By Richard H. Vollmerhausen
Advancing expertise in detector arrays, flat panel screens, and electronic photo processing presents new possibilities to extend imaging purposes and improve process functionality. Technical managers and layout engineers are confronted with comparing the price, weight, and function of an ever-expanding number of expertise concepts. This instructional textual content presents the speculation, systems, and data essential to assessment and evaluate the functionality of accessible imaging applied sciences. half I updates the sooner paintings offered in research of Sampled Imaging platforms (2000). half II discusses functionality review of electro-optical imagers. half III presents laptop courses (on a supplemental CD-ROM) and up to date details on detector arrays, optics, and show concepts. The booklet covers quite a few reveal codecs and interfaces, and gives unique info on to be had focal airplane arrays (FPAs). specific emphasis is put on idea and perform for the wide range of accessible infrared FPAs. applied sciences represented comprise InSb, HgCdTe, QWIP, and uncooled thermal arrays. info is supplied at the quantum potency, blur, crosstalk, and noise features of every know-how. The detector and array dimensions of obtainable FPAs are supplied. the data on optics, demonstrate, and FPA subassemblies permits the version consumer to make fast and reasonable functionality checks of electro-optical imager designs.
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Additional info for Analysis and Evaluation of Sampled Imaging Systems (SPIE Tutorial Text Vol. TT87) (SPIE Tutorial Texts)
The period of each sinc wave is such that it goes through zero amplitude at every other sample location. The sum of all of the sinc waves generated for all sample values is the reconstructed signal. The solid dark curve in Fig. 21(b) shows the sum of the sinc waves for the two samples in Fig. 21(a). A bandlimited function is uniquely determined from its values at a sequence of equidistant points that are 1/ fsamp apart. The series in Eq. 23) is used to reconstruct the function. Each term in the series is a sample function, also referred to as a sinc function or sinc wave.
For predictable motion, the integration looks both forward and backward in time. When tracking complex motion, the integration looks only backward in time. The gray lines in Figs. 33-sec integrator. 165 sec. In Figs. 21, notice that the model behavior matches measured data rather well. 20 Plot showing gain of the oculomotor system while tracking sine waves. The data are from various sources. 21 Plot showing phase lag when tracking single sine waves. Since the motion is predictable, phase lag is either zero or slightly leads the track point.
0 per cycle. If the sample rate is just over two samples per cycle, an extended portion of the sine-wave function must be sampled and reconstructed in order to accurately replicate any one cycle. The following example illustrates this concept. 23 shows ten cycles of a sine wave. Fig. 24 is the Fourier transform of those ten cycles. Taking the first zero in Fig. 2 times per cycle. The asterisks in Fig. 23 show the sample points. 25 shows the result of sampling and reconstructing the sixth period near the middle.