公开(公告)号：US20170140513A1

公开(公告)日：2017-05-18

申请号：US15344785

申请日：2016-11-07

Applicant: Dolby Laboratories Licensing Corporation

Inventor： Guan-Ming SU ,  Amin KHERADMAND

IPC: G06T5/40 ,  H04N5/357 ,  G06T5/00 ,  G06T11/60

CPC classification number: G06T5/40 ,  G06T5/007 ,  G06T5/50 ,  G06T11/60 ,  G06T2207/10024 ,  G06T2207/20208 ,  G06T2207/20221 ,  H04N5/357

Abstract: An image processing device receives one or more forward reshaped images that are generated by an image forward reshaping device from one or more wide dynamic range images based on a forward reshaping function. The forward reshaping function relates to a backward reshaping function. The image processing device performs one or more image transform operations on the one or more forward reshaped images to generate one or more processed forward reshaped images without performing backward reshaping operations on the one or more reshaped images or the one or more processed forward reshaped images based on the backward reshaping function. The one or more processed forward reshaped images are sent to a second image processing device.

公开(公告)号：US20190104309A1

公开(公告)日：2019-04-04

申请号：US16139965

申请日：2018-09-24

Applicant: DOLBY LABORATORIES LICENSING CORPORATION

Inventor： Guan-Ming SU ,  Amin KHERADMAND ,  Navaneeth KAMBALLUR KOTTAYIL

IPC: H04N19/124 ,  H04N19/176 ,  H04N19/11 ,  H04N19/37 ,  H04N19/14 ,  H04N19/36

Abstract: Input minimal noise levels of are computed over input codeword bins based on image content in input images of an input bit depth. The minimal noise levels are adjusted to generate approximated minimal noise levels of a higher bit depth. The approximated minimal noise levels are used to generate per-bin bit depths over the input codeword bins. The input codeword bins are classified into first codeword bins that have relatively high risks of banding artifacts and some other input codeword bins that have relatively low or zero risks of banding artifacts based on the per-bin bit depths. Portions of bit depths from the other input codeword bins are moved to the first input codeword bins to generate modified per-bin bit depths. A forward reshaping function constructed from the modified per-bin bit depths is used to reshape the input images into reshaped images used to generate output images.