A new data coding scheme using contrast-controllable color intersection

In this paper we propose a new data coding scheme called color intersection coding (CIC). The feature of the CIC is that people may not perceive particular color arrangement in encoded image at a distance, and he/she can shoot encoded image to decode hidden data at close distance. Color intersection is a key technique to generate four sub-pixels to represent a target pixel in original image, and the average color of those sub-pixels is equal to that of the target pixel. During decoding process, shot image is divided into several non-overlapping blocks, and then the average color of every block is computed. Color arrangement of four adjacent blocks is determined as well as hidden data is decoded. The experiment results demonstrate that the CIC scheme not only can control color contrast of encoded image, but also preserves content completeness of encoded image.