A METHOD AND APPARATUS FOR INVERSE-TONE MAPPING A PICTURE

摘要

The present disclosure generally relates to a method and device for inverse-tone mapping a picture. The method comprising: - obtaining (20) a first component (Y) comprising: - obtaining a luminance component (L) from said color picture; - obtaining a resulting component by applying (20), a non-linear function on said luminance component (L) in order that the dynamic of the resulting component is increased compared to the dynamic of the luminance component (L) - obtaining (50) a modulation value (Ba) from the luminance of said color picture; - obtaining the first component (Y) by multiplying said resulting component by said modulation value (Ba); - obtaining two chrominance components (C1, C2) from said color picture; - obtaining (40) a first factor (r(L(i))) that depends on the value (L(i)) of a pixel (i) of said luminance component (L); - obtaining (30) at least one color component (Ec) from said first component (Y), said two chrominance components (C1, C2) and said first factor (r(L(i))); and - forming the inverse-tone mapped color picture by combining together said at least one color component (Ec).