CHARACTER MARK PATTERN INSPECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To precisely detect an item which is to be detected as a really defective one by judging whether a character mark pattern is normal or abnormal through the use of density sum rate data against density sum data on the whole areas of partial density sum data on respective small areas where the influence of the fluctuation of the density and the thickness of characters is small. SOLUTION: A picture input part 1 converts a picture into digital data and inputs it. Then, it is stored in a picture storage part 2. A circumscribing rectangle detection function processing part 3 detects circumscribing rectangle data deciding the circumscribing rectangular frame of a character mark pattern among digital data of the picture storage part 2. A partial density sum operation function processing part 4 operates partial density sum data on the respective small areas obtained by area-dividing circumscribing rectangular data. A density sum rate operation function processing part 5 operates density sum rate data against density sum data of the whole areas of the circumscribing rectangle of partial density sum data on the respective small areas. A character mark pattern normal/defective condition function processing part 6 judges the normal/ defective condition of the character mark pattern based on density sum rate data.