Using lensless Fourier transform holography the problem of deblurring an out-of-focus image on a photographic transparency was studied. First a lensless Fourier transform hologram of an out-of-focus image was taken using a point reference source. By replacing this hologram into the recording plane and re-illuminating it with coherent light, the imaging wave transmitted through the hologram immediately gives, by Fourier transformation, the restored, deblurred image. A bar target was photographed out-of-focus, and using this method, with subjective analysis at 95% confidence, the deblurred image was judged better than the original. This method of image deblurring does indeed work, but the restoration process is limited by the amount the transparency was out-of-focus to begin with.
Library of Congress Subject Headings
Holography; Fourier transformations
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
McCoy, Gregory, "Image deblurring using lensless Fourier transform holography" (1980). Thesis. Rochester Institute of Technology. Accessed from
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