A procedure for recognition of connected handwritten numerals
Swapan Kr. Parui, B.B. Chaudhuri, D. Dutta Majumder · International Journal of Systems Science · 1982
Syntactic methods for segmentation of connected handwritten numerals and for recognition of individual handwritten numerals are described. In the first part the size of individual numerals present in. the same chain of connected numerals is required to be nearly uniform. But the recognition procedure for individual numerals is invariant under shape and size. After segmentation and before recognition handwritten numerals are divided into two groups. Handwritten numerals consisting mainly of curves form one group while those consisting of vertical and horizontal strokes form the other. Recognition procedures for the two groups are different but similar. In both cases, for recognition of a numeral only the information about its border is made use of. The extracted border is in fact a sort of skeleton of the numeral pattern and is stored in one-dimensional strings of eight direction codes. On the basis of these one-dimensional strings certain subpatterns are recognized through some automata. The numeral pattern is ultimately recognized from these subpatterns. The method was implemented on an EC 1033 machine with a success rate of about 90%