By Richard H. Vollmerhausen
Advances in reliable country detector arrays, flat panel screens, and electronic snapshot processing have caused an expanding number of sampled imaging items and chances. those know-how advancements supply new possibilities and difficulties for the layout engineer and process analyst--this tutorial's meant reader.
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Additional resources for Analysis of sampled imaging systems
The circuit drives a display monitor. 15 Diagram of scanning sensor showing electronic circuit between the detector and display. The diffraction of the lens, the detector shape, the sample-and-hold, the monitor display spot, and the eye all blur the original target. The circuit also blurs the target. Like the other imager components, the circuit has an impulse response and a transfer function. However, the impulse response of the circuit is different from the impulse response of the optics or detector or display.
14. The new expression for G(ξ) does not involve the sample values. In all of the above sampling examples, the x = 0 origin is the first sample point. The function f(x) is defined as the intensity distribution starting at the origin. The function f(x) is simply whatever spatial distribution is being sampled. The above expressions for g(x) and G(ξ) do not lack generality because, in those expressions, f(x) is only known by its sample values. If the imaged scene shifts, then f(x) is re-defined, and new sample values are obtained at f(nX), n = 0, 1, 2,...
This term represents the desired frequency content in the image. Sampled imager response function 51 This desirable frequency content is often refered to as the baseband spectrum or simply baseband. 6 The pre-sample image spectrum F(ξ) is replicated at all integer multiples of the sample frequency. The displayed image spectrum is the product of the display MTF Pix(ξ) and all of the replicated spectra including the original F(ξ) at the spatial frequency origin. The Fourier transform of the sampling artifacts is that part of the image spectrum that is found by multiplying the display MTF by all of the replicated spectra except the one located at the origin.