公开(公告)号：US11711544B2

公开(公告)日：2023-07-25

申请号：US16912617

申请日：2020-06-25

申请人： Apple Inc.

发明人： Alexandros Tourapis ,  Jungsun Kim ,  Khaled Mammou ,  David W. Singer ,  Fabrice A. Robinet

IPC分类号： H04N19/597 ,  H04N19/467 ,  H04N21/81 ,  H04N19/20 ,  G06T7/10

CPC分类号： H04N19/597 ,  G06T7/10 ,  H04N19/20 ,  H04N19/467 ,  H04N21/8193

摘要： 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. Additionally, an encoder is configured to signal and/or a decoder is configured to receive a supplementary message comprising volumetric tiling information that maps portions of 2D image representations to objects in the point. In some embodiments, characteristics of the object may additionally be signaled using the supplementary message or additional supplementary messages.

公开(公告)号：US11647226B2

公开(公告)日：2023-05-09

申请号：US17319019

申请日：2021-05-12

申请人： Apple Inc.

发明人： Jungsun Kim ,  Alexandros Tourapis ,  Khaled Mammou ,  Fabrice A. Robinet ,  Yeping Su ,  David W. Singer

IPC分类号： H04N19/597 ,  H04N19/17 ,  G06T9/00

CPC分类号： H04N19/597 ,  H04N19/17 ,  G06T9/00

摘要： 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. 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, a bit stream structure may be used to communicate compressed point cloud data. The bit stream structure may include point cloud compression network abstraction layer (PCCNAL) units that enable use of groups of frames (GOFs), frame, and sub-frame signaling of patch information. Such a bit stream structure may permit low delay streaming and random access reconstruction of point clouds amongst other applications.

公开(公告)号：US11336913B2

公开(公告)日：2022-05-17

申请号：US16799423

申请日：2020-02-24

申请人： Apple Inc.

发明人： Krishnakanth Rapaka ,  Alexandros Tourapis ,  David W. Singer

IPC分类号： H04N19/503 ,  H04N19/86 ,  H04N19/82

摘要： Predictive coding techniques may include resampling of reference pictures, where various coding parameters are determined based on the resolution(s) or pixel format(s) of the prediction references. In a first aspect, lists of weights for use in weighted prediction are based on the resolution(s) of prediction references. In a second aspect, resampling filter parameters are selected based on the resolutions of prediction references. In a third aspect, deblocking filter parameters are based on the resolution(s) of prediction references.

公开(公告)号：US11202098B2

公开(公告)日：2021-12-14

申请号：US16503933

申请日：2019-07-05

申请人： Apple Inc.

发明人： Khaled Mammou ,  Yeping Su ,  Jungsun Kim ,  Valery G. Valentin ,  David W. Singer ,  Fabrice A. Robinet ,  Hsi-Jung Wu ,  Alexandros Tourapis

IPC分类号： H04N19/597 ,  H04N19/85 ,  H04N19/463

摘要： 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 performs downscaling of an image frame prior to video encoding and a decoder performs upscaling of an image frame subsequent to video decoding.

公开(公告)号：US20210377547A1

公开(公告)日：2021-12-02

申请号：US17404452

申请日：2021-08-17

申请人： Apple Inc.

发明人： Alexandros Tourapis ,  Yeping Su ,  David W. Singer ,  Hsi-Jung Wu

IPC分类号： H04N19/186 ,  H04N19/189 ,  H04N9/64 ,  H04N11/20 ,  H04N19/70 ,  H04N19/46 ,  H04N19/117 ,  H04N19/132 ,  H04N19/154 ,  H04N19/59 ,  H04N9/67 ,  H04N19/82 ,  H04N19/147 ,  H04N19/80 ,  H04N19/85 ,  H04N19/44

摘要： A method of adaptive chroma downsampling is presented. The method comprises converting a source image to a converted image in an output color format, applying a plurality of downsample filters to the converted image and estimating a distortion for each filter chose the filter that produces the minimum distortion. The distortion estimation includes applying an upsample filter, and a pixel is output based on the chosen filter. Methods for closed loop conversions are also presented.

公开(公告)号：US20210266597A1

公开(公告)日：2021-08-26

申请号：US17319019

申请日：2021-05-12

申请人： Apple Inc.

