Showing papers by "Jumpei Tsujiuchi published in 1971"

Optical Image Deblurring Methods

Abstract: Greatly sharpened images may be extracted from photographs which have been blurred either by accident (motion, lack of focus, atmospheric turbulence, etc.) or deliberately, for instance when ‘coded’ in view of special image processing or synthesis applications. Four image-deblurring methods may be distinguished: 1. Coherent optical analogue processing, 2. Incoherent optical analogure processing (non-electronic) 3. Incoherent opto-electronic analogue processing and 4. Digital computer processing. Of these, the methods 1 and 3 are reviewed in some detail, and some previously unpublished experimental results are given for illustration. Particular emphasis is also given to the distinction between image-deblurring methods operating directly in the spatial (image) domain, very powerful but developed so far only in special cases (e.g. defocused and motion-blurred images), on the one hand, and, on the other the spatial-frequency filtering image-deblurring methods, also quite general, but still in an early state of perfection. Both methods may require considerable further work before widespread implementation

Correlation Techniques by Holography and its Application to Fingerprint Identification

Abstract: The optical correlation technique is a powerful means for optical pattern recognition [1][2], and holography brings a new and precise method known as optical matched filtering [3] using a Fourier-transform hologram.