PaperCAD: A System for Interrogating CAD Drawings Using Small Mobile Computing Devices Combined with Interactive Paper

Table 1

Legal state transitions for equation HMM. digit = digits from “0” to “9”; alpha = all uppercase letters; alpha_cs = all uppercase letters except “C” and “S”; op = “+”, “−”, “”, and “/”.

“ ”, “=”	“ ”
op	digit, alpha
“(”	digit, alpha, “+”, “−”, “·”
“)”	op, “=”
“·”	digit
digit	digit, op, “=”, “)”, “·”
alpha_cs	op, “=”, “)”
“C”	op, “=”, “)”, “CO”
“S”	op, “=”, “)”, “SI”
“CO”	“COS”
“SI”	“SIN”
“SIN”, “COS”	“(”