Digital image processing (2nd ed.)
Digital image processing (2nd ed.)
Regular Feature Extraction for Recognition of Braille
ICCIMA '99 Proceedings of the 3rd International Conference on Computational Intelligence and Multimedia Applications
Recognition of Ethiopic braille characters
Proceedings of the International Conference on Management of Emergent Digital EcoSystems
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There is a significant need for a system to recognize Braille documents in order to preserve them and make them available to a larger group of visually impaired people. We introduce a high-adaptive Braille documents parameters estimation method to automatically determine the skewness, indentations, and spacing in both vertical and horizontal directions. The key element in determining the skewness of the images is based on Radon transform, which is generated from the integral of a function over straight lines, and is nicely applied in this case since Braille documents are highly directional. We demonstrate the effectiveness of skewness correction as well as the accuracy of indentation and spacing in both orientations. The proposed algorithm is an essential component of character recognition of Braille document discussed in this paper.