Abstract:

The use of the two images collected before and after the camera image,the Hough transform,moving average,fitting handle the main scale and scale position the cursor,scale position of the cursor and the main scale comparative find alignment vernier scale,and in the case of close to a pixel size with a vernier caliper accuracy,can reduce the error effectively.

Key words: vernier caliper;Hough transform;moving average;fitting a Gaussian function