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1. 发明申请

WO2021142362A1 IN-TREE GEOMETRY QUANTIZATION OF POINT CLOUDS 审中-公开
公开(公告)号：WO2021142362A1
公开(公告)日：2021-07-15
申请号：PCT/US2021/012828
申请日：2021-01-08
申请人： APPLE INC. , FLYNN, David , MAMMOU, Khaled , ROBINET, Fabrice A.
发明人： FLYNN, David , MAMMOU, Khaled , ROBINET, Fabrice A.
IPC分类号： G06T9/00 , H04N19/124 , H04N19/136 , H04N19/96 , G06T9/40 , G06T9/001 , H04N19/119 , H04N19/167 , H04N19/182 , H04N19/597
摘要： An example device includes one or more processors, and memory storing instructions that when executed by the processors, cause the processors to receive points that represent a point cloud in three-dimensional space, and generate a data structure representing the point cloud. Generating the data structure includes encoding a position of each point in each dimension as a sequence of bits according to a tree data structure; partitioning each of the sequences into two or more portions according to a scaling depth; determining that a subset of the points is spatially isolated from a remainder of the points; quantizing each of the portions associated with the subset of the points according to a first quantization step size; quantizing each of the portions associated with the remainder of the points according to a second quantization step size; and including the quantized portions in the data structure.

2. 发明申请

WO2021142361A1 IN-TREE GEOMETRY QUANTIZATION OF POINT CLOUDS 审中-公开
公开(公告)号：WO2021142361A1
公开(公告)日：2021-07-15
申请号：PCT/US2021/012827
申请日：2021-01-08
申请人： APPLE INC. , FLYNN, David , MAMMOU, Khaled , ROBINET, Fabrice A.
发明人： FLYNN, David , MAMMOU, Khaled , ROBINET, Fabrice A.
IPC分类号： G06T9/40 , H04N19/96 , G06T9/001 , H04N19/126 , H04N19/174 , H04N19/597 , H04N19/70
摘要： An example method includes receiving (502) a plurality of points that represent a point cloud; representing a position of the point in each dimension of a three-dimensional space as a sequence of bits (504), where the position of the point is encoded according to a tree data structure; partitioning (506) at least one of the sequences of bits into a first portion of bits and a second portion of bits; quantizing (508) each of the second portions of bits according to a quantization step size, where the quantization step size is determined according to an exponential function having a quantization parameter value as an input and the quantization step size as an output; and generating (510) a data structure representing the point cloud and including the quantized second portions of bits.

3. 发明申请

WO2012001070A2 PROCÉDÉ DE COMPRESSION / DÉCOMPRESSION DE MAILLAGE TRIDIMENTIONNEL 审中-公开
标题翻译：压缩/分解三维网的方法
公开(公告)号：WO2012001070A2
公开(公告)日：2012-01-05
申请号：PCT/EP2011/060945
申请日：2011-06-29
申请人： FITTINGBOX , MAMMOU, Khaled , DEHAIS, Christophe
发明人： MAMMOU, Khaled , DEHAIS, Christophe
IPC分类号： G06T9/00 , G06T17/20 , H04N7/26
CPC分类号： G06T9/004 , G06T9/001
摘要： Le procédé de codage / décodage de maillage tridimensionnel de points ou sommets connectés sous forme de facettes, délimitées par des arêtes, le maillage M étant défini par des données de connectivité T et des données de géométrie G, comporte : -une étape de codage sans perte des données de connectivité T, en information de connectivité encodée Tc, -une étape de génération itérative d'une hiérarchie de maillage progressif, c'est-à-dire un ensemble de maillages de niveaux de détail progressifs, PM(M*). Il comporte en outre une étape de génération d'une approximation lisse par morceaux M*du maillage original M à partir de la connectivité T du maillage, cette approximation lisse M*étant décrite par : a. l'information de connectivité encodée Tc, b. un petit nombre N de points de contrôle et c. un ensemble d'indices S d'arêtes dites arêtes saillantes du maillage M, préalablement identifiées, -la hiérarchie progressive de maillage, PM(M*)étant utilisée pour calculer une prédiction des erreurs d'approximation de M*par rapport au maillage original M.
摘要翻译：本发明涉及一种用于编码/解码由边缘划分的小面形式连接的点或顶点的三维网格，网格M由连接数据T和几何数据G定义，其中该方法包括：步骤将连通性数据T无损编码为编码连接信息Tc; 迭代地生成渐进网格层次PM（M *）的步骤，即具有逐渐更高级别的细节的一组网格。该方法还包括从网格的连通性T生成原始网格M的片段M *的平滑逼近的步骤，所述平滑近似M *由以下描述：a）编码的连接性信息Tc; b）少数N个监控点; 以及c）所述网M的先前识别的边缘（称为突出边缘）的索引S; 其中逐行网格分层PM（M *）用于计算M *相对于原始网格M的近似误差的预测。

4. 发明申请

WO2021067866A1 LOW-LATENCY ENCODING USING A BYPASS SUB-STREAM AND AN ENTROPY ENCODED SUB-STREAM 审中-公开
公开(公告)号：WO2021067866A1
公开(公告)日：2021-04-08
申请号：PCT/US2020/054142
申请日：2020-10-02
申请人： APPLE INC.
发明人： FLYNN, David , TOURAPIS, Alexandros , MAMMOU, Khaled
IPC分类号： H04N19/91
摘要： 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.

