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The degree of spreading (blurring) of the point object is a measure for the quality of an imaging system. In [[coherence (physics)|non-coherent]] imaging systems, such as [[fluorescent]] [[microscopes]], [[telescopes]] or optical microscopes, the image formation process is linear in the image intensity and described by [[linear system]] theory. This means that when two objects A and B are imaged simultaneously, the resulting image is equal to the sum of the independently imaged objects. In other words: the imaging of A is unaffected by the imaging of B and ''vice versa'', owing to the non-interacting property of photons. In space-invariant system, i.e. the PSF is the same everywhere in the imaging space, the image of a complex object is then the [[convolution]] of the true object and the PSF.
The PSF can be derived from diffraction integrals<ref>{{Cite book|url=https://books.google.com/books?id=lCm9Q18P8cMC&newbks=0&printsec=frontcover&pg=PA355&dq=diffraction+integral+point+spread+function&q=diffraction+integral+point+spread+function&hl=de|title=Progress in Optics|date=2008-01-25|publisher=Elsevier|isbn=978-0-08-055768-7|language=en|pages=355}}</ref>
==Introduction==
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