公开(公告)号：US10027963B2

公开(公告)日：2018-07-17

申请号：US15035551

申请日：2014-11-10

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming Su ,  Qian Chen ,  Bongsun Lee ,  Scott Daly

IPC: H04N19/146 ,  H04N19/117 ,  H04N19/30 ,  H04N19/124

Abstract: An encoder receives an input enhanced dynamic range (EDR) image and a corresponding lower dynamic range (LDR) image to be coded at a given target rate. Before coding, a pre-dithering process is applied to the input LDR image to generate a dithered LDR image at a second bit depth, lower than its original bit depth. The pre-dithering process includes: generating uniformly-distributed noise, applying a spatial filter to the noise to generate low-pass or high-pass filtered noise, applying a temporal high pass or low pass filter to the spatially-filtered noise to generate output noise, adding the output noise to the input LDR image to generate a noise-enhanced LDR image, and quantizing the noise-enhanced image to generate the dithered LDR image. Selecting the characteristics of the dithering filters is based on both the target bit rate and luminance characteristics of the pixels in the input LDR image.

公开(公告)号：US09762876B2

公开(公告)日：2017-09-12

申请号：US14888058

申请日：2014-04-02

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Scott Daly ,  Bongsun Lee

IPC: H04N9/64 ,  H04N19/00 ,  H04N1/64 ,  H04N9/68 ,  G09G3/20 ,  G09G5/02 ,  G09G5/10 ,  H04N19/90

CPC classification number: H04N9/646 ,  G09G3/2003 ,  G09G3/2048 ,  G09G5/026 ,  G09G5/10 ,  G09G2340/02 ,  G09G2340/06 ,  H04N1/646 ,  H04N9/68 ,  H04N19/90

Abstract: Dithering techniques for images are described herein. An input image of a first bit depth is separated into a luma and one or more chroma components. A model of the optical transfer function (OTF) of the human visual system (HVS) is used to generate dither noise which is added to the chroma components of the input image. The model of the OTF is adapted in response to viewing distances determined based on the spatial resolution of the chroma components. An image based on the original input luma component and the noise-modified chroma components is quantized to a second bit depth, which is lower than the first bit depth, to generate an output dithered image.

公开(公告)号：US09607364B2

公开(公告)日：2017-03-28

申请号：US15035477

申请日：2014-11-19

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Ning Xu ,  Tao Chen ,  James E. Crenshaw ,  Timo Kunkel ,  Bongsun Lee

IPC: G06T5/00 ,  G06T5/40 ,  H04N1/60 ,  H04N1/407 ,  G06T7/90

CPC classification number: G06T5/007 ,  G06T5/40 ,  G06T7/90 ,  G06T2207/20016 ,  G06T2207/20028 ,  G06T2207/20208 ,  H04N1/4072 ,  H04N1/6027

Abstract: Novel methods and systems for inverse tone mapping are disclosed. A scene can be analyzed to obtain highlight detection from bright light sources and specular reflections. An inverse tone mapping curve can be calculated based on the lower dynamic range and higher dynamic range displays. Multi-scale filtering can be applied to reduce noise or artifacts.

公开(公告)号：US10977849B2

公开(公告)日：2021-04-13

申请号：US16674373

申请日：2019-11-05

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Timo Kunkel ,  Ning Xu ,  Tao Chen ,  Bongsun Lee ,  Samir N. Hulyalkar

IPC: G06T11/60 ,  H04N21/431 ,  H04N5/445 ,  H04N21/81 ,  H04N5/272 ,  H04N21/462 ,  G09G5/10 ,  G06T7/90 ,  G06K9/46 ,  G06K9/52 ,  G06K9/62 ,  H04N5/58 ,  H04N9/67 ,  H04N21/41 ,  H04N21/422 ,  H04N21/488 ,  G06F3/14

Abstract: Systems and methods for overlaying a second image/video data onto a first image/video data are described herein. The first image/video data may be intended to be rendered on a display with certain characteristics—e.g., HDR, EDR, VDR or UHD capabilities. The second image/video data may comprise graphics, closed captioning, text, advertisement—or any data that may be desired to be overlaid and/or composited onto the first image/video data. The second image/video data may be appearance mapped according to the image statistics and/or characteristics of the first image/video data. In addition, such appearance mapping may be made according to the characteristics of the display that the composite data is to be rendered. Such appearance mapping is desired to render a composite data that is visually pleasing to a viewer, rendered upon a desired display.

公开(公告)号：US10055866B2

公开(公告)日：2018-08-21

申请号：US14768345

申请日：2014-01-27

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Timo Kunkel ,  Ning Xu ,  Tao Chen ,  Bongsun Lee ,  Samir N. Hulyalkar

IPC: G06T7/90 ,  G06T11/60 ,  H04N5/58 ,  H04N21/41 ,  H04N21/422 ,  H04N21/431 ,  H04N9/67 ,  G06K9/46 ,  G06K9/52 ,  G06K9/62 ,  G06F3/14

CPC classification number: G06T11/60 ,  G06F3/1454 ,  G06K9/4652 ,  G06K9/4661 ,  G06K9/52 ,  G06K9/6201 ,  G06T7/90 ,  G09G2320/08 ,  G09G2360/144 ,  H04N5/58 ,  H04N9/67 ,  H04N21/4122 ,  H04N21/42202 ,  H04N21/4318

Abstract: Systems and methods for overlaying a second image/video data onto a first image/video data are described herein. The first image/video data may be intended to be rendered on a display with certain characteristics—e.g., HDR, EDR, VDR or UHD capabilities. The second image/video data may comprise graphics, closed captioning, text, advertisement—or any data that may be desired to be overlaid and/or composited onto the first image/video data. The second image/video data may be appearance mapped according to the image statistics and/or characteristics of the first image/video data. In addition, such appearance mapping may be made according to the characteristics of the display that the composite data is to be rendered. Such appearance mapping is desired to render a composite data that is visually pleasing to a viewer, rendered upon a desired display.