Objective evaluation of printed matter was studied briskly early in the 1980's. At a simultaneous period, (Formerly) Kanzaki Paper Co., Ltd. ((Currently) Oji Paper Co., Ltd.) worked on the research of numerical evaluation concerned with printed matter and developed the inspection device of missing dots for photogravure printing. Afterwards we developed the inspection device of offset printed matter, sheet formation, paper dirt and deinking sheet etc. then these accumulated technology achieved the special purpose machine APQS (Automated Print Quality Evaluation System) based on our domestic image processing analysis system “Dot Analyzer DA-6000”. In this report, we introduce details until developing, outline and algorithms concerned with APQS.
