B.S.T.J. Briefs: Correction Concerning Reflecting Objects in Coherent Illumination

Correction Concerning Reflecting Objects in Coherent Illumination By L. H. ENLOE ( M a n u s c r i p t received J a n u a r y 31, 1969.) In a recent paper, the author analyzed and discussed the noise-like structure in images of diffuse objects in coherent illumination.* While the author's interest and discussion concerned objects viewed in reflection, a model illustrating a diffuse object was unfortunately shown in Fig. 1 as a granular transparency viewed in transmission. It turns out that the analysis presented is not sufficiently general to cover transparencies viewed in transmission. The object must be viewed in reflection because: (i) The direct beam, that is, the unscattered component, is not included in the fundamental equation (1). (ii) The relative phase angles 6 of the individual scatterers in equation (1) are not unqualifiedly random in the forward scattering direction. I would like to thank D. Berkley for bringing this to my attention. * Enloe, L. H., "Noise-Like Structure in the I m a g e of Diffusely Reflecting Objects in C o h e r e n t I l l u m i n a t i o n , " B.S.T.J., 46, N o . 7 ( S e p t e m b e r 1967), pp. 1479-1491.