HOLOMARKING: DIGITAL WATERMARKING METHOD USING FRESNEL HOLOGRAM

摘要

PURPOSE: Holomarking: digital watermarking method using a Fresnel hologram is provided to perform the PC or digital watermarking algorithm-based electronic holomark extraction and the optical extraction optical system using an optical system at the same time. CONSTITUTION: An SLM(Spatial Light Modulator) is connected to a PC(Personal Computer), and an image including a holomark is displayed on the SLM. An optical system is used to irradiate a reference wave to the image. A holographic restoration image is reproduced in space. The reproduced holographic restoration image and the extracted holomark indicate the copyright for an original image. An extracted holomakr is extracted in the reverse order of an electronic watermarking insertion process.