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    Adaptive false contouring prevention in layered coding of images with extended dynamic range
    51.
    发明授权
    Adaptive false contouring prevention in layered coding of images with extended dynamic range 有权
    具有扩展动态范围的图像的分层编码中的自适应假轮廓预防

    公开(公告)号：US08873877B2

    公开(公告)日：2014-10-28

    申请号：US14353090

    申请日：2012-11-01

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Guan-Ming Su ,  Sheng Qu ,  Scott Daly

    IPC: G06K9/36 ,  G06T9/00

    CPC classification number: G06T9/00 ,  H04N19/124 ,  H04N19/154 ,  H04N19/176 ,  H04N19/179 ,  H04N19/182 ,  H04N19/192 ,  H04N19/46 ,  H04N19/86 ,  H04N19/98

    Abstract: An encoder receives a sequence of images in extended or visual dynamic range (VDR). For each image, a dynamic range compression function and associated parameters are selected to convert the input image into a second image with a lower dynamic range. Using the input image and the second image, a residual image is computed. The input VDR image sequence is coded using a layered codec that uses the second image as a base layer and a residual image that is derived from the input and second images as one or more residual layers. Using the residual image, a false contour detection method (FCD) estimates the number of potential perceptually visible false contours in the decoded VDR image and iteratively adjusts the dynamic range compression parameters to prevent or reduce the number of false contours. Examples that use a uniform dynamic range compression function are also described.

    Abstract translation: 编码器在扩展或视觉动态范围（VDR）中接收一系列图像。 对于每个图像，选择动态范围压缩函数和相关联的参数以将输入图像转换为具有较低动态范围的第二图像。 使用输入图像和第二图像，计算残差图像。 输入VDR图像序列使用分层编解码器进行编码，其使用第二图像作为基本层，并且从输入和第二图像导出的残差图像作为一个或多个残余层。 使用残差图像，假轮廓检测方法（FCD）估计解码的VDR图像中潜在的感知可见假轮廓的数量，并且迭代地调整动态范围压缩参数以防止或减少假轮廓的数量。 还描述了使用均匀动态范围压缩功能的示例。

    Joint Base Layer and Enhancement Layer Quantizer Adaptation in EDR Video Coding
    52.
    发明申请
    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：US20130329778A1

    公开(公告)日：2013-12-12

    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: H04N7/26

    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。

    Guided Post-Prediction Filtering in Layered VDR Coding
    53.
    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。

    Adaptive streaming with false contouring alleviation
    54.
    发明授权
    Adaptive streaming with false contouring alleviation 有权

    公开(公告)号：US12301848B2

    公开(公告)日：2025-05-13

    申请号：US18020015

    申请日：2021-08-05

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Neeraj J. Gadgil ,  Guan-Ming Su ,  Harshad Kadu

    IPC: H04N19/36 ,  H04N19/132 ,  H04N19/186 ,  H04N19/46

    Abstract: A forward reshaping mapping is generated to map a source image to a corresponding forward reshaped image of a lower dynamic range. The source image is spatially downsampled to generate a resized image into which noise is injected to generate a noise injected image. The forward reshaping mapping is applied to map the noise injected image to generate a noise embedded image of the lower dynamic range. A video signal is encoded with the noise embedded image and delivered to a recipient device for the recipient device to render a display image generated from the noise embedded image.

    Efficient user-defined SDR-to-HDR conversion with model templates
    55.
    发明授权
    Efficient user-defined SDR-to-HDR conversion with model templates 有权

    公开(公告)号：US12272039B2

    公开(公告)日：2025-04-08

    申请号：US17635684

    申请日：2020-08-12

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Guan-Ming Su ,  Harshad Kadu

    IPC: G06T5/92

    Abstract: Backward reshaping metadata prediction models are trained with training SDR images and corresponding training HDR images. Content creation user input to define user adjusted HDR appearances for the corresponding training HDR images is received. Content-creation-user-specific modified backward reshaping metadata prediction models are generated based on the trained prediction models and the content creation user input. The content-creation-user-specific modified prediction models are used to predict operational parameter values of content-creation-user-specific backward reshaping mappings for backward reshaping SDR images into mapped HDR images of at least one content-creation-user-adjusted HDR appearance.

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