抄録
Pay-TV, which allows viewers to select the programs they want to watch, is commonly available. A viewer wants to buy a desired program after he/she understands its content. A broadcaster wants to protect a program's content and advertize during the program. Existing pay-TV service is not able to meet both requirements. We developed a method for embedding visible watermarks that satisfies both viewers and broadcasters on pay-TV. The visible watermark is embedded in a program for copyright protection and advertizing purposes. In addition, the logo of the watermark is split into two keys. The broadcaster has one key, and the other key is embedded in unnoticeable regions of the program. The broadcaster is thus able to remove the visible watermark by using the key. Furthermore, the method is resistant to attack by the removal of the visible watermark because it is changed by image features temporally. Experimental results show that understanding the content of a program is possible from a sample image. In addition, the image that is produced is comparable to the original image.
