Earlier results on parametric model-based optical resolution by the first author [ J. Opt. Soc. Am. A 4, 1402 ( 1987)] concerned two incoherent sources of known intensity. These results are generalized to sources with any degree of coherence and unknown intensity. A further generalization is that the model underlying the observations and that chosen by the experimenter need not be the same. It is shown how, for a chosen model, observations from which the sources can be resolved can be distinguished from observations from which they cannot.
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