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    Guided Post-Prediction Filtering in Layered VDR Coding
    31.
    发明申请
    Guided Post-Prediction Filtering in Layered VDR Coding 有权
    在分层VDR编码中引导后预测过滤

    公开(公告)号：US20130148907A1

    公开(公告)日：2013-06-13

    申请号：US13706089

    申请日：2012-12-05

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Tao Chen ,  Peng Yin ,  Sheng Qu

    IPC: G06T9/00

    CPC classification number: G06T9/004 ,  H04N19/117 ,  H04N19/154 ,  H04N19/17 ,  H04N19/50 ,  H04N19/80

    Abstract: A visual dynamic range (VDR) coding system creates a sequence of VDR prediction images using corresponding standard dynamic range (SDR) images and a prediction function. For each prediction image, an encoder identifies one or more areas within the prediction image suitable for post-prediction filtering. For each identified post-prediction area, a post-prediction filtering mode is selected among one or more post-prediction filtering modes. The selected post-prediction filtering mode is applied to output a filtered prediction image. Information related to the post-prediction filtering areas and the selected corresponding post-prediction filtering modes may be communicated to a receiver (e.g., as metadata) for guided post-prediction filtering. Example post-prediction filtering modes that use low-pass averaging filtering or adaptive linear interpolation are also described.

    Abstract translation: 视觉动态范围（VDR）编码系统使用相应的标准动态范围（SDR）图像和预测函数创建VDR预测图像序列。 对于每个预测图像，编码器识别适合于后预测滤波的预测图像内的一个或多个区域。 对于每个识别的后预测区域，在一个或多个后预测滤波模式中选择后预测滤波模式。 所选择的后预测滤波模式被应用以输出滤波预测图像。 与后预测滤波区域相关的信息和所选择的相应的后预测滤波模式可以被传送到接收机（例如，作为元数据）用于指导的后预测滤波。 还描述了使用低通平均滤波或自适应线性插值的示例性后预测滤波模式。

    Backward compatible display management metadata compression
    32.
    发明授权
    Backward compatible display management metadata compression 有权

    公开(公告)号：US11272213B2

    公开(公告)日：2022-03-08

    申请号：US16649604

    申请日：2018-09-21

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Neeraj J. Gadgil ,  Tao Chen ,  Sheng Qu

    IPC: H04N19/70 ,  H04N19/132 ,  H04N19/68 ,  H04N19/89

    Abstract: Sequence-level parameters are generated for an image frame sequence including sequence-level indicators for indicating metadata types present for each image frame in the sequence of image frames. Frame-present parameters are generated for a specific image frame in the sequence including frame-present indicators corresponding to the metadata types as indicated in the sequence-level parameters. The frame-present indicators identify first metadata types for which metadata parameter values are to be encoded in a coded bitstream as metadata payloads. The image frame sequence, the sequence-level parameters, the frame-present parameters and the metadata payloads are encoded in the coded bitstream. A recipient device can generate, from the specific image frame based partly on the metadata parameter values determined for the first metadata types, a target display image for a target display.

    Video coding and delivery with both spatial and dynamic range scalability
    33.
    发明授权
    Video coding and delivery with both spatial and dynamic range scalability 有权

    公开(公告)号：US10575005B2

    公开(公告)日：2020-02-25

    申请号：US15745647

    申请日：2016-07-20

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Sheng Qu ,  Samir N. Hulyalkar ,  David Brooks

    IPC: H04N19/33 ,  H04N19/59

    Abstract: In a method to code and transmit scalable HDR video signals, HDR signals are processed and encoded in the IPT-PQ color space to generate a base layer at reduced spatial resolution and/or dynamic range, and an enhancement layer with a residual signal. A signal reshaping block before the base layer encoder allows for improved coding of HDR signals using a reduced bit depth. A decoder can use a BL decoder and backward reshaping to generate a decoded BL HDR signal at a reduced dynamic range and/or spatial resolution, or it can combine the decoded BL HDR signal and the EL stream to generate a decoded HDR signal at full dynamic range and full resolution.

