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    Chroma quantization in video coding
    21.
    发明专利
    Chroma quantization in video coding 未知

    公开(公告)号：AU2018203223A1

    公开(公告)日：2018-05-24

    申请号：AU2018203223

    申请日：2018-05-09

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS ,  COTE GUY

    IPC: H04N19/124

    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.

    Adaptive color space transform coding
    22.
    发明专利
    Adaptive color space transform coding 未知

    公开(公告)号：AU2017265177A1

    公开(公告)日：2017-12-14

    申请号：AU2017265177

    申请日：2017-11-27

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS

    IPC: H04N19/122 ,  H04N19/186 ,  H04N19/196 ,  H04N19/46

    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.

    Sample adaptive offset control
    23.
    发明专利
    Sample adaptive offset control 未知

    公开(公告)号：AU2014281169A1

    公开(公告)日：2015-12-10

    申请号：AU2014281169

    申请日：2014-05-01

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS

    IPC: H04N19/186 ,  H04N19/44 ,  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.

    Sample adaptive offset control
    27.
    发明专利
    Sample adaptive offset control 未知

    公开(公告)号：AU2021204661B2

    公开(公告)日：2022-11-24

    申请号：AU2021204661

    申请日：2021-07-02

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS

    IPC: H04N19/186 ,  H04N19/44 ,  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.

    Chroma quantization in video coding
    29.
    发明专利
    Chroma quantization in video coding 未知

    公开(公告)号：AU2021203738B2

    公开(公告)日：2021-07-15

    申请号：AU2021203738

    申请日：2021-06-07

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS ,  COTE GUY

    IPC: H04N19/124

    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.

    Chroma quantization in video coding
    30.
    发明专利
    Chroma quantization in video coding 未知

    公开(公告)号：AU2021203738A1

    公开(公告)日：2021-07-01

    申请号：AU2021203738

    申请日：2021-06-07

    Applicant: APPLE INC

    Inventor： TOURAPIS ALEXANDROS ,  COTE GUY

    IPC: H04N19/124

    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.

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