公开(公告)号：US10911787B2

公开(公告)日：2021-02-02

申请号：US16508202

申请日：2019-07-10

Applicant: Apple Inc.

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

IPC: H04N19/91 ,  H04N19/20 ,  H04N19/124 ,  G06T9/00 ,  H04N19/13

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 for the point cloud. To compress the attribute information, multiple levels of detail are generated based on an ordering of the points according to a space filling curve and attribute values are predicted. The attribute values may be predicted simultaneously while points are being assigned to different levels of detail. 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, attribute correction values may take 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：US10909726B2

公开(公告)日：2021-02-02

申请号：US16380928

申请日：2019-04-10

Applicant: Apple Inc.

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

IPC: G06T9/00 ,  G06T17/00

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. In some embodiments, an encoder may be configured to further compress points omitted from the image based representation. Also, in some embodiments, a decoder may be configured to decode points compressed outside of an image based representation or in a separate image based representation.

公开(公告)号：US10904530B2

公开(公告)日：2021-01-26

申请号：US16294258

申请日：2019-03-06

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Guy Cote

IPC: H04N19/124 ,  H04N19/126 ,  H04N19/13 ,  H04N19/136 ,  H04N19/15 ,  H04N19/157 ,  H04N19/159 ,  H04N19/186 ,  H04N19/30 ,  H04N19/51 ,  H04N19/61 ,  H04N19/70 ,  H04N19/86 ,  H04N19/96 ,  H04N19/172 ,  H04N19/176

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：US10897269B2

公开(公告)日：2021-01-19

申请号：US16133674

申请日：2018-09-17

Applicant: Apple Inc.

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

IPC: H03M7/30 ,  H04N19/96 ,  H04N19/436 ,  H04N19/60 ,  H04N19/597

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 for the point cloud. Attribute values for at least one starting point are included in a compressed attribute information file and attribute correction values used to correct predicted attribute values are included in the compressed attribute information file. Attribute values are predicted based, at least in part, on attribute values of neighboring points and distances between a particular point for whom an attribute value is being predicted and the neighboring points. The predicted attribute values are compared to attribute values of a point cloud prior to compression to determine attribute correction values. A decoder follows a similar prediction process as an encoder and corrects predicted values using attribute correction values included in a compressed attribute information file.

公开(公告)号：US20200217937A1

公开(公告)日：2020-07-09

申请号：US16736703

申请日：2020-01-07

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G01S7/4861 ,  G01S17/42

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：US20200111236A1

公开(公告)日：2020-04-09

申请号：US16592711

申请日：2019-10-03

Applicant: Apple Inc.

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

IPC: G06T9/00

Abstract: A system comprises an encoder configured to compress attribute information for a point cloud and/or a decoder configured to decompress compressed attribute 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. Attribute values are predicted based, at least in part, on attribute values of neighboring points. The predicted attribute values are compared to attribute values of a point cloud prior to compression to determine attribute correction values. In order to improve computing efficiency and/or repeatability, fixed-point number representations are used when determining predicted attribute values and attribute correction values. A decoder follows a similar prediction process as an encoder and corrects predicted values using attribute correction values included in a compressed attribute information file using fixed-point number representations.

公开(公告)号：US10602398B2

公开(公告)日：2020-03-24

申请号：US16119900

申请日：2018-08-31

Applicant: Apple Inc.

Inventor： Steven E. Saunders ,  Alexandros Tourapis ,  Krasimir Kolarov

IPC: H04W28/04 ,  H04W52/02 ,  H04L12/26 ,  G06F1/3212 ,  H04N19/85 ,  H04N19/44

Abstract: A method includes sampling a common signal over a plurality of iterations, concatenating the sampled iterations, summing samples of the concatenated iterations within a window of a predetermined sample width, at each of a plurality of window positions along the concatenated iterations, and estimating noise of the common signal from the summed sample values at the window positions.

公开(公告)号：US10462485B2

公开(公告)日：2019-10-29

申请号：US16121501

申请日：2018-09-04

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Fabrice A. Robinet ,  Andrea Cremaschi ,  Alexandros Tourapis

IPC: H04N19/60 ,  H04N19/597 ,  H04N19/59 ,  H04N19/132 ,  H04N19/119 ,  H04N19/182 ,  H04N19/167 ,  G06T17/00

Abstract: A system comprises an encoder configured to compress a point cloud comprising a plurality of points each point comprising spatial information for the point. The encoder is configured to sub-sample the points and determine subdivision locations for the subsampled points. Also, the encoder is configured to determine, for respective subdivision location, if a point is to be included, not included, or relocated relative to the subdivision location. The encoder encodes spatial information for the sub-sampled points and encodes subdivision location point inclusion/relocation information to generate a compressed point cloud. A decoder recreates an original or near replica of an original point cloud based on the spatial information and the subdivision location inclusion/relocation information included in the compressed point cloud.

公开(公告)号：US20190208204A1

公开(公告)日：2019-07-04

申请号：US16294229

申请日：2019-03-06

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Guy Cote

IPC: H04N19/124 ,  H04N19/61 ,  H04N19/159 ,  H04N19/30 ,  H04N19/86 ,  H04N19/157 ,  H04N19/15 ,  H04N19/126 ,  H04N19/136 ,  H04N19/70 ,  H04N19/51 ,  H04N19/13 ,  H04N19/186

CPC classification number: H04N19/124 ,  H04N19/126 ,  H04N19/13 ,  H04N19/136 ,  H04N19/15 ,  H04N19/157 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/186 ,  H04N19/30 ,  H04N19/51 ,  H04N19/61 ,  H04N19/70 ,  H04N19/86 ,  H04N19/96

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：US10298929B2

公开(公告)日：2019-05-21

申请号：US14967320

申请日：2015-12-13

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Guy Cote

IPC: H04N19/124 ,  H04N19/136 ,  H04N19/30 ,  H04N19/70 ,  H04N19/126 ,  H04N19/186 ,  H04N19/157 ,  H04N19/86 ,  H04N19/13 ,  H04N19/15 ,  H04N19/159 ,  H04N19/51 ,  H04N19/61 ,  H04N19/96 ,  H04N19/172 ,  H04N19/176

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.