Size measurement technology of seals

The rubber seals material is not rigid, and easy deformed. To realize rubber seals size measurement automatically, computer vision technology based on non-contact measurement is employed, invariant as standard of size measurement is studied. The full and smooth contour is segmented using de-noised with average template and gray thresh with iterative method, and chain code description is modified according the type of chain code connection directions; a approach of perimeter invariance is proposed to measure seals diameter parameter based on the relationship analyzed between the deformation of an ellipse and the circle; the chain code optimal weight is proposed and calculated with least square method using the standard circle, and compared with the chain code weight computed by other methods. The simulation experiments show that the size measurement algorithm achieves a high accuracy.