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    Chroma reshaping of HDR video signals
    31.
    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.

    Backward-compatible HDR codecs with temporal scalability
    34.
    发明授权
    Backward-compatible HDR codecs with temporal scalability 有权

    公开(公告)号：US10440401B2

    公开(公告)日：2019-10-08

    申请号：US15481015

    申请日：2017-04-06

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Guan-Ming Su ,  Qian Chen ,  Tao Chen ,  David Brooks ,  Samir N. Hulyalkar ,  Peng Yin

    IPC: H04N7/18 ,  H04N11/02 ,  H04N11/04 ,  H04N19/98 ,  H04N19/50 ,  H04N19/31 ,  H04N19/70 ,  H04N19/33

    Abstract: A processor for video coding receives a full-frame rate (FFR) HDR video signal and a corresponding FFR SDR video signal. An encoder generates a scalable bitstream that allows decoders to generate half-frame-rate (HFR) SDR, FFR SDR, HFR HDR, or FFR HDR signals. Given odd and even frames of the input FFR SDR signal, the scalable bitstream combines a base layer of coded even SDR frames with an enhancement layer of coded packed frames, where each packed frame includes a downscaled odd SDR frame, a downscaled even HDR residual frame, and a downscaled odd HDR residual frame. In an alternative implementation, the scalable bitstream combines four signals layers: a base layer of even SDR frames, an enhancement layer of odd SDR frames, a base layer of even HDR residual frames and an enhancement layer of odd HDR residual frames. Corresponding decoder architectures are also presented.

    Content-adaptive reshaping for high dynamic range images
    35.
    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.

    Layer decomposition in hierarchical VDR coding
    36.
    发明授权
    Layer decomposition in hierarchical VDR coding 有权

    公开(公告)号：US09924171B2

    公开(公告)日：2018-03-20

    申请号：US15280822

    申请日：2016-09-29

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  Tao Chen ,  Walter C. Gish ,  Hubert Koepfer

    IPC: H04N19/103 ,  H04N19/124 ,  H04N19/98 ,  H04N19/30 ,  H04N19/126

    CPC classification number: H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

    Abstract: Techniques use multiple lower bit depth (e.g., 8 bits) codecs to provide higher bit depth (e.g., 12+ bits) high dynamic range images from an upstream device to a downstream device. Multiple layers comprising a base layer and one or more enhancement layers may be used to carry video signals comprising image data compressed by lower bit depth encoders to a downstream device, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization. Adaptive dynamic range adaptation techniques take into consideration special transition effects, such as fade-in and fade-outs, for improved coding performance.

    Layer decomposition in hierarchical VDR coding
    37.
    发明授权
    Layer decomposition in hierarchical VDR coding 有权
    分层VDR编码中的层分解

    公开(公告)号：US09497456B2

    公开(公告)日：2016-11-15

    申请号：US14351647

    申请日：2012-11-01

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  Tao Chen ,  Walter C. Gish ,  Hubert Koepfer

    IPC: H04N19/126 ,  H04N19/30 ,  H04N19/124 ,  H04N19/103 ,  H04N19/98

    CPC classification number: H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

    Abstract: Techniques use multiple lower bit depth codecs to provide higher bit depth, high dynamic range, images from an upstream device to a downstream device. A base layer and one or more enhancement layers may be used to carry video signals, wherein the base layer cannot be decoded and viewed on its own. Lower bit depth input image data to base layer processing may be generated from higher bit depth high dynamic range input image data via advanced quantization to minimize the volume of image data to be carried by enhancement layer video signals. The image data in the enhancement layer video signals may comprise residual values, quantization parameters, and mapping parameters based in part on a prediction method corresponding to a specific method used in the advanced quantization. Adaptive dynamic range adaptation techniques take into consideration special transition effects, such as fade-in and fade-outs, for improved coding performance.

