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Item ARK multi-utilizador(The Eurographics Association, 2021) Pereira, Pedro; Matos, Nuno; Grave, Luís; Marcos, Adérito; Marcos, Adérito and Mendonça, Ana and Leitão, Miguel and Costa, António and Jorge, JoaquimThis paper present a monitor based prototype for visualization and interaction of an Augmented Reality (AR) system. It had been recently developed at CCG and demonstrated on the conference SIACG2002 at Guimarães, Portugal. ARK – augmented reality kiosk - is a set-up based in the prototypes developed in the European project Virtual Showcases where direct interaction has been added. A normal monitor and a half-silvered mirror constitute the usual setup of the kiosk By integrating a half-silvered mirror and a black virtual hand, our solution solves the occlusion problem that normally occurs when a user interacts with a virtual environment displayed by a monitor or other projection system. Conceived with low monetary resources this portable solution can be deployed in different application contexts as for instance culture heritage. In this paper it will presented an extension of the solution to a multi-user platform for a Portuguese museum.Item Using Sketches to Edit Electronic Documents(The Eurographics Association, 2021) Coelho, Pedro; Faria, Gonçalo; Gonçalves, Daniel; Jorg, Joaquim; Marcos, Adérito and Mendonça, Ana and Leitão, Miguel and Costa, António and Jorge, JoaquimCalligraphic interfaces mimic the interaction of users with pen and paper, to which most persons are used to from an early age. This makes them a privileged way of interacting with computers in efficient and natural ways. One of the tasks more often made with pen and paper is to write and correct text documents. This is done resorting to several symbols with specific meanings, representing the changes to be made in the document. It should be possible to correct electronic texts in a similar way, using calligraphic interfaces. In this paper, we describe the CaliEdit text editor, currently being developed for PalmOS devices with that goal in mind. In its development, we followed a user-centered design approach. The task analysis phase, with the help of questionnaires, identified the most common symbols for the most common text-correcting tasks. The editor itself uses the CALI shape and gesture recognizer, ported to PalmOS, to help recognize those symbols. Several porting and implementation problems were overcome. Currently, heuristic and usability evaluation studies are underway to help validate the editor.