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    CHROMA QUANTIZATION IN VIDEO CODING
    102.
    发明申请
    CHROMA QUANTIZATION IN VIDEO CODING 审中-公开
    视频编码中的色谱定量

    公开(公告)号：US20170078667A1

    公开(公告)日：2017-03-16

    申请号：US15342128

    申请日：2016-11-03

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Guy Cote

    IPC: H04N19/124 ,  H04N19/61 ,  H04N19/51 ,  H04N19/86 ,  H04N19/159 ,  H04N19/13 ,  H04N19/15

    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。

    METADATA HINTS TO SUPPORT BEST EFFORT DECODING FOR GREEN MPEG APPLICATIONS
    103.
    发明申请
    METADATA HINTS TO SUPPORT BEST EFFORT DECODING FOR GREEN MPEG APPLICATIONS 审中-公开
    元数据提示支持绿色MPEG应用程序的最佳效果解码

    公开(公告)号：US20160105675A1

    公开(公告)日：2016-04-14

    申请号：US14687316

    申请日：2015-04-15

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  David W. Singer ,  Krasimir D. Kolarov ,  Steven E. Saunders ,  Guy Cote ,  Sorin Cismas

    IPC: H04N19/156 ,  H04N19/172 ,  H04N19/105 ,  H04N19/154

    CPC classification number: H04N19/156 ,  H04N19/105 ,  H04N19/12 ,  H04N19/147 ,  H04N19/154 ,  H04N19/172 ,  H04N19/196 ,  H04N19/44 ,  H04N19/46

    Abstract: In a coding system, an encoder codes video data according to a predetermined protocol, which, when decoded causes an associated decoder to perform a predetermined sequence of decoding operations. The encoder may perform local decodes of the coded video data, both in the manner dictated by the coding protocol that is at work and also by one or more alternative decoding operations. The encoder may estimate relative performance of the alternative decoding operations as compared to a decoding operation that is mandated by the coding protocol. The encoder may provide identifiers in metadata that is associated with the coded video data to identify such levels of distortion and/or levels of resources conserved. A decoder may refer to such identifiers when determining when to engage alternative decoding operations as may be warranted under resource conservation policies.

    Abstract translation: 在编码系统中，编码器根据预定的协议对视频数据进行编码，当预定协议被解码时，相关解码器执行预定的解码操作序列。 编码器可以以由正在工作的编码协议所指定的方式以及通过一个或多个替代解码操作来执行编码视频数据的本地解码。 与由编码协议强制的解码操作相比，编码器可以估计替代解码操作的相对性能。 编码器可以提供与编码的视频数据相关联的元数据中的标识符，以识别所保存的资源的失真和/或资源级别。 当确定什么时候参与在资源节约策略下可能需要的替代解码操作时，解码器可以参考这样的标识符。

    Adaptive color space transform coding
    105.
    发明授权
    Adaptive color space transform coding 有权

    公开(公告)号：US09225991B2

    公开(公告)日：2015-12-29

    申请号：US13940025

    申请日：2013-07-11

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis

    IPC: G06K9/36 ,  H04N19/46 ,  H04N19/122 ,  H04N19/186 ,  H04N19/196 ,  H04N1/64

    CPC classification number: H04N19/46 ,  H04N1/64 ,  H04N19/122 ,  H04N19/186 ,  H04N19/198

    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.

    Smoothed directional and DC intra prediction
    106.
    发明授权
    Smoothed directional and DC intra prediction 有权

    公开(公告)号：US12267506B2

    公开(公告)日：2025-04-01

    申请号：US17837846

    申请日：2022-06-10

    Applicant: Apple Inc.

    Inventor： Mei Guo ,  Jun Xin ,  Hsi-Jung Wu ,  Alexandros Tourapis ,  Krishnakanth Rapaka

    IPC: H04N19/159 ,  H04N19/176 ,  H04N19/182

    Abstract: Techniques are disclosed for deriving prediction pixel blocks for use in intra-coding video and combined inter- and intra-coding video. In a first aspect, the techniques may include deriving value(s) for pixel location(s) of the prediction pixel block by, when a prediction direction vector assigned to the prediction vector points to quadrants I or III of a Cartesian plane, deriving the pixel location's value from pixel values in two regions of previously-decoded pixel data intercepted by extending the prediction direction vector in two opposite directions through the pixel location. When the prediction direction vector points toward quadrants II of the Cartesian plane, deriving the pixel location's value from pixel values in one region intercepted by the prediction direction vector through the pixel location, and from a second region intercepted by a vector that is orthogonal to the prediction direction vector.

    QUANTIZED DEPTHS FOR PROJECTION POINT CLOUD COMPRESSION
    108.
    发明申请
    QUANTIZED DEPTHS FOR PROJECTION POINT CLOUD COMPRESSION 有权

    公开(公告)号：US20250054197A1

    公开(公告)日：2025-02-13

    申请号：US18806983

    申请日：2024-08-16

    Applicant: Apple Inc.

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

    IPC: G06T9/00 ,  H04N19/597

    Abstract: 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. 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. The encoder is also configured to determine quantized minimum depths and/or maximum depths patch images in the image frames, wherein depth information is signaled relative to the quantized minimum depth.

    Point Cloud Attribute Transfer Algorithm
    110.
    发明申请
    Point Cloud Attribute Transfer Algorithm 有权

    公开(公告)号：US20240412419A1

    公开(公告)日：2024-12-12

    申请号：US18807049

    申请日：2024-08-16

    Applicant: Apple Inc.

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

    IPC: G06T9/00 ,  G01S17/89 ,  G06F16/901 ,  G06T17/00

    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. A point cloud attribute transfer algorithm may be used to determine distortion between an original point cloud and a reconstructed point cloud. Additionally, the point cloud attribute transfer algorithm may be used to select attribute values for a reconstructed point cloud such that distortion between an original point cloud and a reconstructed version of the original point cloud is minimized.

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