US Patent No. 10,992,936


Patent No. 10,992,936
Issue Date April 27, 2021
Title Encoding, Decoding, And Representing High Dynamic Range Images
Inventorship Wenhui Jia, Dublin, CA (US)
Ajit Ninan, San Jose, CA (US)
Arkady Ten, Sunnyvale, CA (US)
Gregory John Ward, Berkeley, CA (US)
Assignee Dolby Laboratories Licensing Corporation, San Francisco, CA (US)

Claim of US Patent No. 10,992,936

1. A method for encoding high-dynamic range images with a processor, the method comprising:receiving a high dynamic range (HDR) image;
generating a tone-mapped image based on the HDR image;
generating a luminance ratio image based on pixel luminance values of the HDR image and pixel luminance values of the tone-mapped image;
determining residual chroma values based on the luminance ratio image, the HDR image and the tone-mapped image;
generating a log ratio image based on the luminance ratio image; and
generating a coded HDR image, the coded HDR image comprising the tone-mapped image and HDR reconstruction data, the HDR reconstruction data being derived based the log ratio image and the residual chroma values.