公开(公告)号：US20190156520A1

公开(公告)日：2019-05-23

申请号：US16198635

申请日：2018-11-21

Applicant: Apple Inc.

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

IPC: G06T9/00 ,  G06T7/70 ,  G06T7/20 ,  G06T7/50

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. A block/sub-block organization scheme is used to encode blocks and sub-blocks of an occupancy map used in compressing the point cloud. Binary values are assigned to blocks/sub-blocks based on whether they contain patches projected on the point cloud. A traversal path is chosen that takes advantage of run-length encoding strategies to reduce a size of an encoded occupancy map. Also, auxiliary information is used to further improve occupancy map compression.

公开(公告)号：US20190075320A1

公开(公告)日：2019-03-07

申请号：US16121501

申请日：2018-09-04

Applicant: Apple Inc.

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

IPC: H04N19/597 ,  H04N19/59

CPC classification number: H04N19/597 ,  G06T17/00 ,  G06T2210/56 ,  H04N19/119 ,  H04N19/132 ,  H04N19/167 ,  H04N19/182 ,  H04N19/59

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：US20180376369A1

公开(公告)日：2018-12-27

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

CPC classification number: H04W28/04 ,  G06F1/3212 ,  H04L43/16 ,  H04N19/44 ,  H04N19/85 ,  H04W52/0277 ,  Y02D10/174 ,  Y02D70/00

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：US09854246B2

公开(公告)日：2017-12-26

申请号：US14503200

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  David Singer ,  Guy Cote ,  Timothy J. Millet

IPC: H04N19/154 ,  H04N19/103 ,  H04N19/124 ,  H04N19/176 ,  H04N19/196 ,  H04N19/40

CPC classification number: H04N19/154 ,  H04N19/103 ,  H04N19/124 ,  H04N19/176 ,  H04N19/196 ,  H04N19/40

Abstract: Embodiments of the present invention may provide a video coder. The video coder may include an encoder to perform coding operations on a video signal in a first format to generate coded video data, and a decoder to decode the coded video data. The video coder may also include an inverse format converter to convert the decoded video data to second format that is different than the first format and an estimator to generate a distortion metric using the decoded video data in the second format and the video signal in the second format. The encoder may adjust the coding operations based on the distortion metric.

公开(公告)号：US09769480B2

公开(公告)日：2017-09-19

申请号：US14931158

申请日：2015-11-03

Applicant: Apple Inc.

Inventor： Alexandros Tourapis

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

CPC classification number: H04N19/12 ,  H04N19/136 ,  H04N19/17 ,  H04N19/186 ,  H04N19/625 ,  H04N19/70

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：US09300967B2

公开(公告)日：2016-03-29

申请号：US14173676

申请日：2014-02-05

Applicant: Apple Inc.

Inventor： Alexandros Tourapis

IPC: H04N19/00 ,  H04N19/117 ,  H04N19/176 ,  H04N19/70 ,  H04N19/463 ,  H04N19/14 ,  H04N19/82 ,  H04N19/86

CPC classification number: H04N19/117 ,  H04N19/14 ,  H04N19/176 ,  H04N19/463 ,  H04N19/70 ,  H04N19/82 ,  H04N19/86

Abstract: Offset values, such as Sample Adaptive Offset (SAO) values in video coding standards such as the High Efficiency Video Coding standard (HEVC), may be improved by performing calculations and operations that improve the preciseness of these values without materially affecting the signal overhead needed to transmit the more precise values. Such calculations and operations may include applying a quantization factor to a video sample and at least some of its neighbors, comparing the quantized values, and classifying the video sample as a minimum, maximum, or one of various types of edges based on the comparison. Other sample range, offset mode, and/or offset precision parameters may be calculated and transmitted with metadata to improve the precision of offset values.

Abstract translation: 诸如高效率视频编码标准（HEVC）等视频编码标准中的样本自适应偏移（SAO）值的偏移值可以通过执行提高这些值的精确度而不会显着影响所需信号开销的计算和操作来改进 传输更精确的值。 这样的计算和操作可以包括将量化因子应用于视频样本和其邻近的至少一些，比较量化值，并且基于比较将视频样本分类为各种类型的边缘中的最小值，最大值或者其中之一。 可以使用元数据计算并发送其他采样范围，偏移模式和/或偏移精度参数，以提高偏移值的精度。

公开(公告)号：US09270993B2

公开(公告)日：2016-02-23

申请号：US13759851

申请日：2013-02-05

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Athanasios Leontaris

IPC: H04N19/00 ,  H04N19/577 ,  H04N19/159 ,  H04N19/117 ,  H04N19/136 ,  H04N19/82 ,  H04N19/86 ,  H04N19/61 ,  H04N19/103

