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Item Ramses: a Visual Steganographic System(The Eurographics Association, 2007) Battiato, S.; Blasi, G. Di; Gallo, G.; Patti, S.; Raffaele De Amicis and Giuseppe ContiSteganography is the art of "secret communication". Its goal is to transmit a message (information) hidden inside another visible message. The typical visible message used in many steganographic systems is a digital image and the embedded message is usually hidden by working in the Fourier domain. In this paper we present Ramses, a novel approach to the steganography based on the Puzzle Image Mosaic (PIM) technique ( [DGP05]) which uses the metaphor of the hieroglyphicwriting to hide the message in the image. Themessage is first coded by a sequence of small irregular images and then merged inside another image together with many other small images.We prove that the Kerckhoff's principle required by a steganographic technique is satisfied and experimental results show how it is very difficult to detect the hidden message.Item Modelling and Animation of Theatrical Greek Masks in an Authoring System(The Eurographics Association, 2007) Bertacchini, P. A.; Bilotta, E.; Pantano, P.; Battiato, S.; Cronin, M.; Blasi, G. Di; Talarico, A.; Tavernise, A.; Raffaele De Amicis and Giuseppe ContiThis paper describes an authoring system for modelling Greek virtual masks that express emotions for synchronising their facial movements with pre-recorded speech files, and for creating theatrical performances. The system is related to parametric modelling and includes three interfaces: Editor, Recorder and Virtual Theatre. In the Editor interface it is possible to create several different 3D masks from a unique mask basic model. In the Recorder it is possible to import the models created in the Editor and select eight expressions (neutral, anger, surprise, sadness, fear, joy, disgust, attention), as well as to create and save little alterations in these expressions, and to synchronise the facial movements with speech on the time-line of the system. In the Virtual Theatre the animated Greek masks can be imported and can perform.