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    High precision up-sampling in scalable coding of high bit-depth video
    34.
    发明授权
    High precision up-sampling in scalable coding of high bit-depth video 有权

    公开(公告)号：US10958922B2

    公开(公告)日：2021-03-23

    申请号：US16580820

    申请日：2019-09-24

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Peng Yin ,  Taoran Lu ,  Tao Chen

    IPC: H04N19/33 ,  H04N19/105 ,  H04N19/59 ,  H04N19/80

    Abstract: The precision of up-sampling operations in a layered coding system is preserved when operating on video data with high bit-depth. In response to bit-depth requirements of the video coding or decoding system, scaling and rounding parameters are determined for a separable up-scaling filter. Input data are first filtered across a first spatial direction using a first rounding parameter to generate first up-sampled data. First intermediate data are generated by scaling the first up-sampled data using a first shift parameter. The intermediate data are then filtered across a second spatial direction using a second rounding parameter to generate second up-sampled data. Second intermediate data are generated by scaling the second up-sampled data using a second shift parameter. Final up-sampled data may be generated by clipping the second intermediate data.

    Chroma reshaping of HDR video signals
    36.
    发明授权
    Chroma reshaping of HDR video signals 有权

    公开(公告)号：US10542296B2

    公开(公告)日：2020-01-21

    申请号：US16091078

    申请日：2017-05-09

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Taoran Lu ,  Fangjun Pu ,  Peng Yin ,  Tao Chen

    IPC: H04N19/98 ,  H04N19/85 ,  H04N19/186

    Abstract: Methods for the chroma reshaping of high-dynamic range (HDR) signals are presented. For each input pixel, a first scaler is generated based on the pixel luminance and a luma-based chroma reshaping (LCR) function. A second scaler is generated based on a saturation-based chroma reshaping (SCR) function and the saturation value of the pixel. A cascaded scaler is generated by multiplying the first scaler with the second scaler. Reshaped chroma values are generated by multiplying the input chroma values with the cascaded scaler. The characteristics of preferred LCR and SCR functions are discussed. Inverse decoding methods based on chroma-reshaping metadata that define the LCR and SCR functions are also described.

    Content-adaptive reshaping for high dynamic range images
    38.
    发明授权
    Content-adaptive reshaping for high dynamic range images 有权

    公开(公告)号：US10165275B2

    公开(公告)日：2018-12-25

    申请号：US15410563

    申请日：2017-01-19

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Taoran Lu ,  Fangjun Pu ,  Peng Yin ,  Tao Chen ,  Walter J. Husak

    IPC: H04N19/124 ,  G06T5/00 ,  H04N19/182 ,  H04N19/169 ,  H04N19/186 ,  H04N19/17 ,  H04N19/30 ,  H04N19/85 ,  H04N19/98

    Abstract: A processor for forward reshaping to a target bit depth receives an input image with an input bit depth. The input luminance range is divided into luminance bands and each band is assigned a visual importance index. The output codewords at the target bit depth are divided into codeword bins and each bin is assigned to one of the luminance bands. Each codeword bin is assigned the visual importance index of the luminance band it belongs. Each bin is allocated a number of reshaped codewords according to its visual importance index and a codeword mapping function, where bins with the highest importance index are allocated more codewords than the other bins. A signal reshaping function is generated based on the allocation of codewords, and the reshaping function is applied to the input image to generate an output image in the target bit depth.

    SIGNAL RESHAPING FOR HIGH DYNAMIC RANGE SIGNALS
    39.
    发明申请
    SIGNAL RESHAPING FOR HIGH DYNAMIC RANGE SIGNALS 有权

    公开(公告)号：US20250024086A1

    公开(公告)日：2025-01-16

    申请号：US18899400

    申请日：2024-09-27

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

    IPC: H04N19/87 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/98

    Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

    Signal reshaping for high dynamic range signals
    40.
    发明授权
    Signal reshaping for high dynamic range signals 有权

    公开(公告)号：US12167048B2

    公开(公告)日：2024-12-10

    申请号：US18780325

    申请日：2024-07-22

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Robin Atkins ,  Peng Yin ,  Taoran Lu ,  Jaclyn Anne Pytlarz

    IPC: H04N19/82 ,  H04N1/60 ,  H04N19/46 ,  H04N19/85 ,  H04N19/87 ,  H04N19/98

    Abstract: In a method to improve backwards compatibility when decoding high-dynamic range images coded in a wide color gamut (WCG) space which may not be compatible with legacy color spaces, hue and/or saturation values of images in an image database are computed for both a legacy color space (say, YCbCr-gamma) and a preferred WCG color space (say, IPT-PQ). Based on a cost function, a reshaped color space is computed so that the distance between the hue values in the legacy color space and rotated hue values in the preferred color space is minimized. HDR images are coded in the reshaped color space. Legacy devices can still decode standard dynamic range images assuming they are coded in the legacy color space, while updated devices can use color reshaping information to decode HDR images in the preferred color space at full dynamic range.

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