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

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Hole Detection

Small holes are important features that can be used very conveniently to locate complex objects. If holes are very small, 3 × 3 or slightly larger window operators can be used to locate them. If large and circular, the Hough transform may be suitable. If of intermediate size, special fast-acting methods may be useful. This chapter analyzes the situation and compares the available methods and their properties.

Look out for:

• the basic template matching method for hole detection.

• the lateral histogram method for hole detection.

• how ambiguities can be eliminated with the lateral histogram method.

• how speed of processing can be estimated.

• limitations of the lateral histogram method.

• how illumination sets a limit on detection ...

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