MARIS: Map Recognizing Input System - Implementation and Performance on a Special Workstation

interactive correction. Preprocessing and vectorization are performed in the graphic processing unit. We have proposed an automatic map recogniz- The multi-processors contribute to the enhancement ing input system called MARIS. This system digitizes of vectorization speed. Automatic recognition is perlarge-scale maps into a layered data form in order to formed on the main control unit. In this stage, buildconstruct a map database. This paper presents the ing lines, contour lines, and lines representing railsystem's implementation and performance on an ex- ways, roads and water areas are extracted. Railway perimental workstation. Experimental results show extraction is omitted in this implementation. Recogthat the input time using the MARIS system can be nition algorithms based on vector data enable highreduced to about 25 % of that of a system using an speed recognition. The recognition results are corinteractive digitizer. rected interactively through the main control unit.