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    Image processing for HDR images
    2.
    发明授权
    Image processing for HDR images 有权
    HDR图像的图像处理

    公开(公告)号：US09076224B1

    公开(公告)日：2015-07-07

    申请号：US14239047

    申请日：2013-07-31

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Ankur Shah ,  Ajit Ninan ,  Wenhui Jia ,  Huiming Tong ,  Qiaoli Yang

    IPC: G06K9/36 ,  G06T5/00 ,  H04N19/124 ,  H04N19/186 ,  H04N19/117 ,  H04N19/182

    CPC classification number: H04N19/136 ,  G06K9/4652 ,  G06T5/009 ,  G06T5/50 ,  G06T7/90 ,  G06T2207/20008 ,  G06T2207/20024 ,  G06T2207/20208 ,  H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/182 ,  H04N19/184 ,  H04N19/186 ,  H04N19/33 ,  H04N19/44 ,  H04N19/46

    Abstract: Image encoding is described. Log-luminances in an HDR input image are histogrammed to generate a tone-map, along with which a log global tone-mapped luminance image is computed. The log global tone-mapped luminance image is downscaled. The log-luminances and the log global tone-mapped luminance image generate a log ratio image. Multi-scale resolution filtering the log ratio image generates a log multi-scale ratio image. The log multi-scale ratio image and the log luminances generate a second log tone-mapped image, which is normalized to output a tone-mapped image based on the downscaled log global tone-mapped luminance image and the normalized image. The HDR input image and the output tone-mapped image generate a second ratio image, which is quantized.

    Abstract translation: 描述图像编码。 对HDR输入图​​像中的对数亮度进行直方图，以生成色调图，并计算出对数全局色调映射的亮度图像。 日志全局色调映射的亮度图像被缩小。 对数亮度和对数全局色调映射亮度图像产生对数比图像。 多尺度分辨率过滤对数比图像生成日志多尺度比例图像。 日志多尺度比例图像和对数亮度产生第二对数色调映射图像，其被归一化以基于缩小的对数全局色调映射亮度图像和标准化图像输出色调映射图像。 HDR输入图​​像和输出色调映射图像生成第二比例图像，其被量化。

    Encoding, decoding, and representing high dynamic range images
    3.
    发明授权
    Encoding, decoding, and representing high dynamic range images 有权

    公开(公告)号：US08508617B2

    公开(公告)日：2013-08-13

    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: H04N9/73 ,  H04N3/14 ,  H04N5/46 ,  G06K9/40 ,  G06K9/00

    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.

    IMAGE PROCESSING FOR HDR IMAGES
    4.
    发明申请
    IMAGE PROCESSING FOR HDR IMAGES 有权
    HDR图像的图像处理

    公开(公告)号：US20150206295A1

    公开(公告)日：2015-07-23

    申请号：US14239047

    申请日：2013-07-31

    Applicant: DOLBY LABORATORIES LICENSING CORPORATION

    Inventor： Ankur Shah ,  Ajit Ninan ,  Wenhui Jia ,  Huiming Tong ,  Qiaoli Yang

    IPC: G06T5/00 ,  H04N19/182 ,  H04N19/117 ,  H04N19/124 ,  H04N19/186

    CPC classification number: H04N19/136 ,  G06K9/4652 ,  G06T5/009 ,  G06T5/50 ,  G06T7/90 ,  G06T2207/20008 ,  G06T2207/20024 ,  G06T2207/20208 ,  H04N19/117 ,  H04N19/119 ,  H04N19/124 ,  H04N19/182 ,  H04N19/184 ,  H04N19/186 ,  H04N19/33 ,  H04N19/44 ,  H04N19/46

    Abstract: Image encoding is described. Log-luminances in an HDR input image are histogrammed to generate a tone-map, along with which a log global tone-mapped luminance image is computed. The log global tone-mapped luminance image is downscaled. The log-luminances and the log global tone-mapped luminance image generate a log ratio image. Multi-scale resolution filtering the log ratio image generates a log multi-scale ratio image. The log multi-scale ratio image and the log luminances generate a second log tone-mapped image, which is normalized to output a tone-mapped image based on the downscaled log global tone-mapped luminance image and the normalized image. The HDR input image and the output tone-mapped image generate a second ratio image, which is quantized.

    Abstract translation: 描述图像编码。 对HDR输入图​​像中的对数亮度进行直方图，以生成色调图，并计算出对数全局色调映射的亮度图像。 日志全局色调映射的亮度图像被缩小。 对数亮度和对数全局色调映射亮度图像产生对数比图像。 多尺度分辨率过滤对数比图像生成日志多尺度比例图像。 日志多尺度比例图像和对数亮度产生第二对数色调映射图像，其被归一化以基于缩小的对数全局色调映射亮度图像和标准化图像输出色调映射图像。 HDR输入图​​像和输出色调映射图像生成第二比例图像，其被量化。

    Multi-resolution multi-view video rendering
    5.
    发明授权
    Multi-resolution multi-view video rendering 有权

    公开(公告)号：US11849104B2

    公开(公告)日：2023-12-19

    申请号：US17849790

    申请日：2022-06-27

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Haricharan Lakshman ,  Wenhui Jia ,  Jasper Chao ,  Shwetha Ram ,  Domagoj Baricevic ,  Ajit Ninan

    IPC: H04N13/351

    CPC classification number: H04N13/351

    Abstract: A device and method for video rendering. The device includes a memory and an electronic processor. The electronic processor is configured to receive, from a source device, video data including multiple reference viewpoints, determine a target image plane corresponding to a target viewpoint, determine, within the target image plane, one or more target image regions, and determine, for each target image region, a proxy image region larger than the corresponding target image region. The electronic processor is configured to determine, for each target image region, a plurality of reference pixels that fit within the corresponding proxy image region, project, for each target image region, the plurality of reference pixels that fit within the corresponding proxy image region to the target image region, producing a rendered target region from each target image region, and composite one or more of the rendered target regions to create video rendering.

    Multi-resolution multi-view video rendering
    10.
    发明授权
    Multi-resolution multi-view video rendering 有权

    公开(公告)号：US11375178B2

    公开(公告)日：2022-06-28

    申请号：US16809397

    申请日：2020-03-04

    Applicant: Dolby Laboratories Licensing Corporation

    Inventor： Haricharan Lakshman ,  Wenhui Jia ,  Jasper Chao ,  Shwetha Ram ,  Domagoj Baricevic ,  Ajit Ninan

    IPC: H04N13/351

    Abstract: A device and method for video rendering. The device includes a memory and an electronic processor. The electronic processor is configured to receive, from a source device, video data including multiple reference viewpoints, determine a target image plane corresponding to a target viewpoint, determine, within the target image plane, one or more target image regions, and determine, for each target image region, a proxy image region larger than the corresponding target image region. The electronic processor is configured to determine, for each target image region, a plurality of reference pixels that fit within the corresponding proxy image region, project, for each target image region, the plurality of reference pixels that fit within the corresponding proxy image region to the target image region, producing a rendered target region from each target image region, and composite one or more of the rendered target regions to create video rendering.

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