Development of an autonomous system shows that spatial filtering techniques improve braille recognition, indicating enhanced accessibility for the visually impaired.
The principles of relief acquisition with the use of a camera and a frame memory controlled by a microcomputer are presented. The use of spatial filtering techniques, especially polynomial filtering, followed by median filtering, erosion, and dilatation, permits the contrasted relief to be extracted from the bottom. After thresholding, an adaptive recognition method is applied, using projection of the braille characters to supply the braille-coded chain of the text.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Dubus et al. (1988) studied this question.
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