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Spatial frequency filtering in an optical imaging system with an extended incoherent light source

: Kuhlow, B.

Applied optics 25 (1986), No.14, pp.2351-6
ISSN: 0003-6935
ISSN: 1539-4522
ISSN: 1559-128X
Journal Article
Fraunhofer HHI ()
fourier transform optics; lenses; optical images; optical information processing; pattern recognition; spatial filters; optical pattern recognition; optical imaging system; extended incoherent light source; single-lens imaging system; spatial frequency filtering; filtered diffraction pattern; fourier synthesis; convolution; object function; fourier transform; filter function; phase function; light source position

A single-lens imaging system is described that provides spatial frequency filtering to an extended incoherent light source. Two ways to calculate the modified image are considered: First, the image is derived from the filtered diffraction pattern by Fourier synthesis. Second, the convolution of the object function with a Fourier transform of the filter function has to be evaluated with regard to a phase function that corresponds to the light source position.