关键词: 全息干涉技术, 数字图像处理, 图像重建, 图像加密和水印

Abstract: In previous image watermarking methods, an encoded host image and a watermark image are usually directly added.Therefore, the two images have cross-talk in the decryption step.In order to eliminate this effect，a new method based on digital holography interferometry is proposed,in which all the image pixels of the two sets of holograms resulted from two hidden images are rearranged and integrated into one set of composite holograms with a random scattering matrix (RSM)．In decryption the use of this matrix can ensure the exact retrieval of each hologram，and then the perfect reconstruction of each image without cross-talk noise can be achieved．In the decryption process, the use of RSM can ensure the accurate recovery of each holographic image, so as to achieve a perfect reconstruction of no crosstalk noise in each image. The computer simulation is performed using phase-shift interference and double random phase encoding techniques to verify the feasibility of the method , its robustness to occlusion and additional noise.this method is suitable for 2D and 3D images, and the additional RSM can also provide a higher level of security as a key.

Key words: Holographic interferometry, Digital image processing, Image reconstruction, Image encryption and watermarking