Abstract
In this study, with the aim of measuring the tooth profile error of minute module gears rapidly and precisely, a new measuring method that applies the optical cutting method is developed. This report considers about image processing method to get the tooth profiles exactly. Applying the Laplacian filter to the optical cutting images grayed into 256 levels has effect of emphasizing edges of image, and values of the threshold level become less effective to get binary images. Consequently, the medial lines of the images also can be extracted from the binary images in independence of the threshold levels. This could improve stability and reliability of measurements.
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