Patent ID: 9467704
Filing Date: 2016-10-11
CPC Classification: G06K,G06T,H04N

Claim Text:
1. A method to code a high dynamic range (HDR) image with a processor, the method comprising: receiving an input image with a first dynamic range; generating a tone-mapped image based on the input image, wherein the tone-mapped image has a dynamic range lower than the first dynamic range; generating a ratio image (Y applying an invertible function (F) to the ratio image to generate a modified ratio image (F(Y generating a look-up table to represent the inverse of the invertible function (F generating a coded HDR image based on the tone-mapped image and the modified ratio image, wherein the invertible function is selected so that when applying its inverse to the modified ratio image, the distance between the ratio image and the approximation of the ratio image is minimized according to a predetermined measure.