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    Chroma quantization in video coding
    211.
    发明授权
    Chroma quantization in video coding 有权
    视频编码中的色度量化

    公开(公告)号：US09510002B2

    公开(公告)日：2016-11-29

    申请号：US14452485

    申请日：2014-08-05

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  Guy Cote

    IPC: H04N19/117 ,  H04N19/124 ,  H04N19/30 ,  H04N19/70 ,  H04N19/126 ,  H04N19/186 ,  H04N19/157 ,  H04N19/136 ,  H04N19/96 ,  H04N19/86

    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。

    Entropy coding techniques and protocol to support parallel processing with low latency
    212.
    发明授权
    Entropy coding techniques and protocol to support parallel processing with low latency 有权
    熵编码技术和协议支持低延迟的并行处理

    公开(公告)号：US09344720B2

    公开(公告)日：2016-05-17

    申请号：US13715088

    申请日：2012-12-14

    Applicant: Apple Inc.

    Inventor： David W. Singer ,  Alexandros Tourapis ,  Athanasios Leontaris ,  Xiaosong Zhou

    IPC: H04N11/04 ,  H04N19/13 ,  H04N19/70 ,  H04N19/117 ,  H04N19/174 ,  H04N19/436

    CPC classification number: H04N19/13 ,  H04N19/117 ,  H04N19/174 ,  H04N19/436 ,  H04N19/70

    Abstract: In a communication system, parallel encoding and decoding of serially-coded data occurs in a manner that supports low latency communication. A plurality of data items may be coded as serially-coded data sequences and a transmission sequence may be built from them. An index table may be built having a plurality of entries representing respective start points of the serially-coded data sequences within the transmission sequence. The transmission sequence may be transmitted to a channel and, thereafter, the index table may be transmitted. Latencies otherwise involved in inserting an index table into the beginning of a transmission sequence may be avoided.

    Abstract translation: 在通信系统中，串行编码数据的并行编码和解码以支持低延迟通信的方式发生。 多个数据项可以被编码为串行编码数据序列，并且可以从它们构建传输序列。 可以构建索引表，其具有表示传输序列内的串行编码数据序列的相应开始点的多个条目。 发送序列可以被发送到信道，此后可以发送索引表。 可以避免将索引表插入到传输序列的开始处的延迟。

    ADAPTIVE COLOR SPACE TRANSFORM CODING
    213.
    发明申请
    ADAPTIVE COLOR SPACE TRANSFORM CODING 审中-公开
    自适应颜色空间变换编码

    公开(公告)号：US20160119622A1

    公开(公告)日：2016-04-28

    申请号：US14931158

    申请日：2015-11-03

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis

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

    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。

    ADAPTIVE TRANSFER FUNCTION FOR VIDEO ENCODING AND DECODING
    215.
    发明申请
    ADAPTIVE TRANSFER FUNCTION FOR VIDEO ENCODING AND DECODING 审中-公开
    用于视频编码和解码的自适应传输函数

    公开(公告)号：US20150245050A1

    公开(公告)日：2015-08-27

    申请号：US14631410

    申请日：2015-02-25

    Applicant: Apple Inc.

    Inventor： Alexandros Tourapis ,  David Singer

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

    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.

    Abstract translation: 视频编码和解码系统，在内部用于信号表示的编解码器中实现自适应传递函数方法。 可以为输入视频的每个场景，序列，帧或区域动态地确定表示人类视觉系统的有效动态范围的聚焦动态范围。 视频数据可以根据用于编解码器内的编码的传递函数进行裁剪和量化为编解码器的比特深度。 传递函数可以与输入视频数据的传递函数相同，也可以是编解码器内部的传递函数。 编码的视频数据可以被解码并扩展到显示器的动态范围。 自适应传递函数方法使得编解码器能够使用较少的位用于信号的内部表示，同时仍然表示输出中的信号的整个动态范围。

    ADAPTIVE COLOR SPACE TRANSFORM CODING
    216.
    发明申请
    ADAPTIVE COLOR SPACE TRANSFORM CODING 有权
    自适应颜色空间变换编码

    公开(公告)号：US20140355897A1

    公开(公告)日：2014-12-04

    申请号：US13905889

    申请日：2013-05-30

    Applicant: Apple, Inc.

    Inventor： Alexandros Tourapis

    IPC: G06T9/00

    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。

    Mesh Compression with Base Mesh Information Signaled in a First Sub-Bitstream and Sub-Mesh Information Signaled with Displacement Information in an Additional Sub-Bitstream
    217.
    发明申请
    Mesh Compression with Base Mesh Information Signaled in a First Sub-Bitstream and Sub-Mesh Information Signaled with Displacement Information in an Additional Sub-Bitstream 有权

    公开(公告)号：US20250117965A1

    公开(公告)日：2025-04-10

    申请号：US18908679

    申请日：2024-10-07

    Applicant: Apple Inc.

    Inventor： Jungsun Kim ,  Alexandros Tourapis

    IPC: G06T9/00 ,  H04N19/70

    Abstract: A system comprises an encoder configured to compress and encode data for a three-dimensional dynamic mesh. The three-dimensional dynamic mesh is compressed and signaled using a base-mesh sub-bitstream and an atlas sub-bitstream (e.g., displacement and/or attribute sub-bitstream). The atlas sub-bitstream comprises displacement information to be applied at sub-division points of the base mesh to recreate the three-dimensional dynamic mesh at a given moment in time and may also include attribute values, such as colors, textures, etc. to be applied to the reconstructed mesh. Sub-mesh identifiers are included in tile headers of an atlas sub-bitstream that enable selective reconstruction of sub-meshes. A complimentary decoder decodes a compressed bitstream for the three-dimensional dynamic mesh, encoded such as by the encoder.

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