1. The History of OCR;Schantz,1982
2. Visual pattern recognition by moment invariants;Hu;IRE Trans. Inform. Theory,1962
3. Digital pattern recognition by moments;Alt,1962
4. A Method of Recognizing Single Strings of Nontouching Rotated Characters;Southard;Master's thesis, Ohio State University, Report AFOSR-TR-75-0177,1974
5. Vision systems eye real-time speeds through multiprocessor architectures;Goshorn;Electronics,1983