Efficient decolorization preserving dominant distinctions

Representing color images in grayscale has practical and theoretical importance. Current color-to-gray transformations seldom ensure both quality and efficiency simultaneously in practice. In this paper, we present an efficient global mapping from color to gray while preserving visually dominant features of color images. Our color-to-gray transformation is based on a variant of traditional Difference of Gaussians band-pass filter, which is called luminance filter. The band-pass filter usually ha