5. 发明申请

WO2021062289A1 VIDEO-BASED POINT CLOUD COMPRESSION WITH NON-NORMATIVE SMOOTHING 审中-公开
公开(公告)号：WO2021062289A1
公开(公告)日：2021-04-01
申请号：PCT/US2020/052900
申请日：2020-09-25
申请人： APPLE INC.
发明人： TOURAPIS, Alexandros , KIM, Jungsun , MAMMOU, Khaled , MEHLEM, Dominik
IPC分类号： H04N19/597 , H04N19/80
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 applies an attribute transfer function to attributes of an image based representation with out-of-loop smoothing such that a decoder may apply any smoothing filter supported by the decoder without being restricted to using a similar smoothing filter as the encoder.

6. 发明申请

WO2023039507A1 ENCODING AND DECODING VISUAL CONTENT INCLUDING POLYGONAL MESHES 审中-公开
公开(公告)号：WO2023039507A1
公开(公告)日：2023-03-16
申请号：PCT/US2022/076168
申请日：2022-09-09
申请人： APPLE INC.
发明人： MAMMOU, Khaled , TOURAPIS, Alexandros , CACHELIN, Arnold H. , FLYNN, David , ROBINET, Fabrice A. , KIM, Jungsun
IPC分类号： G06T9/00 , G06T17/20
摘要： 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.

7. 发明申请

WO2021003229A1 POINT CLOUD COMPRESSION WITH SUPPLEMENTAL INFORMATION MESSAGES 审中-公开
公开(公告)号：WO2021003229A1
公开(公告)日：2021-01-07
申请号：PCT/US2020/040438
申请日：2020-07-01
申请人： APPLE INC.
发明人： TOURAPIS, Alexandros , KIM, Jungsun , MAMMOU, Khaled , SINGER, David W. , ROBINET, Fabrice A.
IPC分类号： H04N19/00 , H04N19/20 , G06T9/00
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. 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.

8. 发明申请

WO2019055963A1 POINT CLOUD COMPRESSION 审中-公开
公开(公告)号：WO2019055963A1
公开(公告)日：2019-03-21
申请号：PCT/US2018/051448
申请日：2018-09-18
申请人： APPLE INC.
发明人： MAMMOU, Khaled , ROBINET, Fabrice A. , TOURAPIS, Alexandros , SU, Yeping
IPC分类号： G06T17/00 , H03M7/30
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.

9. 发明申请

WO2021207431A1 IMPROVED PREDICTIVE CODING FOR POINT CLOUD COMPRESSION 审中-公开
公开(公告)号：WO2021207431A1
公开(公告)日：2021-10-14
申请号：PCT/US2021/026282
申请日：2021-04-07
申请人： APPLE INC.
发明人： MAMMOU, Khaled , FLYNN, David , TOURAPIS, Alexandros
IPC分类号： H04N19/597 , H04N19/96
摘要： A system receives encoded data regarding a points in a point cloud. The data includes a prediction tree having a nodes generated based on spatial information regarding the points and properties of a sensor system that obtained the spatial information. A value of each node represents first spatial coordinates of a respective one of the points according to a first coordinate system, and the value of at least a first node in the prediction tree is determined based on ancestor nodes of the first node and the properties of the sensor system. The system decodes the data to determine first data, including the first spatial coordinates of at least some of the points, and quantization parameters associated with the first spatial coordinates. The system determines second data based on the first data, including second spatial coordinates of at least some of the points according to a second coordinate system.

10. 发明申请

WO2021067884A1 BLOCK-BASED PREDICTIVE CODING FOR POINT CLOUD COMPRESSION 审中-公开
公开(公告)号：WO2021067884A1
公开(公告)日：2021-04-08
申请号：PCT/US2020/054168
申请日：2020-10-03
申请人： APPLE INC.
发明人： MAMMOU, Khaled , FLYNN, David , TOURAPIS, Alexandros , KIM, Jungsun
IPC分类号： H04N19/11 , H04N19/119 , H04N19/12 , H04N19/124 , H04N19/593 , H04N19/597 , G06T9/00
摘要： An encoder is configured to compress point cloud information using a blocks of nodes determined from a prediction tree. A prediction tree is generated for a point cloud. Segments of the prediction tree are identified. The segments are divided into blocks that are predicted by predecessor blocks within the segments. The blocks of the prediction tree may then be encoded and may be provided for transmission to a decoder that can regenerate the point cloud from the blocks of the prediction tree.

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