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Machine Vision, 3rd Edition by E. R. Davies

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CHAPTER 7 Boundary Pattern Analysis

7.1 Introduction

An earlier chapter showed how thresholding may be used to binarize gray-scale images and hence to present objects as 2-D shapes. This method of segmenting objects is successful only when considerable care is taken with lighting and when the object can be presented conveniently, for example, as dark patches on a light background. In other cases, adaptive thresholding may help to achieve the same end: as an alternative, edge detection schemes can be applied, these schemes generally being rather more resistant to problems of lighting. Nevertheless, thresholding of edge-enhanced images still poses certain problems; in particular, edges may peter out in some places and may be thick in others ( ...

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