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<p>Two aspects of edge detection are analyzed, namely accuracy of localization and sensitivity to noise. The detection of corners and trihedral vertices is analyzed for gradient schemes and zero-crossing schemes. It is shown that neither scheme correctly detects corners of trihedral vertices, but that the gradient schemes are less sensitive to noise. A simple but important conclusion is that the noise present in digital images of typical indoor scenes is small and the signal-to-noise ratio is high. The noise present in digital images is so small as to make the performances of a variety of filters almost indistinguishable. As a consequence small filters can be used and the exact shape of the filter is not critical.</p>
computerised picture processing; computerised pattern recognition; noise; edge detection; localization; sensitivity; trihedral vertices; gradient schemes; zero-crossing schemes; digital images; filters; computerised pattern recognition; computerised picture processing

P. Ottonello, E. De Micheli, B. Caprile and V. Torre, "Localization and Noise in Edge Detection," in IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. 11, no. , pp. 1106-1117, 1989.
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