公开(公告)号：US11508095B2

公开(公告)日：2022-11-22

申请号：US17163194

申请日：2021-01-29

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim ,  Fabrice A. Robinet ,  Valery G. Valentin ,  Yeping Su

IPC: G06T9/00 ,  G06T17/00

Abstract: A system comprises an encoder configured to compress attribute information for a point cloud and/or a decoder configured to decompress compressed attribute for the point cloud. To compress the attribute information, multiple levels of detail are generated based on spatial information. Also, attribute values are predicted based on the level of details. A decoder follows a similar prediction process based on level of details. Also, attribute correction values may be determined to correct predicted attribute values and may be used by a decoder to decompress a point cloud compressed using level of detail attribute compression. In some embodiments, an update operation is performed to smooth attribute correction values taking into account an influence factor of respective points in a given level of detail on attributes in other levels of detail.

公开(公告)号：US20220360814A1

公开(公告)日：2022-11-10

申请号：US17736881

申请日：2022-05-04

Applicant: Apple Inc.

Inventor： Yeqing Wu ,  Alexandros Tourapis ,  Yunfei Zheng ,  Hsi-Jung Wu ,  Jun Xin ,  Albert E. Keinath ,  Mei Guo ,  Alican Nalci

IPC: H04N19/52 ,  H04N19/176 ,  H04N19/105 ,  H04N19/159 ,  H04N19/124

Abstract: An encoder or decoder can perform enhanced motion vector prediction by receiving an input block of data for encoding or decoding and accessing stored motion information for at least one other block of data. Based on the stored motion information, the encoder or decoder can generate a list of one or more motion vector predictor candidates for the input block in accordance with an adaptive list construction order. The encoder or decoder can predict a motion vector for the input block based on at least one of the one or more motion vector predictor candidates.

公开(公告)号：US20220360280A1

公开(公告)日：2022-11-10

申请号：US17814487

申请日：2022-07-22

Applicant: Apple Inc.

Inventor： David Flynn ,  Alexandros Tourapis ,  Khaled Mammou

IPC: H03M7/40

Abstract: A system comprises an encoder configured to entropy encode a bitstream comprising both compressible and non-compressible symbols. The encoder parses the bitstream into a compressible symbol sub-stream and a non-compressible sub-stream. The non-compressible symbol sub-stream bypass an entropy encoding component of the encoder while the compressible symbol sub-stream is entropy encoded. When a quantity of bytes of entropy encoded symbols and bypass symbols is accumulated a chunk of fixed or known size is formed using the accumulated entropy encoded symbol bytes and the bypass bytes without waiting on the full bitstream to be processed by the encoder. In a complementary manner, a decoder reconstructs the bitstream from the packets or chunks.

公开(公告)号：US11494947B2

公开(公告)日：2022-11-08

申请号：US17119938

申请日：2020-12-11

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Yeping Su ,  Alexandros Tourapis ,  Jungsun Kim ,  Valery G. Valentin ,  Fabrice A. Robinet

IPC: G06T9/00 ,  G06T17/00 ,  G06F16/901 ,  G01S17/89

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. A point cloud attribute transfer algorithm may be used to determine distortion between an original point cloud and a reconstructed point cloud. Additionally, the point cloud attribute transfer algorithm may be used to select attribute values for a reconstructed point cloud such that distortion between an original point cloud and a reconstructed version of the original point cloud is minimized.

公开(公告)号：US11477483B2

公开(公告)日：2022-10-18

申请号：US17145192

申请日：2021-01-08

Applicant: Apple Inc.

Inventor： Jungsun Kim ,  Khaled Mammou ,  Alexandros Tourapis

IPC: H04N19/597 ,  H04N19/124 ,  H04N19/30 ,  H04N19/46

Abstract: A system comprises an encoder configured to compress attribute information and/or spatial information for volumetric visual content and/or a decoder configured to decompress compressed attribute and/or spatial information for the volumetric visual content. The encoder is configured to convert a 3D representation of the visual volumetric content into a 2D image based representation. The encoder is further configured to scale the patch in 2D space independent of any scaling in 3D space. Auxiliary information is signaled for use in identifying 2D scaled or unscaled patches in an image frame, mapping the patches into 3D space, and adjusting for any scaling factors applied at the encoder.

