Varnish Rating of Piston Skirt by Image Processing

A new method for rating the varnish of the piston skirt was developed by using image processing. The varnished area of a piston skirt was extracted from the developed color image in terms of the density and the color data. The figure of merit rating was calculated using a personal computer. The newly developed method makes it possible to rate varnish of the piston skirt automatically, quantitatively and quickly.