title: Role of optics in the accuracy of depth-from-defocus systems: comment.
abstract: In their paper "Role of optics in the accuracy of depth-from-defocus systems" [J. Opt. Soc. Am. A24, 967 (2007)] the authors Blayvas, Kimmel, and Rivlin discuss the effect of optics on the depth reconstruction accuracy. To this end they applied an approach in Fourier space. An alternative derivation of their result in the spatial domain, based on geometrical optics, is presented and compared with their outcome. A better agreement with experimental data is achieved if some unclarities are refined.
authors.affiliation: University of Applied Sciences, Darmstadt, FB MN, Haardtring 100, 64295 Darmstadt, Germany. blendowske@h-da.de
authors.forename: Ralf
authors.initials: R
authors.lastname: Blendowske