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The purpose of this study was to develop a prototype of an automatic scoring system for handwritten lines of magnetic field. It’s difficult to score automatically for handwritten lines by image recognition method. In this paper, a new method was proposed to score handwritten lines generated by the virtual magnetic source attached on a paper. It’s effective educational method for learners to be assessed for their handwritten lines generated by some magnetic sources at any points on the paper. It is, however, labor works for their teacher of his class to score with accuracy within the class constrained by time. The new system can compare a tangential line of handwritten lines with calculated lines. The system needs a conventional Windows PC, a white paper, and small circle seals. As the first step, the learner attaches some seals with two types of color on a white paper. The seals indicate two kinds of virtual point magnetic charges on the paper. As the second step, the learner imagines the lines of magnetic force on the paper and draws the lines by using his black pencil. After the handwritten paper is scanned by using scanner, the positions of the magnetic charges are searched by image recognition and calculated the two dimensional distribution of magnetic field. Finally, the tangible line was compared for each pixel point on the line and the degree of coincidence with ideal tangential lines at each pixel was calculated to score the lines written by the learner. As a result, it was confirmed that the system can automatically create a graphic composite image proportional to the score on each hand writing lines based on scanned original paper image for the case of dipole field.

Automatic Scoring System for Lines of Magnetic Force Written by a Learner's Hand