Fig. 3. Experimental setup for reflection mode FP and results of common objects.

(A) A simplified rendering of the experiment and (B) the experimental setup for reflection mode FP. An object is placed 1 m away from the illumination source and camera. To satisfy the Fraunhofer approximation for a short optical path, a lens is used to focus coherent light onto the aperture of the camera lens. Multiple images are acquired to create a large synthetic aperture by translating the camera and lens using a translation stage. In the bottom row, examples are shown using SAVI to improve spatial resolution in long-range imaging for everyday diffuse objects. Images captured with a small aperture are unrecognizable because of diffraction blur and speckle. Following reconstruction, fine details are visible, permitting scene identification. (C) Fingerprint deposited on glass. The fingerprint is coated in diffuse powder to provide contrast against the glass. (D) Reverse side of a U.S. $2 bill. Scale bars, 1 mm.