Defocused pictures are restored by the convolution operation with a special scanning aperture. The scanning aperture has a circular shape with an extent smaller than twice that of the defocused point-spread function, and is divided into ten concentric rings with equal separation. The restoration experiment is executed using a digital computer image-processing system, and some experimental results evaluating the effectiveness of the aperture are described.
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Honda et al. (1977) studied this question.
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