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Little research has been carried out on specialized wearable input interfaced designs to assist memory impaired senior citizens. This paper proposes and implements PiTaSu (Picture based Tapping on wall Surfaces) to realize a direct input interface system to offer visual feedback and tactile feedback. PiTaSu is based on a pictorial based Augmentative and Alternative Communication (AAC) system. PiTaSu consists of a body-worn or shoulder-attached mobile projector, a camera and an accelerometer wrist band. The projector shows information that will help assist the memory impaired senior citizen in their daily task. The camera and the accelerometer detect a tapping position and tapping trigger. Experimental results have demonstrated that a senior citizen can use PiTaSu without learning special skills, and the projection based user interface has potential. Therefore, PiTaSu can assist memoryimpaired senior citizens as a daily task reminder.

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Projector-camera (ProCam) systems have a potential to become popular and affordable as they can create interactive surfaces for example on tabletops, walls, household items or on a palm of a hand. The possibility that these systems will be used at homes in the future is increasing. The elderly living alone at home often need assistance in their daily tasks as the likelihood of cognitive and motor skill related impairments increases with age. ProCam systems could be used for guidance due to easy to manipulate large interaction surfaces, but research on its suitability for elderly users is scarce. Our research focus is on elderly users and examining their characteristics as potential users of ProCam systems and the implications for interaction design. We conducted a user study with a mixed impairments group of elderly aged 82-94 to investigate how a personalized and skill-suited user interface should be designed. In our qualitative approach, we discovered that the combinations of both cognitive and motor skill deficiencies of the elderly prohibit one-for-all designs so the user interface design should be adapted to each individual's interaction skills. Lastly, we make suggestions for designing ProCam interaction for elderly.