Machine Vision, 3rd Edition

CHAPTER 13 Hole Detection

13.1 Introduction

The last few chapters have been particularly concerned with the direct location of objects from their shapes. Where objects have simple shapes this approach is a viable one, but in more complex situations they may have to be located from their features. In the case of larger objects and assemblies, these features may be components of the very shapes discussed so far. However, two important features have not so far been covered: these are small holes and corners. Corners are dealt with in Chapter 14. Here we will consider the location of small holes: not only can these be used to locate objects and to identify them positively, but also they are important in the task of accurately measuring object dimensions. ...