Satellite images watermarking based on wavelet technique

The huge development of new technologies and the apparition of more and more sophisticated open communication system creates a new challenge to protect digital content from piracy. Digital watermarking is a research axis and a new technique suggested as a solution to these problems. This technique consists of inserting an identification information (watermark) into digital data (audio, video, image, databases...) in an invisible and indelible manner and in such a way not to degrade original medium´s quality. Moreover, we must be able to correctly extract the watermark despite the deterioration of the watermarked medium (i.e. attacks). In this paper we propose a system for watermarking satellite images. We chose to embed the watermark into frequency domain, precisely the discrete wavelet transform (DWT). We applied our algorithm on satellite images of Tunisian center. The experiments show satisfying results. In addition, our algorithm showed an important resistance facing different attacks, notably the compression (JPEG, JPEG2000), the filtering, the histogram´s manipulation and geometric distortions such as rotation, cropping, and scaling