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The Dynamic Patterning System (DPS) is a narrow bandwidth GUI developed for use by people with vision impairment who cannot read even enlarged print, yet are able to distinguish a small number of colored areas on a computer screen. DPS computer program runs on standard PCs with no additional equipment required. The DPS is designed to utilize the residual vision that many people, though classified as blind, possess. It should be noted that within Western Australia people possessing 10% or less of the sight possessed by a fully sighted individual are classified as blind. This system could be of especial use to the blind-deaf rather than blind users due to the wide availability of text to speech technology. However, the problem of diagram recognition via such systems remains problematic. The authors propose a Low Speed Scanning (LSS) approach whereby users are presented with a sequence of patterns …