Optical 3D watermarking and authentication by correlation techniques
Sherif E. Kishk, Bahram Javidi · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2004
We present an optical method for information watermarking of 3D objects using digital holography and authenticating the hidden image. A hidden image is embedded using double phase encoding in a phase shift digital hologram of the 3D object. The watermarked hologram is decoded to reconstruct the hidden image and the 3D object. We use either the entire hologram or a part of it to decode the hidden image. The recovered hidden image is authenticated using non-linear correlation. Experiments are presented to illustrate the ability to recover both the 3D object and the decoded hidden image.