Equipment for the study in braille of operating processes reading

The device described in this paper measures the spatial coordinates of the fingers of blind readers decoding texts written in braille. A light-emitting diode is fixed onto each of the two reading fingers, and a television camera with a MOS pickup device delivers a signal from which is extracted the information required to deduce the vertical and horizontal coordinates of the fingers. The results of these measurements appear as eight-digit binary numbers available for real-time computer data processing.