Data hiding system by Fresnel transform

Watermarking is a technique embedding hidden multimedia information imperceptibly, such as images and sounds. Generally the original image is transformed and coded watermark data is embedded in frequency domain watermarking models. In this paper, we propose a new data embedding method using the Fresnel transform. A watermark image is Fresnel-transformed and the intensity of the transformed pattern is embedded into the original image. Our watermarking model has the flexibility in data hiding. It is possible to embed the watermark in many different observable planes with various distance parameters of the Fresnel transform and all kinds of image models such as the shape, letter or photo can be used as the watermark data