30 October 1997 Influence of diaphragm of camera on deblurring problem
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We studied the influence of an aperture shape of a diaphragm on the restoration of low quality out-of-focus video images. We measured PSF of three consumer video cameras which are equipped with different types of the diaphragm system. In this measurements, the appropriateness of the assumption of space-invariant PSF and the aperture-size-dependence of the geometrical shape of PSF were examined. Although rotationally symmetric PSF has been assumed in many studies, it was recognized that the shape of PSF is not circular but triangular or rhomboid in many cases. Moreover, the shape depends both on the camera type and the aperture opening ratio. We applied the measured PSF to the restoration of the blurred images taken by the home video cameras. The Wiener filtering technique was used to restore the images. More desirable images were obtained by approximating PSF to two triangular disks on the basis of the measurement than by approximating PSF to a circular disk or a gaussian function.
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Kenji Kurosawa, Kenro Kuroki, Naoki Saitoh, "Influence of diaphragm of camera on deblurring problem", Proc. SPIE 3164, Applications of Digital Image Processing XX, (30 October 1997); doi: 10.1117/12.292776; https://doi.org/10.1117/12.292776

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