“On the localization performance measure and optimal edge detection”

Tagare and deFigueiredo (see ibid., vol. 12, p. 1186-1189, 1990 ) present a localization performance measure for edge detectors. They correctly point out a flaw in Canny´s formulation of the localization criterion, which was subsequently adopted by Sarkar and Boyer (1991). They motivate their form of the localization criterion along a different line of reasoning. In this comment, the authors show that although Canny´s derivation was in error, the final form of his criterion is adequate and can, in fact, be derived from Tagare and deFigueiredo´s formulation of the problem. The authors also point out some problems with Tagare and deFigueiredo´s localization criterion