Abstract
Unauthorized recording in a movie theater for illegal distribution of digitized images is a serious problem. So far, information hiding techniques, such as watermarking, fingerprinting and so on, have been applied to prevent illegal duplication and distribution of digital contents. These conventional techniques can be useful for copyright protection in a limited situation of digital storage or network, however, can not inhibit unauthorized re-digitizing and duplication in the real world such as a movie theater. In this paper, we propose an unacceptable camcorder detection method, which is based on a geometrical distortion of 3 feature points on a screen. A technique like our proposal will lead to prevention against unauthorized recording.
