Patent ID: 9607364
Date: 2017-03-28
CPC Classifications: G06T,H04N

Claim:
1. A method to perform inverse tone mapping, the method comprising: providing, by a computer, a luminance of an image; detecting, by a computer, highlights in the luminance, thereby obtaining a highlight detection parameter; estimating, by a computer, a mid-value of the luminance, thereby obtaining a mid-value luminance parameter; providing, by a computer, minimum and maximum luminance values for a lower dynamic range display and for a higher dynamic range display; calculating, by a computer, an inverse tone mapping curve, based on the highlight detection parameter, the mid-value luminance parameter, and the minimum and maximum luminance values for the lower dynamic range display and the higher dynamic range display; and applying, by a computer, the inverse tone mapping curve to the luminance as a global mapping operator, thereby obtaining an inversely mapped luminance.