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149 条记录 (耗时 0.033 秒)

    Distribution of multi-format high dynamic range video using layered coding
    11.
    发明授权
    Distribution of multi-format high dynamic range video using layered coding 有权

    公开(公告)号：US11146803B2

    公开(公告)日：2021-10-12

    申请号：US14772051

    申请日：2014-02-14

    申请人： DOLBY LABORATORIES LICENSING CORPORATION

    发明人： Guan-Ming Su ,  Samir N. Hulyalkar ,  Tao Chen

    IPC分类号： H04N19/33 ,  H04N19/124 ,  H04N19/157 ,  H04N19/44 ,  H04N19/593 ,  H04N19/70 ,  G06T3/40

    摘要： An encoder receives an input enhanced dynamic range (EDR) image to be stored or transmitted using multiple coding formats in a layered representation. A layer decomposer generates a lower dynamic range (LDR) image from the EDR image. One or more base layer (BL) encoders encode the LDR image to generate a main coded BL stream and one or more secondary coded BL streams, where each secondary BL stream is coded in a different coding format than the main coded BL stream. A single enhancement layer (EL) coded stream and related metadata are generated using the main coded BL stream, the LDR image, and the input EDR image. An output coded stream includes the coded EL stream, the metadata, and either the main coded BL stream or one of the secondary coded BL streams. Computation-scalable decoding and display management processes for EDR images are also described.

    Backward-compatible HDR codecs with temporal scalability
    13.
    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

    申请人： DOLBY LABORATORIES LICENSING CORPORATION

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

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

    摘要： 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.

    Layer decomposition in hierarchical VDR coding
    15.
    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

    申请人： Dolby Laboratories Licensing Corporation

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

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

    CPC分类号： H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

    摘要： 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.

    Scene-change detection using video stream pairs
    16.
    发明授权
    Scene-change detection using video stream pairs 有权

    公开(公告)号：US09866734B2

    公开(公告)日：2018-01-09

    申请号：US14801633

    申请日：2015-07-16

    申请人： Dolby Laboratories Licensing Corporation

    发明人： Seyedalireza Golestaneh ,  Guan-Ming Su

    IPC分类号： H04N5/14 ,  G06T7/00 ,  H04N19/30 ,  H04N19/87

    CPC分类号： H04N5/147 ,  H04N19/30 ,  H04N19/87

    摘要： A scene change is determined using a first and a second video signal, each representing the same scene or content, but at a different color grade (such as dynamic range). A set of prediction coefficients is generated to generate prediction signals approximating the first signal based on the second signal and a prediction model. A set of prediction error signals is generated based on the prediction signals and the first signal. Then, a scene change is detected based on the characteristics of the prediction error signals. Alternatively, a set of entropy values of the difference signals between the first and second video signals are computed, and a scene change is detected based on the characteristics of the entropy values.

    Hardware efficient sparse FIR filtering in video codec
    18.
    发明授权
    Hardware efficient sparse FIR filtering in video codec 有权

    公开(公告)号：US09712834B2

    公开(公告)日：2017-07-18

    申请号：US14488415

    申请日：2014-09-17

    申请人： Dolby Laboratories Licensing Corporation

    发明人： Guan-Ming Su ,  Qian Chen ,  Peng Yin ,  Sheng Qu

    IPC分类号： H04N19/33 ,  H04N19/86 ,  H04N19/85

    CPC分类号： H04N19/33 ,  H04N19/85 ,  H04N19/86

    摘要： In an embodiment, a control map of false contour filtering is generated for a predicted image. The predicted image is predicted from a low dynamic range image mapped from the wide dynamic range image. Based at least in part on the control map of false contour filtering and the predicted image, one or more filter parameters for a sparse finite-impulse-response (FIR) filter are determined. The sparse FIR filter is applied to filter pixel values in a portion of the predicted image based at least in part on the control map of false contour filtering. The control map of false contour filtering is encoded into a part of a multi-layer video signal that includes the low dynamic range image.

    Layer decomposition in hierarchical VDR coding
    20.
    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

    申请人： DOLBY LABORATORIES LICENSING CORPORATION

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

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

    CPC分类号： H04N19/124 ,  H04N19/103 ,  H04N19/126 ,  H04N19/142 ,  H04N19/187 ,  H04N19/30 ,  H04N19/98

    摘要： 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.

    摘要翻译： 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。