Patent ID: 8107756

Claim:
A digital image tone remapping method, comprising the steps of: computing an average luminance value of a digital image by an image analysis device; generating a preliminary tone mapping function according to said average luminance value by a preliminary tone mapping function generating device, where the preliminary tone mapping function remaps a luminance value greater than said average luminance value through a first local mapping function T1(X)=(Cmax−X)*(X−APL)/Cmax+X, wherein Cmax represents a maximum code value under current bit resolution, X represents said luminance value and APL represents said average luminance value; generating a luminance statistic of said digital image by the image analysis device; determining new remapped values for a plurality of skeleton luminance values according to said preliminary tone mapping function and said luminance statistic by a remapped value adjusting device; generating a final tone mapping function according to said new remapped values and said plurality of skeleton luminance values by a final tone mapping function generating device; and remapping said digital image through said final tone mapping function by an image remapping device.