By Richard H. Vollmerhausen
Advancing know-how in detector arrays, flat panel monitors, and electronic picture processing offers new possibilities to extend imaging purposes and improve method functionality. Technical managers and layout engineers are confronted with comparing the price, weight, and function of an ever-expanding collection of expertise suggestions. This educational textual content presents the idea, methods, and data essential to review and examine the functionality of obtainable imaging applied sciences. half I updates the sooner paintings offered in Analysis of Sampled Imaging platforms (2000). half II discusses functionality evaluate of electro-optical imagers. half III presents desktop courses (on a supplemental CD-ROM) and up to date info on detector arrays, optics, and show recommendations.
The booklet covers a number of demonstrate codecs and interfaces, and gives special info on to be had focal aircraft arrays (FPAs). specific emphasis is put on thought and perform for the big variety of obtainable infrared FPAs. applied sciences represented comprise InSb, HgCdTe, QWIP, and uncooled thermal arrays. info is equipped at the quantum potency, blur, crosstalk, and noise features of every expertise. The detector and array dimensions of accessible FPAs are supplied. the knowledge 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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Extra resources for Analysis and evaluation of sampled imaging systems
The sampling theorem does not suggest that a sampled signal is reconstructed accurately to half the sample rate. That assumption ignores aliasing. The sampling theorem assumes that the presample image is ideally bandlimited and that an ideal filter is used for image reconstruction at the display. However, for practical reasons, ideal filters are not implemented. The sampling theorem does not provide a basis for evaluating real systems; it represents an ideal goal. Bibliography Bracewell, R. , The Fourier Transform and Its Applications, McGraw-Hill, New York (1986).
75 μm. 0 μm. 5 μm the near infrared. Light with wavelengths between 1 and 2 μm is called short-wave infrared (SWIR). Evaluation of reflected-light imagers differs from evaluation of thermal imagers in two important respects. First, the target signature is highly variable. Both the intensity and spectral nature of natural illumination depend on time of day and weather. Also, there is a wide variation in material spectral reflectivities. An object that is highly visible when viewed against one background surface might almost disappear when viewed against a different surface material.
The asterisks in Fig. 23 show the sample points. 25 shows the result of sampling and reconstructing the sixth period near the middle. 26 shows the result of generating sinc waves for all 22 samples and adding them together. The sixth cycle is reconstructed mainly by contributions from neighboring cycles of the sine wave. 22 The Fourier transform of a single cycle of a sine wave with period of one. The transform is a single frequency only if the sine wave is infinitely extended. 23 Ten cycles of a sine wave.
Analysis and evaluation of sampled imaging systems by Richard H. Vollmerhausen
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