompress the video using an in-loop noise generation process that generates noise in the decompression loop at a sub-image portion level of granularity.

公开(公告)号：WO2015035092A3

公开(公告)日：2015-03-12

申请号：PCT/US2014/054152

申请日：2014-09-04

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros ,  COTE, Guy

IPC: H04N19/124 ,  H04N19/30

Abstract: A method of signaling additional chroma QP offset values that are specific to quantization groups is provided, in which each quantization group explicitly specifies its own set of chroma QP offset values. Alternatively, a table of possible sets of chroma QP offset values is specified in the header area of the picture, and each quantization group uses an index to select an entry from the table for determining its own set of chroma QP offset values. The quantization group specific chroma QP offset values are then used to determine the chroma QP values for blocks within the quantization group in addition to chroma QP offset values already specified for higher levels of the video coding hierarchy.

公开(公告)号：WO2021262419A1

公开(公告)日：2021-12-30

申请号：PCT/US2021/035879

申请日：2021-06-04

Applicant: APPLE INC.

Inventor： RAPAKA, Krishnakanth ,  CHON, Jaehong ,  TOURAPIS, Alexandros ,  SINGER, David W.

IPC: H04N19/126 ,  H04N19/157 ,  H04N19/172 ,  H04N19/174 ,  H04N19/176 ,  H04N19/70 ,  H04N19/124 ,  H04N19/186 ,  H04N19/82

Abstract: Improved video coding and decoding techniques are described, including techniques to derive quantization step sizes adaptively with quantization step size table templates. Quantization techniques described provide finer-grained control over quantization with a more flexible quantization step size especially at higher degrees of quantization. This may result in improved overall compression quality. Other coding parameters, such as in-loop filtering parameters, may be derived based on the more flexible quantization parameters.

公开(公告)号：WO2021062274A1

公开(公告)日：2021-04-01

申请号：PCT/US2020/052882

申请日：2020-09-25

Applicant: APPLE INC.

Inventor： KIM, Jungsun ,  TOURAPIS, Alexandros ,  MAMMOU, Khaled ,  CAO, Chao ,  PREDA, Marius

IPC: H04N19/597 ,  G06T9/00 ,  H04N19/17 ,  H04N19/20 ,  H04N19/57

Abstract: A system comprises an encoder configured to compress attribute and/or spatial information 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. In some embodiments, an encoder generates time-consistent patches for multiple version of the point cloud at multiple moments in time and uses the time- consistent patches to generate image based representations of the point cloud at the multiple moments in time.

公开(公告)号：WO2020146547A1

公开(公告)日：2020-07-16

申请号：PCT/US2020/012807

申请日：2020-01-08

Applicant: APPLE INC.

Inventor： TOURAPIS, Alexandros ,  KIM, Jungsun ,  MAMMOU, Khaled

IPC: G06T9/00 ,  G06T17/00 ,  H04N19/463 ,  H04N19/503

Abstract: A system comprises an encoder configured to compress attribute information and/or spatial information for a point cloud. The encoder is configured to convert a point cloud into an image- based representation. Auxiliary information is signaled for use in identifying patches in an image frame. The auxiliary information may be signaled using a syntax that includes a header portion and data portion, which may enable temporal prediction and timing information to be signaled. A decoder is configured to re-construct a 3D representation of the point cloud for respective frames using such signaled information.

公开(公告)号：WO2020146539A1

公开(公告)日：2020-07-16

申请号：PCT/US2020/012794

申请日：2020-01-08

Applicant: APPLE INC.

Inventor： MAMMOU, Khaled ,  TOURAPIS, Alexandros ,  KIM, Jungsun

IPC: G06T9/00 ,  H03M7/30 ,  H04N19/593

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：WO2020112321A2

公开(公告)日：2020-06-04

申请号：PCT/US2019/060238

申请日：2019-11-07

Applicant: APPLE INC.

Inventor： YANG, Xiaohua ,  TOURAPIS, Alexandros ,  ZHANG, Dazhong ,  YUAN, Hang ,  WU, Hsi-Jung ,  KIM, Jae Hoon ,  ZHAI, Jiefu ,  CHEN, Ming ,  ZHOU, Xiaosong

IPC: H04N21/81 ,  H04N21/4728 ,  H04N21/6587 ,  H04N21/63 ,  H04N21/2343 ,  H04N21/84 ,  H04N21/845 ,  H04N21/442 ,  H04N19/00

Abstract: In communication applications, aggregate source image data at a transmitter exceeds the data that is needed to display a rendering of a viewport at a receiver. Improved streaming techniques that include estimating a location of a viewport at a future time. According to such techniques, the viewport may represent a portion of an image from a multi-directional video to be displayed at the future time, and tile(s) of the image may be identified in which the viewport is estimated to be located. In these techniques, the image data of tile(s) in which the viewport is estimated to be located may be requested at a first service tier, and the other tile in which the viewport is not estimated to be located may be requested at a second service tier, lower than the first service tier.