CPC classification number: H04N19/577 ,  H04N19/103 ,  H04N19/117 ,  H04N19/136 ,  H04N19/159 ,  H04N19/61 ,  H04N19/82 ,  H04N19/86

Abstract: Codecs may be modified to consider weighting and/or illumination compensation parameters when determining a deblocking filter strength that is to be applied. These parameters may be useful for recording illumination changes, such as fades, cross-fades, flashes, or light source changes, which allows these illumination changes to displayed during playback using the same reference frame data which different weighting and/or illumination compensation parameters applied. In different instances, the parameters may be considered when setting a deblocking filter strength to ensure that these effects are properly displaying during playback while minimizing the appearance of blocking artifacts.

Abstract translation: 当确定要应用的去块滤波器强度时，可以修改编解码器以考虑加权和/或照明补偿参数。 这些参数可能用于记录照明变化，例如淡入淡出，交叉淡入淡出，闪烁或光源变化，这允许使用不同的加权和/或照明补偿参数应用的相同参考帧数据在播放期间显示这些照明变化 。 在不同的情况下，当设置去块滤波器强度时可以考虑参数，以确保这些效果在重放期间正确地显示，同时最小化块伪影的外观。

公开(公告)号：US09225988B2

公开(公告)日：2015-12-29

申请号：US13905889

申请日：2013-05-30

Applicant: Apple Inc.

Inventor： Alexandros Tourapis

IPC: G06K9/36 ,  H04N19/12 ,  H04N19/70 ,  H04N19/136 ,  H04N19/17 ,  H04N19/625

CPC classification number: H04N19/12 ,  H04N19/136 ,  H04N19/17 ,  H04N19/186 ,  H04N19/625 ,  H04N19/70

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.

Abstract translation: 编码器系统可以包括分析器，其分析输入视频中的当前图像区域以选择变换。 由分析仪控制的可选择的残留变压器可以对从当前图像区域和预测的当前图像区域产生的残差图像执行可选择的变换，以生成变换的残差图像。 编码器可对经变换的残差图像进行编码以产生输出数据。 分析器控制编码器对信息进行编码以识别可选择的变换，并指示当前图像区域的可选变换与输入视频的先前图像区域的变换不同。 解码器系统可以包括适于对来自编码器系统的输出数据进行解码的组件。

公开(公告)号：US20150249833A1

公开(公告)日：2015-09-03

申请号：US14503200

申请日：2014-09-30

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  David Singer ,  Guy Cote ,  Timothy J. Millet

IPC: H04N19/154 ,  H04N19/124 ,  H04N19/40 ,  H04N19/176 ,  H04N19/103 ,  H04N19/196

CPC classification number: H04N19/154 ,  H04N19/103 ,  H04N19/124 ,  H04N19/176 ,  H04N19/196 ,  H04N19/40

Abstract: Embodiments of the present invention may provide a video coder. The video coder may include an encoder to perform coding operations on a video signal in a first format to generate coded video data, and a decoder to decode the coded video data. The video coder may also include an inverse format converter to convert the decoded video data to second format that is different than the first format and an estimator to generate a distortion metric using the decoded video data in the second format and the video signal in the second format. The encoder may adjust the coding operations based on the distortion metric.

Abstract translation: 本发明的实施例可以提供视频编码器。 视频编码器可以包括编码器，以对第一格式的视频信号执行编码操作，以产生编码的视频数据，以及解码器，对编码的视频数据进行解码。 视频编码器还可以包括逆格式转换器，用于将解码的视频数据转换为与第一格式不同的第二格式，以及估计器，以使用第二格式的解码视频数据和第二格式的视频信号来生成失真度量 格式。 编码器可以基于失真度量来调整编码操作。

公开(公告)号：US20150071345A1

公开(公告)日：2015-03-12

申请号：US14452494

申请日：2014-08-05

Applicant: Apple Inc.

Inventor： Alexandros Tourapis ,  Guy Cote

IPC: H04N19/124

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.

Abstract translation: 提供了一种用于发信号通知量化组特有的附加色度QP偏移值的方法，其中每个量化组明确地指定其自己的色度QP偏移值集合。 或者，在图像的标题区域中指定可能的色度QP偏移值集合的表，并且每个量化组使用索引来从表中选择用于确定其自己的色度QP偏移值集合的条目。 然后，除了已经为视频编码层级的较高级别指定的色度QP偏移值之外，量化组特定色度QP偏移值用于确定量化组内的块的色度QP值。