Review of Optical Braille Recognition Using Camera for Image Acquisition

Optical Braille Recognition (OBR) is a process used to recognize documents that contain Braille characters and to translate them into other characters. Several methods have been proposed for OBR, where each of them has advantages and disadvantages. Basically, OBR methods consist of several steps: image acquisition, image pre-processing, Braille dot detection, Braille cell segmentation and translation. Among the methods that have been proposed, one of the differences is the image acquisition techniques that use either scanners or cameras to capture images. This paper reviews several OBR methods that use camera on image acquisition process. Thus, it can be used as a reference for the development of future OBR.