By E. Marom, A. A. Friesem, E. Wiener-Avnear
Functions of Holography and Optical info Processing comprises the lawsuits of the foreign convention on purposes of Holography and Optical information Processing, held in Jerusalem in August 1976. The convention is attended through 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 medication, interferometry, show, garage, and retrieval, in addition to snapshot processing, measuring recommendations, spectroscopy, and recording fabrics and units. The contributors of the convention think within the promising way forward for study on Optical info Processing so long as suggestions are complemented by means of digital aid. The ebook could be of price to electronics engineers, technicians, machine scientists, and computing device 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
Comparison of Noisy Images Under the assumption of small modulations, the relationships involved in dif ferent types of imaging have been linearized. Therefore, the useful determi nistic image due to the modulation alone is the same in both coherent and in coherent cases. Now, since the power in the modulation is small, the relatée. ine/<Ι. me > . v K " σ J<ï ,> rc (5) coh coh 2 2 where σine and σcoh , are the variances of the image intensities, 6 ' and the statistical average of the image illuminance.
APPLICATION TO MEMORIES :A"BRAIN-COMPUTED" HOLOGRAM Synthetic holograms usually involve computations which are complicated and time-consuming. H. method leads to extremely simple computations, allowing to generate the Fourier hologram of a binary object, without using any Fourier transform algorithm. Figure 1 gives a monodimensionnal description of holo gram synthesis. A binary grating of period d has a ray spectrum of period 1/d. Consider another grating having a slightly different period : dm = d + m — m, p integers > 0 m « p P Where p is fixed and m represents grating number.
E. the same uniform pupil (with no filter) is used in all cases of illumination. B. Method for Noise Calculation in Partially Coherent Illumination For noise calculations , we can neglect the weak modulation m in the object Eq. (7), as stated in assumption ii). The instrumental transmittance t is then calculated according to the following steps : Noise problems 49 1) Determine the complex image amplitude A(M,S) and illuminance I(M,S) = |A|2 due to one point S of the source. 2) Write the illuminance due to the whole source of area A as : I (M) = / I(M,S) dS where S is a point on the source.