The rapid diffusion of mobile devices (telephones, smart phones, tablets, etc.) has brought new advanced features developed specifically for these devices. For example it is now possible to publish directly the pictures obtained by the integrated camera of a smart phone to our social network accounts, or to image hosting services, etc. It is therefore important to have tools on the mobile devices that can prove the ownership of the pictures and to use them before publishing the images. A common approach to guarantee ownership of digital images or videos is to use Digital Watermarking techniques. We have developed a tool for portable devices based on Android OS, that permits to add a visible or invisible watermark to images. In this paper we discuss this tool, and we experimentally prove its robustness.
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