COLOR SATURATION ENHANCEMENT

摘要

A method of color saturation enhancement comprises receiving (1) an input image (II) composed of pixels. At least three scales (SC0, SC1, SC2) are generated (2), the lowest ranked scale (SC0) being the input image (II), the lowest but one ranked scale (SC1) being a low-pass filtered version of the input image (II), the lowest but two ranked scale (SC2) being a low-pass filtered version of the lowest but one scale (SC1) or a low passed version of the input image (II) being stronger low-pass filtered than the input image (II) for the lowest but one scale (SC1). The color pixel values (Pxy(0), Pxy(1), Pxy(2)) of a particular pixel (Pxy) of the input image (II) in different scales (SC0, SC1, SC2) are compared (3) to obtain comparison values (CVi). Weights (w0, w1, w2) are allocated (4) to the scales (SC0, SC1, SC2) for favoring a first color pixel value (Pxy(l)) of the particular pixel (Pxy) in one of the scales (SC1) over a second color pixel value (Pxy(2)) of the particular pixel (Pxy) in another one of the scales (SC2) having a higher rank if the first color pixel value (Pxy(l)) and the second color pixel value (Pxy(2)) differ more than a predetermined amount, and for favoring the second color pixel value (Pxy(2)) over the first color pixel value (Pxy(1)) if the first pixel color value (Pxy(l)) and the second pixel color value (Pxy(2)) differ less than the predetermined amount. The color pixel values (Pxy(0), Pxy(1), Pxy(2)) of the particular pixel (Pxy) of the different scales (SC0, SC1, SC2) are combined (5) weighted in accordance with the allocated weights (w0, w1, w2).