发明人： Jungsun Kim ,  Alexandros Tourapis ,  Khaled Mammou ,  Fabrice A. Robinet ,  Yeping Su ,  David W. Singer

IPC分类号： H04N19/597 ,  H04N19/17

摘要： 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. 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, a bit stream structure may be used to communicate compressed point cloud data. The bit stream structure may include point cloud compression network abstraction layer (PCCNAL) units that enable use of groups of frames (GOFs), frame, and sub-frame signaling of patch information. Such a bit stream structure may permit low delay streaming and random access reconstruction of point clouds amongst other applications.

公开(公告)号：US20210097725A1

公开(公告)日：2021-04-01

申请号：US17119893

申请日：2020-12-11

申请人： Apple Inc.

发明人： Khaled Mammou ,  Yeping Su ,  David W. Singer ,  Alexandros Tourapis ,  Fabrice A. Robinet ,  Hsi-Jung Wu

IPC分类号： G06T9/00 ,  G06K9/62 ,  G06T5/00 ,  G06T19/20 ,  G06T7/00

摘要： 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. A closed-loop color conversion process is used to improve compression while taking into consideration distortion introduced throughout the point cloud compression process.

公开(公告)号：US10757445B2

公开(公告)日：2020-08-25

申请号：US16173105

申请日：2018-10-29

申请人： Apple Inc.

发明人： Alexandros Tourapis ,  David W. Singer ,  Haitao Guo ,  Hsi-Jung Wu ,  Sorin C. Cismas ,  Xiaohua Yang ,  Yeping Su ,  Dazhong Zhang

IPC分类号： H04N19/593 ,  H04N19/156 ,  H04N19/44 ,  H04N19/176 ,  H04N19/182 ,  H04N19/174

摘要： Methods are described for encoding and decoding blocks of image data using intra block copying (IBC). A source block for intra block copying is selected from a source region of a current image that is closer to the current block than a threshold, wherein the source region does not include a portion of the current image that is further from the current block than the threshold.

公开(公告)号：US10715816B2

公开(公告)日：2020-07-14

申请号：US15349989

申请日：2016-11-11

申请人： Apple Inc.

发明人： Alexandros Tourapis ,  David W. Singer ,  Hsi-Jung Wu ,  Yeping Su

IPC分类号： H04N19/154 ,  H04N19/61 ,  H04N19/124 ,  H04N19/13 ,  H04N19/15 ,  H04N19/105 ,  H04N19/51 ,  H04N9/64 ,  H04N1/64 ,  H04N9/67 ,  H04N19/17 ,  H04N19/186

摘要： Techniques for selecting a luminance value for color space conversion are disclosed. Techniques include determining values for Cb and Cr from values for R′, G′, and B′; producing a reconstructed Cb* value and a reconstructed Cr* value by processing the Cb and Cr values; and determining a plurality of Y′ value options from the values for Cb* and Cr*. A Y′ output value may be selected based on the plurality of Y′ value options.

公开(公告)号：US09344720B2

公开(公告)日：2016-05-17

申请号：US13715088

申请日：2012-12-14

申请人： Apple Inc.

发明人： David W. Singer ,  Alexandros Tourapis ,  Athanasios Leontaris ,  Xiaosong Zhou

IPC分类号： H04N11/04 ,  H04N19/13 ,  H04N19/70 ,  H04N19/117 ,  H04N19/174 ,  H04N19/436

CPC分类号： H04N19/13 ,  H04N19/117 ,  H04N19/174 ,  H04N19/436 ,  H04N19/70

摘要： In a communication system, parallel encoding and decoding of serially-coded data occurs in a manner that supports low latency communication. A plurality of data items may be coded as serially-coded data sequences and a transmission sequence may be built from them. An index table may be built having a plurality of entries representing respective start points of the serially-coded data sequences within the transmission sequence. The transmission sequence may be transmitted to a channel and, thereafter, the index table may be transmitted. Latencies otherwise involved in inserting an index table into the beginning of a transmission sequence may be avoided.

摘要翻译： 在通信系统中，串行编码数据的并行编码和解码以支持低延迟通信的方式发生。 多个数据项可以被编码为串行编码数据序列，并且可以从它们构建传输序列。 可以构建索引表，其具有表示传输序列内的串行编码数据序列的相应开始点的多个条目。 发送序列可以被发送到信道，此后可以发送索引表。 可以避免将索引表插入到传输序列的开始处的延迟。