By Richard H. Vollmerhausen
Advancing know-how in detector arrays, flat panel monitors, and electronic photo processing presents new possibilities to extend imaging purposes and increase approach functionality. Technical managers and layout engineers are confronted with comparing the price, weight, and function of an ever-expanding choice of expertise recommendations. This instructional textual content presents the speculation, techniques, and data essential to evaluation 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 assessment of electro-optical imagers. half III presents machine courses (on a supplemental CD-ROM) and updated details on detector arrays, optics, and exhibit strategies. The ebook covers numerous show codecs and interfaces, and gives designated info on to be had focal airplane arrays (FPAs). specific emphasis is put on conception and perform for the big variety 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 know-how. The detector and array dimensions of accessible FPAs are supplied. the knowledge on optics, show, and FPA subassemblies permits the version consumer to make fast and practical functionality checks of electro-optical imager designs.
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Extra resources for Analysis and Evaluation of Sampled Imaging Systems (SPIE Tutorial Text Vol. TT87) (SPIE Tutorial Texts)
22) quantitatively describes the relationship between the various stages of the sampling process. This equation allows us to explore design tradeoffs in a sampled imager. 18(a) Sampling replicates the spectrum F() at every integer multiple of the sample frequency. In this case, the sample rate is five per unit distance. The MTF of the display R() then multiplies the replicated spectra. The result is the image spectrum G() shown in the next figure. 18(b) The Fourier transform of the displayed image G() obtained by multiplying replicas of F() at each multiple of the sample frequency by the display MTF R().
1, a simple optical system is imaging a clock onto a screen. For simplicity, unity magnification is assumed. If each point in the scene is blurred by the same amount, then the system is shift invariant. If the image intensity profile equals the sum of the individual blurs from each point in the scene, then the system is linear. The optical blur is called the point spread function (psf). The psf is illustrated in the lower left corner of the image. Each point source in the scene becomes a psf in the image.
The stabilization error signal might be available from inertial sensors on the gimbal, or the error signal might be derived from image processing. E-stab uses the error signal to calculate how much the image should move on the display in order to cancel LOS jitter. Display interpolation provides subpixel registration of the image from frame to frame. 31) do not apply to E-stab because the entire jitter period is not sampled. One blur associated with E-stab is due to target jitter during detector integration.