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    AUTO EXPOSURE OF SPATIALLY-MULTIPLEXED-EXPOSURE HIGH-DYNAMIC-RANGE IMAGE SENSORS
    1.
    发明申请
    AUTO EXPOSURE OF SPATIALLY-MULTIPLEXED-EXPOSURE HIGH-DYNAMIC-RANGE IMAGE SENSORS 有权

    公开(公告)号：US20210243352A1

    公开(公告)日：2021-08-05

    申请号：US17274161

    申请日：2019-09-05

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Jon S. MCELVAIN ,  Walter C. GISH ,  Jonathan Robert MILLER ,  Gregory John WARD ,  Robin ATKINS

    IPC: H04N5/235 ,  H04N5/355

    Abstract: An auto exposure method for a spatially-multiplexed-exposure (SME) high-dynamic-range (HDR) image sensor includes (a) retrieving raw image data from an exposure of the spatially-multiplexed-exposure high-dynamic-range image sensor, (b) preprocessing long-exposure pixel values and short-exposure pixel values of the raw image data to remove therefrom long-exposure pixel values and short-exposure pixel values failing to meet one or more quality requirements, (c) synthesizing, into an high-dynamic-range histogram, the long-exposure pixel values remaining after the step of preprocessing and the short-exposure pixel values remaining after the step of preprocessing, (d) deriving a goodness metric from the high-dynamic-range histogram, (e) adjusting at least one of the long exposure time and the short exposure time, based at least in part upon the goodness metric, and (f) outputting the at least one of the long exposure time and the short exposure time, as adjusted, to the spatially-multiplexed-exposure high-dynamic-range image sensor.

    Layer Decomposition in Hierarchical VDR Coding
    2.
    发明申请
    Layer Decomposition in Hierarchical VDR Coding 有权
    层次分解VDR编码中的层分解

    公开(公告)号：US20170019670A1

    公开(公告)日：2017-01-19

    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: H04N19/124 ,  H04N19/103

    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.

    Abstract translation: 技术使用多个较低位深度（例如，8位）编解码器来从上游设备向下游设备提供较高的比特深度（例如，12+比特）高动态范围图像。 包括基层和一个或多个增强层的多层可以用于将包括由下位深度编码器压缩的图像数据的视频信号携带到下游设备，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。

    Quantization Control for Variable Bit Depth
    3.
    发明申请
    Quantization Control for Variable Bit Depth 审中-公开

    公开(公告)号：US20200099930A1

    公开(公告)日：2020-03-26

    申请号：US16695935

    申请日：2019-11-26

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Walter C. GISH ,  Christopher J. VOGT

    IPC: H04N19/124 ,  H04N19/184 ,  H04N19/126 ,  H04N19/61

    Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

    Quantization Control for Variable Bit Depth
    5.
    发明申请
    Quantization Control for Variable Bit Depth 有权

    公开(公告)号：US20210203936A1

    公开(公告)日：2021-07-01

    申请号：US17201129

    申请日：2021-03-15

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Walter C. GISH ,  Christopher J. VOGT

    IPC: H04N19/124 ,  H04N19/61 ,  H04N19/126 ,  H04N19/184

    Abstract: The quantization parameter QP is well-known in digital video compression as an indication of picture quality. Digital symbols representing a moving image are quantized with a quantizing step that is a function QSN of the quantization parameter QP, which function QSN has been normalized to the most significant bit of the bit depth of the digital symbols. As a result, the effect of a given QP is essentially independent of bit depth a particular QP value has a standard effect on image quality, regardless of bit depth. The invention is useful, for example, in encoding and decoding at different bit depths, to generate compatible, bitstreams having different bit depths, and to allow different bit depths for different components of a video signal by compressing each with the same fidelity (i.e., the same QP).

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