Real-time contrast preserving decolorization

Decolorization, also known as color-to-gray, plays a vital role in digital printing, monotone e-paper display and single channel image processing. While recent research focuses on retaining as much as possible meaningful visual features and color contrast, less attention has been paid to the speed issue of the conversion. Consequently, the resulting decolorization methods are typically orders of magnitude slower than standard procedures such as matlab rgb2gray function, which largely hinders their practical use.