| 摘要 |
A method and apparatus whereby it is directly and indirectly prevented that a literary work such as a cinema or a video image displayed on a display apparatus such as a theater screen or a display unit is picked up illegally by an image pickup apparatus such as a video camera and distributed. One or a plurality of changeover modes from among: changeover of the frame rate, changeover of the scanning direction, changeover of the luminance, changeover of the scanning phase, changeover of the scanning pattern, changeover of the time position of scanning, and of the scanning interval are performed as changeovers of a display operation condition so that a stripe pattern or the like is produced on a redisplayed image to deteriorate the image quality. The changeover of the display operation condition is performed based on the value of the operation condition control information, which regarding an image itself, an image display apparatus, an image display establishment, the date and hour of image display, image management or the like such that the operation condition control information can be extracted from the picked-up image.
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