By Richard H. Vollmerhausen
Advances in good country detector arrays, flat panel screens, and electronic photo processing have triggered an expanding number of sampled imaging items and probabilities. those expertise advancements supply new possibilities and difficulties for the layout engineer and procedure analyst--this tutorial's meant reader.
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Additional resources for Analysis of sampled imaging systems
G(ξ) results from multiplying S(ξ) by R(ξ). This is true because the height of the delta function is scaled by the value of the intensity distribution at each location. Since the area under each delta function pulse is unity before the multiplication, the area of the product is the sample value. 13 can be viewed as the Fourier transform of the samples of the f(x). 12 can be derived using delta functions in the following manner. 14) n=0 where (*) denotes convolution. 15) so that N −1 g ( x) = f (nX ) δ( x − nX ) ∗ r ( x).
8 System psf results from convolving the individual psf of all of the system components. Detailed descriptions of the point spread functions and modulation transfer functions for typical imager components are given below. 1 Optical filtering There are two filters that account for the optical effects in an imaging system: diffraction and aberrations. The diffraction filter accounts for the spreading of the light as it passes an obstruction or an aperture. 13) where λ is the average band wavelength and r is the square root of x2 plus y2.
An intensity trace for one scan line is shown at the top of the figure. 17 is exaggerated. The electronics of an imaging system usually imparts only a small amount of blur on the image compared to the effects of detector shape and optical blur. The impact of electronic filtering is purposely exaggerated in order to be easily visible. The one-sided nature of electronic blur has several implications. First, the image is offset, delayed, by the electronics. In this example, the image is shifted to the right.
Analysis of sampled imaging systems by Richard H. Vollmerhausen