US 12,301,848 B2
Adaptive streaming with false contouring alleviation
Neeraj J. Gadgil, Pune (IN); Guan-Ming Su, Fremont, CA (US); and Harshad Kadu, Santa Clara, CA (US)
Assigned to DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
Appl. No. 18/020,015
Filed by DOLBY LABORATORIES LICENSING CORPORATION, San Francisco, CA (US)
PCT Filed Aug. 5, 2021, PCT No. PCT/US2021/044811
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/032010, PCT Pub. Date Feb. 10, 2022.
Claims priority of provisional application 63/061,937, filed on Aug. 6, 2020.
Claims priority of application No. 20189859 (EP), filed on Aug. 6, 2020.
Prior Publication US 2023/0308667 A1, Sep. 28, 2023
Int. Cl. H04N 19/36 (2014.01); H04N 19/132 (2014.01); H04N 19/186 (2014.01); H04N 19/46 (2014.01)
CPC H04N 19/36 (2014.11) [H04N 19/132 (2014.11); H04N 19/186 (2014.11); H04N 19/46 (2014.11)] 15 Claims
OG exemplary drawing
 
1. A method for encoding an image into a video signal, comprising:
in a first stage, performing:
generating a forward reshaping mapping to map a source image of a first dynamic range to a corresponding forward reshaped image of a second dynamic range lower than the first dynamic range; and
in a second stage, performing:
generating, by spatially downsampling the source image of the first dynamic range, an image of the first dynamic range and of a first spatial resolution;
computing, using the forward reshaping mapping, a luminance-dependent noise strength;
injecting noise with the luminance-dependent noise strength into the image of the first dynamic range and of the first spatial resolution to generate a noise injected image of the first dynamic range and the first spatial resolution;
applying the forward reshaping mapping to map the noise injected image of the first dynamic range and the first spatial resolution to generate a noise embedded image of the second dynamic range and the first spatial resolution; and
encoding into a video signal the noise embedded image of the second dynamic range and the first spatial resolution.