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The commenters point out explicitly that the fast search procedure of S.S. Redy et al. (see ibid., vol.SMC-14, no.4, p.661-5, (1984)) does not converge to the optimal threshold if the interclass variance, has not the unique maximum. The limitations of N. Otsu's technique (see ibid., vol.SMC-9, no.1, p.62-6, (1979)) are also discussed briefly.>
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Lee et al. (1990) studied this question.
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