By Richard H. Vollmerhausen
Advancing know-how in detector arrays, flat panel screens, and electronic photograph processing offers new possibilities to extend imaging functions and increase procedure functionality. Technical managers and layout engineers are confronted with comparing the associated fee, weight, and function of an ever-expanding choice of know-how ideas. This instructional textual content offers the idea, strategies, and data essential to overview and examine the functionality of accessible imaging applied sciences. half I updates the sooner paintings offered in Analysis of Sampled Imaging platforms (2000). half II discusses functionality assessment of electro-optical imagers. half III presents machine courses (on a supplemental CD-ROM) and up to date details on detector arrays, optics, and show strategies.
The ebook covers a number of reveal codecs and interfaces, and gives designated details on to be had focal airplane arrays (FPAs). specific emphasis is put on idea and perform for the wide range of obtainable infrared FPAs. applied sciences represented contain 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 obtainable FPAs are supplied. the data on optics, exhibit, and FPA subassemblies permits the version person to make quickly and lifelike functionality tests of electro-optical imager designs
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23 Ten cycles of a sine wave. 2 times per cycle at the asterisks. 24 Fourier transform of the ten sine-wave periods shown in Fig. 23. 25 The sixth cycle is not properly reconstructed using only the samples from that period. 26 Reconstruction of Fig. 23 using all 22 samples. Note that the sixth cycle is now properly reconstructed. However, the end cycles are still low in amplitude. The sixth cycle is poorly sampled due to the sample phase. It reproduces well in the final result because it is surrounded by other sampled periods of the sine wave.
10 Sunlight scattered from atmosphere degrades target-to-background contrast. 11 Effect of SGR on contrast transmission. 9 per km. 4-per-km transmission. 3 Typical SGR ratios.
13). E snap t eye TCCD E noise . 18) In fact, noise amplitude actually decreases for shorter integration times. However, the signal decreases faster than the noise amplitude. Holding the display luminance constant means that electronic gain increases to overcome the reduced signal. The increased gain makes display noise larger in the snapshot mode. 7 Illustration of pseudo-interlace. FPA rows are summed so that sensitivity is maintained. The technique does lead to added vertical blur. org/terms 202 Chapter 10 If frame integration is used, then the effect depends on whether the imager is in framing or snapshot mode.