    Abstract translation: 技术使用多个较低位深度编解码器来提供更高的位深度，高动态范围，从上游设备到下游设备的图像。 基本层和一个或多个增强层可用于承载视频信号，其中基本层不能自己解码和观看。 低位深度输入图像数据到基层处理可以通过高级量化从较高位深度高动态范围输入图像数据生成，以最小化由增强层视频信号承载的图像数据的体积。 增强层视频信号中的图像数据可以部分地基于对应于高级量化中使用的特定方法的预测方法而包括残差值，量化参数和映射参数。 自适应动态范围适应技术考虑到特殊的过渡效应，如淡入和淡出，以提高编码性能。

    Multi-layer backwards-compatible video delivery for enhanced dynamic range and enhanced resolution formats
    38.
    发明授权
    Multi-layer backwards-compatible video delivery for enhanced dynamic range and enhanced resolution formats 有权
    多层向后兼容的视频传输，用于增强动态范围和增强的分辨率格式

    公开(公告)号：US09357197B2

    公开(公告)日：2016-05-31

    申请号：US13891997

    申请日：2013-05-10

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Tao Chen ,  Samir N. Hulyalkar

    IPC: H04N13/00 ,  H04N15/00 ,  H04N19/597 ,  H04N19/33

    CPC classification number: H04N13/161 ,  H04N19/33 ,  H04N19/597

    Abstract: A sequence of enhanced dynamic range (EDR) images and a sequence of standard dynamic range images are encoded using a backwards-compatible SDR high-definition (HD) base layer and one or more enhancement layers. The EDR and SDR video signals may be of the same resolution (e.g., HD) or at different resolutions (e.g., 4K and HD) and are encoded using a dual-view-dual-layer (DVDL) encoder to generate a coded base layer (BL) and a coded enhancement layer (EL). The DVDL encoder includes a reference processing unit (RPU) which is adapted to compute a reference stream based on the coded BL stream. The RPU operations include post-processing, normalization, inverse normalization, and image registration. Decoders for decoding the coded BL and EL streams to generate a backwards compatible 2D SDR stream and additional 2D or 3D SDR or EDR streams, are also described.

    Abstract translation: 增强动态范围（EDR）图像和一系列标准动态范围图像的序列使用向后兼容的SDR高清（HD）基础层和一个或多个增强层进行编码。 EDR和SDR视频信号可以具有相同的分辨率（例如HD）或不同分辨率（例如，4K和HD），并且使用双视图双层（DVDL）编码器进行编码，以生成编码的基本层 （BL）和编码增强层（EL）。 DVDL编码器包括参考处理单元（RPU），该参考处理单元适于基于编码的BL流来计算参考流。 RPU操作包括后处理，归一化，反归一化和映像注册。 还描述了用于解码编码的BL和EL流以生成向后兼容的2D SDR流和附加的2D或3D SDR或EDR流的解码器。

    Dual-Layer Backwards-Compatible Progressive Video Delivery
    40.
    发明申请
    Dual-Layer Backwards-Compatible Progressive Video Delivery 有权
    双层向后兼容逐行视频传输

    公开(公告)号：US20140376612A1

    公开(公告)日：2014-12-25

    申请号：US14368640

    申请日：2012-12-13

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Tao Chen ,  Hariharan Ganapathy-Kathirvelu ,  Samir Hulyalkar ,  Gopi Lakshminarayanan

    IPC: H04N19/34 ,  H04N19/172

    CPC classification number: H04N19/172 ,  H04N7/012 ,  H04N13/139 ,  H04N13/161 ,  H04N19/112 ,  H04N19/187 ,  H04N19/30 ,  H04N19/34 ,  H04N19/59 ,  H04N19/597 ,  H04N19/85

    Abstract: Given an input progressive sequence, a video encoder creates a dual-layer stream that combines a backwards-compatible interlaced video stream layer with an enhancement layer to reconstruct full-resolution progressive video. Given two consecutive frames in the input progressive sequence, vertical processing generates a top field-bottom field (TFBF) frame in a base layer (BL) TFBF sequence, and horizontal processing generates a side-by-side (SBS) frame in an enhancement layer (EL) SBS video sequence. The BL TFBF and the EL SBS sequences are compressed together to create a coded, backwards compatible output stream.

    Abstract translation: 给定输入逐行序列，视频编码器创建将后向兼容隔行视频流层与增强层相结合的双层流，以重建全分辨率逐行视频。 给定输入渐进序列中的两个连续的帧，垂直处理在基本层（BL）TFBF序列中生成顶部场下场（TFBF）帧，并且水平处理在增强中生成并排（SBS）帧 层（EL）SBS视频序列。 BL TFBF和EL SBS序列被压缩在一起以创建编码的向后兼容的输出流。

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