Gradient domain salience-preserving color-to-gray conversion
Bingfeng Zhou, Jie Feng · 2012
In this paper an algorithm for gradient domain color-to-gray conversion is described. By enhancing the luminance gradient with the chromatic difference in CIELAB space, a gradient field is created to construct the resulting gray-scale image using a Poisson equation solver. In our algorithm, we develop a modulated luminance gradient enhancement to produce artifact-free and salience-preserving grayscale images. A gradient sign control function is defined for isoluminance color images to keep the correct color ordering.