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This work intended to develop and integrate techniques, algorithms and equipments to aid visually handicapped people with the familiarization of unknown environments, as involved in orientation and mobility techniques, making locomotion an easier task. In a second phase, it allowed the blind user to receive signals corresponding to signs with letters, allowing them to “read” these signs. In order to do that, it was proposed the sensory substitution of vision by touch. Images were captured, processed digitally to be simplified, have their edges detected (contours of objects) and have their resolution reduced. This reduced image was then passed to the user by cutaneous electro-stimulation on the abdomen. A hardware prototype was developed, as well as firmware to control it, software to digitally process the image, a flexible matrix of electrodes, and an ultrasonic distance estimation system, to compensate for the lack of stereoscopy. The system was designed to be as flexible as possible to allow several stimuli tests. Preliminary tests were conducted that proved the feasibility of this concept. A second prototype, larger, was then designed and built. This device proved valuable also as a tool for research in experimental psychology, in cognition

Sistema de substituição sensorial para auxílio a deficientes visuais via técnicas de processamento de imagens e estimulação cutânea.