    Guided color transient improvement filtering in video coding
    39.
    发明授权
    Guided color transient improvement filtering in video coding 有权
    视频编码中的引导色彩瞬态改善滤波

    公开(公告)号：US09338470B2

    公开(公告)日：2016-05-10

    申请号：US14748004

    申请日：2015-06-23

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Sheng Qu

    IPC: H04N19/44 ,  H04N19/89 ,  H04N19/46 ,  H04N19/117 ,  H04N19/137 ,  H04N19/186 ,  H04N19/187 ,  H04N19/80 ,  H04N19/33 ,  H04N19/86 ,  H04N19/59

    CPC classification number: H04N19/44 ,  H04N19/117 ,  H04N19/137 ,  H04N19/186 ,  H04N19/187 ,  H04N19/33 ,  H04N19/46 ,  H04N19/59 ,  H04N19/80 ,  H04N19/86 ,  H04N19/89

    Abstract: An encoder receives a target image in a standard dynamic range and a guide image in a high dynamic range, wherein both the target image and the guide image represent the same scene. A color transient improvement (CTI) filter is selected to predict a chroma component of a decoded version of the target image based on both the luma and chroma components of the target image and the guide image. The filtering coefficients for the CTI filter are computed by minimizing an error measurement (e.g., MSE) between pixel values of the decoded image and the guide image. The computed set of filtering coefficients is signaled to a receiver (e.g., as metadata). A decoder receives the coded image and the metadata, and applies the same CTI filter to the decoded image to generate an output image.

    Abstract translation: 编码器接收标准动态范围内的目标图像和高动态范围内的引导图像，其中目标图像和引导图像都表示相同的场景。 选择颜色瞬态改善（CTI）滤波器以基于目标图像和引导图像的亮度和色度分量来预测目标图像的解码版本的色度分量。 通过最小化解码图像的像素值和引导图像之间的误差测量（例如，MSE）来计算CTI滤波器的滤波系数。 所计算的滤波系数组被发送给接收机（例如，作为元数据）。 解码器接收编码图像和元数据，并将相同的CTI滤波器应用于解码图像以产生输出图像。

    Joint base layer and enhancement layer quantizer adaptation in EDR video coding
    40.
    发明授权
    Joint base layer and enhancement layer quantizer adaptation in EDR video coding 有权
    EDR视频编码中的联合基层和增强层量化器适应

    公开(公告)号：US09219916B2

    公开(公告)日：2015-12-22

    申请号：US13908926

    申请日：2013-06-03

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Qian Chen ,  Hubert Koepfer ,  Sheng Qu

    IPC: H04N19/90 ,  H04N19/126 ,  H04N19/136 ,  H04N19/186 ,  H04N19/179 ,  H04N19/187 ,  H04N19/36

    CPC classification number: H04N19/186 ,  G09G5/10 ,  G09G2370/04 ,  H04N19/126 ,  H04N19/132 ,  H04N19/136 ,  H04N19/142 ,  H04N19/179 ,  H04N19/182 ,  H04N19/187 ,  H04N19/30 ,  H04N19/36 ,  H04N19/90

    Abstract: An encoder receives one or more input pictures of enhanced dynamic range (EDR) to be encoded in a coded bit stream comprising a base layer and one or more enhancement layer. The encoder comprises a base layer quantizer (BLQ) and an enhancement layer quantizer (ELQ) and selects parameters of the BLQ and the ELQ by a joint BLQ-ELQ adaptation method which given a plurality of candidate sets of parameters for the BLQ, for each candidate set, computes a joint BLQ-ELQ distortion value based on a BLQ distortion function, an ELQ distortion function, and at least in part on the number of input pixels to be quantized by the ELQ. The encoder selects as the output BLQ parameter set the candidate set for which the computed joint BLQ-ELQ distortion value is the smallest. Example ELQ, BLQ, and joint BLQ-ELQ distortion functions are provided.

    Abstract translation: 编码器接收要编码在包括基本层和一个或多个增强层的编码比特流中的增强动态范围（EDR）的一个或多个输入图像。 编码器包括基本层量化器（BLQ）和增强层量化器（ELQ），并且通过联合BLQ-ELQ适配方法来选择BLQ和ELQ的参数，该方法为每个BLQ给出了多个用于BLQ的候选参数组 候选集合，基于BLQ失真函数，ELQ失真函数，并且至少部分地基于由ELQ量化的输入像素的数量来计算联合BLQ-ELQ失真值。 编码器选择输出BLQ参数设置计算出的关节BLQ-ELQ失真值最小的候选组。 提供了例如ELQ，BLQ和联合BLQ-ELQ失真功能。

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