Abstract
Personal handy terminals and computers have come into wide use for digital cartoons through the Internet. There will be a great distribution for digital cartoons in near future and it brings a serious problem of copyright protection because of illegal copy and use. However, we have only insufficient tools for this problem, now. This paper presents a new watermarking scheme of digital color cartoons. We pay attention to the colored region of a picture and introduce a concept of modulo computation for a group of the specified pixels with the same color vector. The watermark bit is expressed with the region of the same color vector. Our experimental results show good pictures and robust watermarks against some attacks.
