An image data watermarking technique using the average of a Fresnel-transformed pattern

Watermarking is a technique embedding hidden information in multimedia data imperceptibly, such as image, video, audio and text data. Generally an original image is transformed and coded watermark data is embedded in frequency domain watermarking models. We propose a new image data embedding method using Fresnel transform. A watermark image is Fresnel-transformed and the values of difference between coefficients of a transformed pattern and their average are embedded into an original image. Our watermarking model allows flexibility in hiding the watermark. It is possible to get many embedding patterns from a single watermark image by using various distance parameters with the Fresnel transform. All kinds of image models, such as shapes, letters and photos, can be used as watermark data. Watermarking experiments have shown the validity of our watermarking technique and its robustness in resisting attacks