By Richard H. Vollmerhausen
Advancing know-how in detector arrays, flat panel monitors, and electronic picture processing presents new possibilities to extend imaging purposes and increase approach functionality. Technical managers and layout engineers are confronted with comparing the fee, weight, and function of an ever-expanding collection of expertise strategies. This educational textual content presents the speculation, techniques, and data essential to assessment and evaluate the functionality of obtainable imaging applied sciences. half I updates the sooner paintings awarded in research of Sampled Imaging structures (2000). half II discusses functionality review of electro-optical imagers. half III offers desktop courses (on a supplemental CD-ROM) and up to date info on detector arrays, optics, and show strategies. The booklet covers various show codecs and interfaces, and gives specified details on on hand focal aircraft arrays (FPAs). specific emphasis is put on thought and perform for the big variety of accessible infrared FPAs. applied sciences represented contain InSb, HgCdTe, QWIP, and uncooled thermal arrays. details 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, show, and FPA subassemblies permits the version person to make quickly and practical functionality tests 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)
The larger the active detector area, the more blurred is the image. Light falling anywhere on the detector area is summed together. The detector area convolves with the scene to blur the image in the same way that the optical psf blurs the image. The MTF of the detector is the Fourier transform of the detector photosensitive area. The display MTF is the Fourier transform of a display pixelintensity pattern. In the absence of sampling artifacts, the Fourier transform of the displayed image is the Fourier transform of the scene multiplied by the product of optics, detector, display, and other component MTFs.
If f(x) is symmetrical about x = 0, then the sinusoidal terms in the Fourier transform cancel, and only a real F(ξ) results. The lens at the top of Fig. 11 forms a blur that is symmetrical both horizontally and vertically. 11 (a) The lens forms a blur that is symmetrical about both a horizontal and a vertical axis. The resulting MTF is real. (b) The blur is symmetrical about a vertical axis, but not about a horizontal axis. The resulting horizontal MTF is real, but the vertical MTF is complex. MTF is real.
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 psf is also called the impulse response of the system. Each point in the scene is blurred by the optics and projected onto the screen.