Machine Vision, 3rd Edition

CHAPTER 10 Circle Detection

10.1 Introduction

The location of round objects is important in many areas of image analysis, but it is especially important in industrial applications such as automatic inspection and assembly. In the food industry alone, a sizable proportion of products are round—biscuits, cakes, pizzas, pies, oranges, and so on (Davies, 1984c). In the automotive industry many circular components are used—washers, wheels, pistons, heads of bolts, and so on—while round holes of various sizes appear in such items as casings and cylinder blocks. In addition, buttons and many other everyday objects are round. All these manufactured parts need to be checked, assembled, inspected, and measured with high precision. Finally, objects can ...