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公开(公告)号：US20240005560A1
公开(公告)日：2024-01-04
申请号：US18225704
申请日：2023-07-25
IPC分类号： G06T9/00
CPC分类号： G06T9/001
摘要： At least one embodiment relates to a method comprising encoding a projection mode associated with an image region of a first depth image, said projection mode indicating if said image region stores either the minimum or the maximum depth value of at least one orthogonally projected 3D point of the point cloud along a same projection direction; and encoding said depth minimum and maximum depth values as a function of said projection mode.
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公开(公告)号：US11863739B2
公开(公告)日：2024-01-02
申请号：US17838693
申请日：2022-06-13
发明人： Fabien Racape , Franck Galpin , Tangi Poirier
IPC分类号： H04N19/11 , H04N19/132 , H04N19/159 , H04N19/105 , H04N19/176 , H04N19/593 , H04N19/182
CPC分类号： H04N19/105 , H04N19/11 , H04N19/132 , H04N19/159 , H04N19/176 , H04N19/182 , H04N19/593
摘要： The method for intra frame prediction allows for the recovery of some intra directional modes that are otherwise rendered useless due to the classical padding process. Directional modes are recovered by filling pixel locations in the prediction unit with samples from the portion of the unit that is determined to have samples available for use using a counterpart directional mode to the one that is useless. When it is determined that reference samples are missing for a particular prediction unit or portion thereof given a particular directional mode, a determination is made about whether reference samples along another portion of the prediction unit are available. The other portion is the side of the prediction unit at an opposite end of the particular directional mode. When it is determined that such reference samples are available, it is possible to extend the number of intra directional modes by replacing the particular directional modes that are rendered useless, because of the unavailability of reference samples, with their counterpart directional modes that are oppositely directed.
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公开(公告)号：US20230412810A1
公开(公告)日：2023-12-21
申请号：US18229987
申请日：2023-08-03
IPC分类号： H04N19/129 , H04N19/119 , H04N19/593 , H04N19/159 , H04N19/176
CPC分类号： H04N19/129 , H04N19/119 , H04N19/176 , H04N19/159 , H04N19/593
摘要： Video encoding and decoding using non-rectangular partitioning. An example video decoding method includes: obtaining information identifying a non-rectangular first partitioning of a current block into a plurality of prediction units; determining a second partitioning of the current block into a plurality of transform units, wherein each transform unit is completely spatially contained within a respective one of the prediction units; and decoding the current block according to the non-rectangular first partitioning and the second partitioning. In some embodiments, the scan order of the transform units is determined such that all transform units contained in a same one of the prediction units are scanned before starting to scan transform units that are contained in a different one of the prediction units.
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公开(公告)号：US20230396767A1
公开(公告)日：2023-12-07
申请号：US18236101
申请日：2023-08-21
IPC分类号： H04N19/124 , H04N19/176 , H04N19/18 , H04N19/91
CPC分类号： H04N19/124 , H04N19/176 , H04N19/18 , H04N19/91 , H04N19/42
摘要： When dependent scalar quantization is used, the choice of the quantizer depends on the decoding of the preceding transform coefficient, and the entropy decoding of a transform coefficient depends on quantizer choice. To maintain high throughput in hardware implementations for transform coefficient entropy coding, several decision schemes of the scaler quantizer are proposed. In one implementation, the state transition and the context model selection are based on only regular coded bins. For example, the state transition can be based on the sum of the SIG, gt1 and gt2 flags, the exclusive-or function of the SIG, gt1 and gt2 flags, or based on only the gt1 or gt2 flag. When a block of transform coefficients is coded, the regular mode bins can be coded first in one or more scan passes, and the remaining bypass coded bins are grouped together in another one or more scan passes.
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公开(公告)号：US20230370645A1
公开(公告)日：2023-11-16
申请号：US18226875
申请日：2023-07-27
发明人： Fabien RACAPE , Philippe BORDES , Edouard FRANCOIS
IPC分类号： H04N19/82 , H04N19/117 , H04N19/167 , H04N19/176 , H04N19/196 , H04N19/70
CPC分类号： H04N19/82 , H04N19/117 , H04N19/167 , H04N19/176 , H04N19/196 , H04N19/70
摘要： Methods and apparatus for performing in-loop filtering in an encoder or a decoder provide regions which use a common set of filter parameters An index can be sent from an encoder to a decoder indicating which set of filter parameters is to be used for a particular region. The in-loop filter can be Sample Adaptive Offset, Adaptive Loop Filter, or any other such filter. An encoder classifies regions of a picture according to blocks using a common set of filter parameter. The classification can be in the form of a map. Filtering blocks use the common set of filter parameters for a region. A decoder parses a bitstream for a set of filter parameters and an index indicative of the filter parameter set for a region being decoded.
