31. The method of claim 29 , wherein the feature information includes the location and number of disconnected dots.
31. The method of claim 29 , wherein the feature information includes the location and number of disconnected dots. 34. The method of claim 31 , wherein the feature information further includes a maximum horizontal zero crossing feature, ƒ mzh , and a maximum vertical zero crossing feature, ƒ cr and ƒ mzv .