Non-Photorealistic Halftoning by Mean Color-Preserving Contrast Enhancement

We propose a method for non-photorealistic halftoning by mean color-preserving contrast enhancement. The proposed method enhances the contrast between two colors adjacent to each other on an image plane, while keeping their mean color constant. Inspired by ceremonial two-tone paper cords used in Japan, we apply the proposed contrast enhancement method to the generation of weaving patterns of paper cords on output images. In our experiment, we show non-photorealistically halftoned images with three kinds of weaving patterns: plain, twill and Dutch weavings that are further enhanced by a gamma correction-based method, and demonstrate the coexistence of the weaving patterns and the original appearance of input images on the resultant halftone images.