| 摘要 |
PURPOSE: Prints for preventing duplication and forgery of a video information encoded image according to representation of a latent image and a method for forming the prints are provided to easily judge a forgery. CONSTITUTION: A random number map is generated, and a security code is inputted. An image is inputted to a processor, and the color, size and region of the inputted image are adjusted and normalized. The normalized image is divided into R, G and B components using the random number map. The first coding of making each of the components a square puzzle is carried out. The second coding of imaging the coded information to a single-gradation map is performed. The third coding of combining the imaged information in unit of the basic components to make a square, triangle or circular puzzle or convert the basic components into a single pixel is executed. A coding key code is inserted into the coded image. Video information image is coded and inputted to a processor. Gradient correction, size correction and coding key code of the inputted image are extracted. The security code is inputted or extracted from the coded image. The image is decoded and restored.
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