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Optical character recognition is popular field for researchers during last decade of research, which is able to successfully recognize the scanned English image into editable text form. However, optical character systems for other regional languages such as Urdu, Arabic, and Sindhi, still presents a huge challenge and implementation problems. Thus, in this paper various techniques of optical character recognition system for such low level regional languages have been discussed and analyzed. This survey paper consolidates all such techniques and presents an overview to aid researcher understand the methodology of performing and implementing OCR system for Sindhi language.