The properties of the image of a nonuniform transparency degraded by speckle noise are studied. Attention is focused on the spatial details of an object that cannot be resolved by a coherent system. Analysis of the power spectrum of the noisy spatial-intensity distribution in the image plane confirms that the bandwidth for coherent diffuse illumination corresponds to the incoherent transfer function of the system. Experimental Verification is presented using a Ronchi ruling as a test object.
© 1984 Optical Society of America
G. April and H. H. Arsenault, "Nonstationary image-plane speckle statistics," J. Opt. Soc. Am. A 1, 738-741 (1984)