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公开(公告)号：US20230300351A1
公开(公告)日：2023-09-21
申请号：US17434152
申请日：2020-02-25
IPC分类号： H04N19/186 , H04N19/176 , H04N19/119
CPC分类号： H04N19/186 , H04N19/176 , H04N19/119
摘要： A cross-component dependent tool to be used for a chroma block of a picture is enabled responsive to a size of said chroma block and to a size of at least one luma block co-located with the chroma block. Then, the chroma block is decoded responsive to said enablement of said cross-component dependent tool. A encoding and decoding methods are presented as well as encoding and decoding devices.
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27.发明授权公开(公告)号：US11765397B2
公开(公告)日：2023-09-19
申请号：US16754028
申请日：2018-10-03
发明人： Julien Ricard , Sebastien Lasserre , Celine Guede
IPC分类号： H04N19/96 , H04N19/147 , H04N19/186 , G06T9/40
CPC分类号： H04N19/96 , G06T9/40 , H04N19/147 , H04N19/186
摘要： The present principles a method and a device for encoding the colors of a point cloud (IPC) representing a 3D object. The method is characterized in that the method comprises: —obtaining (210) a set of points (SP) approximating the geometry of said point cloud (IPC); —encoding (220) a color information data indicating that the color of at least one of the point of said set of points is encoded in a bitstream and that the colors of the other points of said set of points are not encoded in the bitstream. The present principles also relates to a method and a device for decoding the colors of a point cloud.
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公开(公告)号：US20230291922A1
公开(公告)日：2023-09-14
申请号：US18198886
申请日：2023-05-18
发明人： Fabrice Leleannec , Tangi Poirier , Ya Chen
IPC分类号： H04N19/44 , H04N19/60 , H04N19/70 , H04N19/176
CPC分类号： H04N19/44 , H04N19/176 , H04N19/60 , H04N19/70
摘要： A decoding method is disclosed. First, context for a syntax clement associated with a current transform coefficient of a block of a picture is determined. The context is determined based on the area of said block, on the position of the current transform coefficient within the block and on the number of non-zero neighboring transform coefficients in a local template. Second, the syntax element is decoded based at least on the determined context. Advantageously, the local template depends on the shape of said block.
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公开(公告)号：US11758197B2
公开(公告)日：2023-09-12
申请号：US17258821
申请日：2019-07-10
发明人： Fabien Racape , Philippe Bordes , Edouard Francois
IPC分类号： H04N19/82 , H04N19/117 , H04N19/167 , H04N19/176 , H04N19/196 , H04N19/70
CPC分类号： H04N19/82 , H04N19/117 , H04N19/167 , H04N19/176 , H04N19/196 , H04N19/70
摘要： Methods and apparatus for performing in-loop filtering in an encoder or a decoder provide regions which use a common set of filter parameters An index can be sent from an encoder to a decoder indicating which set of filter parameters is to be used for a particular region. The in-loop filter can be Sample Adaptive Offset, Adaptive Loop Filter, or any other such filter. An encoder classifies regions of a picture according to blocks using a common set of filter parameter. The classification can be in the form of a map. Filtering blocks use the common set of filter parameters for a region. A decoder parses a bitstream for a set of filter parameters and an index indicative of the filter parameter set for a region being decoded.
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公开(公告)号：US11727548B2
公开(公告)日：2023-08-15
申请号：US16784124
申请日：2020-02-06
IPC分类号： C10G5/00 , C10G45/58 , C10G2/00 , C10G47/00 , C10G49/00 , C10G67/00 , G06T5/00 , G06T5/40 , H04N19/147 , H04N19/186 , H04N19/30 , H04N19/117 , H04N19/126 , H04N19/184 , H04N19/44 , H04N19/91
CPC分类号： G06T5/009 , G06T5/40 , H04N19/117 , H04N19/126 , H04N19/147 , H04N19/184 , H04N19/186 , H04N19/30 , H04N19/44 , H04N19/91 , G06T2207/10024 , G06T2207/20208
摘要： To encode High Dynamic Range (HDR) images, the HDR images can be converted to Low Dynamic Range (LDR) images through tone mapping operation, and the LDR images can be encoded with an LDR encoder. The present principles formulates a rate distortion minimization problem when designing the tone mapping curve. In particular, the tone mapping curve is formulated as a function of the probability distribution function of the HDR images to be encoded and a Lagrangian multiplier that depends on encoding parameters. At the decoder, based on the parameters indicative of the tone mapping function, an inverse tone mapping function can be derived to reconstruct HDR images from decoded LDR images.
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