公开(公告)号：US20220292722A1

公开(公告)日：2022-09-15

申请号：US17804477

申请日：2022-05-27

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Yeping Su ,  Jungsun Kim ,  Fabrice A. Robinet ,  Valery G. Valentin

IPC: G06T9/00 ,  H04N19/597

Abstract: A system comprises an encoder configured to compress attribute information 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. The encoder is configured to convert a point cloud into an image based representation. The encoder packs patch images into an image frame and fills empty spaces in the image frame with a padding. Various compression strategies may be used to encode an occupancy map and related block-to-patch information indicating which portions of the image frame correspond to which packed patches. Packed image frames comprising patches and padding, along with an encoded occupancy map and related block-to-patch information are sent to a decoder. The decoder is configured to generate a decompressed point cloud based on the packed image frames, compressed occupancy map, and related block-to-patch information.

公开(公告)号：US11445202B2

公开(公告)日：2022-09-13

申请号：US17073263

申请日：2020-10-16

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  David Singer

IPC: H04N19/14 ,  H04N19/52 ,  H04N19/176 ,  H04N19/182 ,  G06F3/14 ,  G09G5/02 ,  G09G5/10 ,  H04N1/64 ,  H04N5/20 ,  H04N5/235 ,  H04N19/172 ,  H04N19/102 ,  H04N19/137 ,  H04N19/177 ,  H04N19/124 ,  H04N19/154 ,  H04N19/17 ,  H04N19/98 ,  H04N21/422 ,  H04N21/431 ,  G06T5/00 ,  G09G3/20 ,  G09G5/00 ,  H04N1/60 ,  H04N5/50 ,  H04N9/64 ,  H04N9/67 ,  H04N19/136 ,  H04N19/184 ,  H04N19/186 ,  H04N19/169 ,  H04N19/44 ,  H04N19/30 ,  H04N19/33 ,  H04N19/86 ,  H04N19/463 ,  H04N21/4223 ,  H04N21/44 ,  H04N21/4402 ,  H04N21/442 ,  H04N21/485

Abstract: A video encoding and decoding system that implements an adaptive transfer function method internally within the codec for signal representation. A focus dynamic range representing an effective dynamic range of the human visual system may be dynamically determined for each scene, sequence, frame, or region of input video. The video data may be cropped and quantized into the bit depth of the codec according to a transfer function for encoding within the codec. The transfer function may be the same as the transfer function of the input video data or may be a transfer function internal to the codec. The encoded video data may be decoded and expanded into the dynamic range of display(s). The adaptive transfer function method enables the codec to use fewer bits for the internal representation of the signal while still representing the entire dynamic range of the signal in output.

公开(公告)号：US11430155B2

公开(公告)日：2022-08-30

申请号：US16593994

申请日：2019-10-05

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Fabrice A. Robinet ,  Jungsun Kim ,  Khaled Mammou ,  Valery G. Valentin ,  Yeping Su

IPC: G06T9/00 ,  H04N19/597

Abstract: A system comprises an encoder configured to compress attribute information 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. The encoder is configured to convert a point cloud into an image based representation. The encoder packs patch images into an image frame and fills empty spaces in the image frame with a padding. The encoder is also configured to determine quantized minimum depths and/or maximum depths patch images in the image frames, wherein depth information is signaled relative to the quantized minimum depth.

公开(公告)号：US11409998B2

公开(公告)日：2022-08-09

申请号：US17061460

申请日：2020-10-01

Applicant: Apple Inc.

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

IPC: G06K9/62 ,  G06T7/70 ,  G06T11/20

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：US11388419B2

公开(公告)日：2022-07-12

申请号：US16834693

申请日：2020-03-30

Applicant: Apple Inc.

Inventor： Mei Guo ,  Jun Xin ,  Hsi-Jung Wu ,  Alexandros Tourapis ,  Krishnakanth Rapaka

IPC: H04N19/159 ,  H04N19/182 ,  H04N19/176

Abstract: Improved video coding techniques include deriving prediction pixel blocks for use in intra-coding video and combined inter- and intra-coding video. In a first aspect, the techniques may include deriving value(s) for pixel location(s) of the prediction pixel block by, when a prediction direction vector assigned to the prediction vector points to quadrants I or III of a Cartesian plane, deriving the pixel location's value from pixel values in two regions of previously-decoded pixel data intercepted by extending the prediction direction vector in two opposite directions through the pixel location. When the prediction direction vector points toward quadrants II of the Cartesian plane, deriving the pixel location's value from pixel values in one region intercepted by the prediction direction vector through the pixel location, and from a second region intercepted by a vector that is orthogonal to the prediction direction vector.