Evaluation of Model Patterns of Rust Spot Distribution by Image Analysis

Abstract

In order to establish a standard method to identify distribution pattern of corroded surface, a computer aided image analysis has been applied. A standardized method to get a constant input image for the image analyzer was established by using a standard scale. Model patterns showing random, regular and clustered mode, which had been given by Masuko, were analyzed by 5 indexes; variance to mean ratio, homogenuity function, index of clumping, index of mean crowding and index of patchiness. The most effective index to differentiate, the three modes of patterns was found to be the variance to mean ratio.