公开(公告)号：US11659182B2

公开(公告)日：2023-05-23

申请号：US17232539

申请日：2021-04-16

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Guy Cote

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

CPC classification number: 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 ,  H04N19/172 ,  H04N19/176 ,  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：US11562507B2

公开(公告)日：2023-01-24

申请号：US17031787

申请日：2020-09-24

Applicant: Apple Inc.

Inventor： Jungsun Kim ,  Alexandros Tourapis ,  Khaled Mammou ,  Chao Cao ,  Marius Preda

IPC: G06V30/00 ,  G06T9/00 ,  G06T5/00 ,  G06T7/73 ,  H04N19/137 ,  H04N19/80 ,  H04N19/172 ,  H04N19/60

Abstract: 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 generates time-consistent patches for multiple version of the point cloud at multiple moments in time and uses the time-consistent patches to generate image based representations of the point cloud at the multiple moments in time.

公开(公告)号：US11539974B2

公开(公告)日：2022-12-27

申请号：US17493607

申请日：2021-10-04

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Yeping Su ,  David Singer ,  Hsi-Jung Wu

IPC: H04N19/50 ,  H04N19/184 ,  H04N19/167 ,  H04N19/436 ,  H04N19/186 ,  H04N19/132 ,  H04N19/124 ,  H04N19/13 ,  H04N19/15 ,  H04N19/30 ,  H04N19/42 ,  H04N19/48 ,  H04N19/182

Abstract: Video compression and decompression techniques are disclosed that provide improved bandwidth control for video compression and decompression systems. In particular, video coding and decoding techniques quantize input video in multiple dimensions. According to these techniques, pixel residuals may be generated from a comparison of an array of input data to an array of prediction data. The pixel residuals may be quantized in a first dimension. After the quantization, the quantized pixel residuals may be transformed to an array of transform coefficients. The transform coefficients may be quantized in a second dimension and entropy coded. Decoding techniques invert these processes. In still other embodiments, multiple quantizers may be provided upstream of the transform stage, either in parallel or in cascade, which provide greater flexibility to video coders to quantize data in different dimensions in an effort to balance the competing interest in compression efficiency and quality of reconstructed video.

公开(公告)号：US20220408096A1

公开(公告)日：2022-12-22

申请号：US17897079

申请日：2022-08-26

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  David Singer

IPC: H04N19/14 ,  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 ,  H04N19/176 ,  H04N19/182 ,  H04N19/52

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：US20220405533A1

公开(公告)日：2022-12-22

申请号：US17817920

申请日：2022-08-05

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：US20220353543A1

公开(公告)日：2022-11-03

申请号：US17867644

申请日：2022-07-18

Applicant: Apple Inc.

Inventor： Hye-Yeon Cheong ,  David W. Singer ,  Alexandros Tourapis

IPC: H04N19/82 ,  H04N19/107 ,  H04N19/137 ,  H04N19/182 ,  H04N19/186

Abstract: A system comprises an encoder configured to compress video data using an in-loop noise generation process that generates noise in the compression loop at a sub-image portion level of granularity, such as at a block level. The encoder includes noise model and/or noise model input parameter information in an encoded bit stream. Also, a system includes a decoder configured to receive such a bit stream and decompress the video using an in-loop noise generation process that generates noise in the decompression loop at a sub-image portion level of granularity.

公开(公告)号：US11454710B2

公开(公告)日：2022-09-27

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 ,  H03M7/30

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：US11450030B2

公开(公告)日：2022-09-20

申请号：US17030264

申请日：2020-09-23

Applicant: Apple Inc.

Inventor： Khaled Mammou ,  Alexandros Tourapis ,  Jungsun Kim

IPC: G06V20/00 ,  G06T9/00 ,  G06T3/40 ,  G06T5/00 ,  H04N19/20 ,  H04N19/597 ,  H04N19/80 ,  H04N19/172 ,  G06T17/20

Abstract: A system comprises an encoder configured to compress and encode data for a three-dimensional mesh using a video encoding technique. To compress the three-dimensional mesh, the encoder determines sub-meshes and for each sub-mesh: texture patches and geometry patches. Also the encoder determines patch connectivity information and patch texture coordinates for the texture patches and geometry patches. The texture patches and geometry patches are packed into video image frames and encoded using a video codec. Additionally, the encoder determines boundary stitching information for the sub-meshes. A decoder receives a bit stream as generated by the encoder and reconstructs the three-dimensional mesh.

公开(公告)号：US20220279181A1

公开(公告)日：2022-09-01

申请号：US17747368

申请日：2022-05-18

Applicant: Apple Inc.

Inventor： Alexandros Tourapis

IPC: H04N19/12 ,  H04N19/70 ,  H04N19/136 ,  H04N19/17 ,  H04N19/625 ,  H04N19/186

Abstract: An encoder system may include an analyzer that analyzes a current image area in an input video to select a transform. A selectable residue transformer, controlled by the analyzer, may perform the selectable transform on a residue image generated from the current image area and a predicted current image area, to generate a transformed residue image. An encoder may encode the transformed residue image to generate output data. The analyzer controls the encoder to encode information to identify the selectable transform and to indicate that the selectable transform for the current image area is different from a transform of a previous image area of the input video. A decoder system may include components appropriate for decoding the output data from the encoder system.

公开(公告)号：US11386524B2

公开(公告)日：2022-07-12

申请号：US16586872

申请日：2019-09-27

Applicant: Apple Inc.

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

IPC: G06T3/40 ,  G06T5/00 ,  G06T9/00

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. 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, wherein pixel values for the padding are determined based on neighboring pixels values such that the padding is smoothed in the image frame. Also, the decoder is configured to generate a decompressed point cloud based on an image based representation of a point cloud.