F. T. S. Yu's research while affiliated with Wayne State University and other places
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Publications (14)
Citation
F. T. S. Yu, "Experiment in Linear Optimization of the Holographic Process," Appl. Opt. 11, 949_1-951 (1972)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-11-4-949_1
The basic theory of a large space bandwidth signal analysis by means of a two‐dimensional optical processor is discussed and the synthesis of a near real‐time optical sound spectrograph is presented. In the current state‐of‐the‐art, the realization of an optical sound spectrograph is feasible. It is also concluded that the optical sound spectrograp...
The holographic process has been used for many scientific applications and is expected to be extensively applied in modern optical memories, computer applications, and optical information processings, as well as coherent optical communications. In order to efficiently utilize all of these applications it is extremely important to effectively use th...
In this paper, image enhancement within and beyond the diffraction limit will be discussed. The basic differences and constraints of coherent and digital enhancement techniques will also be given. The essential difference between these two techniques is that a coherent optical system is a passive device, but a digital processing system is active. T...
In this paper an approach will be developed for wavefront recording and reconstruction with a photographic plate when emulsion thickness is not uniform. It is shown that in a first approximation an emulsion thickness variation will not affect the wavefront recording. However, thickness variation does affect the hologram image reconstruction. It is...
This paper presents a technique for distinguishing targets in a limited class, in case conventional imaging is unsuccessful due to a phase distorting medium closely overlaying the observation system. The procedure is to record the spatial density spectrum of a coherently illuminated object, construct its fourier transform, and then compare the resu...
A nonlinear hologram may be decomposed into an infinite sum of Fresnel zone lenses. Thus a sequence of high-order diffracted images will be reconstructed. The Fourier components of the Fresnel zone lenses may be determined graphically from the transmittance—exposure characteristic of the film. In this paper, the analysis of off-axis nonlinear holog...
Optimal linearization in holography is studied from the nonlinear system theory point of view. A generalized optimal linearization method for a physical photographic emulsion is presented. A generalized first-order amplitude transmittance (i.e., the generalized transfer function) with respect to the input irradiance is determined. The application o...
Citation
F. T. S. Yu, "A Note on Phase Holograms," Appl. Opt. 8, 2350-2351 (1969)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-8-11-2350
Citation
F. T. S. Yu, "Five-Point Analysis of Nonlinear Holograms," J. Opt. Soc. Am. 59, 360-362 (1969)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-59-3-360
Photographic noise is studied from the point of view of continuous-parameter Markov chains. A general, conditional-probability distribution of the undeveloped grains in a cell is used for a pure-death process. The corresponding mean and variance are obtained. A new theoretical expression relating rms density to average density is also determined. T...
The noise in magnetic tape is approached by viewing it as a stochastic process. A conditional probability distribution of the unmagnetized particles (as well as the magnetized particles), defined under the effective recording gapwidth, is derived. The corresponding mean and variance are also calculated. The general application to a typical magnetic...
A mathematical calculation of the statistical brightness gain of a postulated image intensifier is achieved. Two general cases for the signal-to-noise ratio are formulated: (1) owing to an inevitable nonadditive quantum noise, and (2) owing to the sum of a quantum noise and a postulated additive Poisson noise. The former is found to be somewhat hig...
