GRAY LEVEL FACTORS USED IN IMAGE PROCESSING OF TWO-DIMENSIONAL DROP IMAGES

Abstract

This paper describes how the threshold gray level should be chosen for accurate measurements of polydispersed spray drops in using image sensing or image processing techniques. For this purpose, reference pictures were prepared to simulate the photographs of spray drops with various sizes based on the Rosin-Rammler and upper-limit distribution functions. Graphical correlations between the optimum threshold level and the distribution parameters are proposed, and a guideline for using those results is provided.