Holographic approach to embedding hidden watermarks in a photographic image
Abstract
This paper presents a holographic approach to embedding hidden watermarks in photographic images. A physical interpretation is given of the processes of embedding and visualizing hidden watermarks. It is established that a Fourier transformation of watermarks embedded in the frequency domain with a shift relative to the coordinate origin is a digital Fourier hologram. An optimized method is developed for introducing watermarks, based on a Fourier hologram with a single sideband. Experimental studies on typical photographic equipment showed stable reconstruction of watermarks for Fourier holograms.
- Publication:
-
Journal of Optical Technology
- Pub Date:
- June 2005
- Bibcode:
- 2005JOptT..72..464S