| 摘要 |
PROBLEM TO BE SOLVED: To provide technology for suppressing unauthorized copy of an image by tele sink. SOLUTION: A display image output device 100 outputs a moving image and a still image as a display image. A display image projector 200 projects the display image outputted from the display image output device 100 on a screen 500. A watermark conversion image output device 300 generates a watermark image in which watermark information is arranged, generates and outputs a watermark conversion image in which the watermark information is converted into a state that it can not be visually recognized by performing specific conversion to the watermark image. A watermark conversion image projector 400 projects the watermark conversion image outputted from the watermark conversion image output device 300 on the screen 500. The display image projected by the display image projector 200 and the watermark conversion image projected by the watermark conversion image projector 400 are optically superimposed on the screen 500 and as a result, the watermark information is optically embedded in the display image. COPYRIGHT: (C)2004,JPO&NCIPI |
