Movement measuring apparatus for pantograph, has pantograph width filtering section configured to keep in white, one point of edge and to bring other points to become black, and to consider remaining white points as pantograph trace

摘要

The apparatus has a line sensor, and a pantograph width filtering section configured to define a white point, where a pixel passes from black to white following binary image lines and to define a white point where the pixel passes from white to black following the lines. The section is configured for keeping in white, one of points of top or bottom edge when a space between the points following the lines is comprised inside a tolerance interval and for bringing other points to become black. The section is configured for considering remaining white points as a pantograph trace.