Reducing banding artifacts in backward-compatible HDR imaging

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United States of America

PATENT NO 11277646
APP PUB NO 20210368212A1
SERIAL NO

17282523

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Methods and systems for reducing banding artifacts when displaying high-dynamic-range images reconstructed from coded reshaped images are described. Given an input image in a high dynamic range (HDR) which is mapped to a second image in a second dynamic range, banding artifacts in a reconstructed HDR image generated using the second image are reduced by a) in darks and mid-tone regions of the input image, adding noise to the input image before being mapped to the second image, and b) in highlights regions of the input image, modifying an input backward reshaping function, wherein the modified backward reshaping function will be used by a decoder to map a decoded version of the second image to the reconstructed HDR image. An example noise generation technique using simulated film-grain noise is provided.

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Patent OwnerAddress
DOLBY LABORATORIES LICENSING CORPORATION1275 MARKET STREET SAN FRANCISCO CA 94103

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gadgil, Neeraj J San Jose, US 18 27
Raj, Arun Santa Clara, US 7 14
Song, Qing Sunnyvale, US 36 191
Su, Guan-Ming Fremont, US 134 1257
Yin, Peng Ithaca, US 454 9299

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