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    Encoding, Decoding, and Representing High Dynamic Range Images
    14.
    发明申请
    Encoding, Decoding, and Representing High Dynamic Range Images 有权

    公开(公告)号：US20130071022A1

    公开(公告)日：2013-03-21

    申请号：US13675643

    申请日：2012-11-13

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Wenhui Jia ,  Ajit Ninan ,  Arkady Ten ,  Gregory John Ward

    IPC: G06T9/00

    CPC classification number: G06T9/00 ,  H04N9/67 ,  H04N9/77

    Abstract: Techniques are provided to encode and decode image data comprising a tone mapped (TM) image with HDR reconstruction data in the form of luminance ratios and color residual values. In an example embodiment, luminance ratio values and residual values in color channels of a color space are generated on an individual pixel basis based on a high dynamic range (HDR) image and a derivative tone-mapped (TM) image that comprises one or more color alterations that would not be recoverable from the TM image with a luminance ratio image. The TM image with HDR reconstruction data derived from the luminance ratio values and the color-channel residual values may be outputted in an image file to a downstream device, for example, for decoding, rendering, and/or storing. The image file may be decoded to generate a restored HDR image free of the color alterations.

    Auto exposure of spatially-multiplexed-exposure high-dynamic-range image sensor metric and adjustment
    17.
    发明授权
    Auto exposure of spatially-multiplexed-exposure high-dynamic-range image sensor metric and adjustment 有权

    公开(公告)号：US11412154B2

    公开(公告)日：2022-08-09

    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 ,  H04N5/238 ,  H04N5/353 ,  H04N5/355 ,  H04N9/04

    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.

    Rapid estimation of effective illuminance patterns for projected light fields
    20.
    发明授权
    Rapid estimation of effective illuminance patterns for projected light fields 有权

    公开(公告)号：US10540932B2

    公开(公告)日：2020-01-21

    申请号：US16214258

    申请日：2018-12-10

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Lorne A. Whitehead ,  Helge Seetzen ,  Gregory John Ward ,  Wolfgang Heidrich

    IPC: G09G3/34 ,  G09G3/36 ,  G06T3/40

    Abstract: Apparatus and methods are provided that employ one or more of a variety of techniques for reducing the time required to display high resolution images on a high dynamic range display having a light source layer and a display layer. In one technique, the image resolution is reduced, an effective luminance pattern is determined for the reduced resolution image, and the resolution of the effective luminance pattern is then increased to the resolution of the display layer. In another technique, the light source layer's point spread function is decomposed into a plurality of components, and an effective luminance pattern is determined for each component. The effective luminance patterns are then combined to produce a total effective luminance pattern. Additional image display time reduction techniques are provided.

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