By E. Marom, A. A. Friesem, E. Wiener-Avnear
Functions of Holography and Optical information Processing includes the lawsuits of the overseas convention on purposes of Holography and Optical information Processing, held in Jerusalem in August 1976. The convention is attended by way of eminent scientists within the box of optics, characterised by way of high-level clinical shows and discussions. the gathering is a illustration of analysis at the leading edge of utilized and theoretical optics. The four-day assembly covers subject matters on holographic functions in drugs, interferometry, reveal, garage, and retrieval, in addition to picture processing, measuring recommendations, spectroscopy, and recording fabrics and units. The contributors of the convention think within the promising way forward for examine on Optical information Processing so long as ideas are complemented by way of digital help. The booklet can be of price to electronics engineers, technicians, desktop scientists, and machine engineers.
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Extra info for Applications of Holography and Optical Data Processing. Proceedings of the International Conference, Jerusalem, August 23–26, 1976
And if we store the signal on a spiral in such a way that each circumference of the disc contains one complete video frame then all kinds of important possibilities appear. 3. Instead of following the spiral we jump back once per rotation we get a still picture, by jumping more or less rapidly we can go through the picture like through a book. 4. Access to each picture (and they are of the order of 50000) can be very ra pid. 5. There is no contact between the reading head and the disc. 6. The disc can be copied very rapidly and in parallel by pressing (like audio records)or by photographic means.
Figure 4 shows results for a constant speed smeared image. It is clear that image is restored. But restored image is noisy. And, in spite of careful choice of photographic emulsion, in spite of optical system optimi zation, noise still remains a very important limitation. Contribution to numerical holography Fig. 4a. Image degraded by a constant speed smear. Fig. 4b. Image restored in coherent optics by a double filter. ) This new method uses a very simple non-coherent optical system (Fig. 5 ) .
We expect considerably improved performance using this type of scheme. PHYSICAL CONSIDERATIONS By using the single rotating grating we transform a two-dimensional image into a one-dimensional array of data. For measurement and data storage this is a distinct advantage, but leads to a scarcity of information when a complicated image is being processed. In general, if we measure Ι(φ) at 2N points in 0 < φ < 2π (obtaining N complex values of Ρ(Ρ0,φ)) we can reconstruct a region containing Ν 2 /π resolution elements.