Patent ID: 8766999

Claim:
A method comprising: calculating an illumination component of an image input signal of high dynamic range by processing the input signal with a shape adaptive filter; processing the calculated illumination component to generate a processed illumination component in which a contrast of the input signal has been compressed; processing the calculated illumination component to generate a processed reflectance component in which at least one feature of the input signal has been sharpened; generating a processed input signal from the processed illumination component and the processed reflectance component, wherein the processed input signal comprises a contrast-compressed and image-sharpened version of the input signal; and mapping the processed input signal into a dynamic range of a display device, wherein calculating the illumination component further comprises: calculating the input signal's associated luminance signal by transforming a RGB input signal into a YCgCo color space; and processing the luminance signal with the shape adaptive filter to calculate the illumination component, and wherein the shape adaptive filter calculates the illumination component through the equation: L ⁡ ( x , y ) = ∑ x i , y i ∈ W ⁢ ω ⁡ ( x i , y i ) · Y ⁡ ( x i , y i ) ∑ x i , y i ∈ W ⁢ ω ⁡ ( x i , y i ) . where (x,y) are the co-ordinates of a current pixel being processed, ω(x i , y i ) are filter weights of the shape adaptive filter, Y is a luminance signal, and W is a window of pixels centered at pixel (x,y).