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{{Distinguish|Digital signal processing}}
'''Analog image processing''' is the use of an [[Optical computing|optical computer]] to process physical, [[Image|optical images]]<ref>{{Cite journal |last=Momeni |first=Ali |last2=Rouhi |first2=Kasra |last3=Fleury |first3=Romain |date=2022-01-01 |title=Switchable and simultaneous spatiotemporal analog computing with computational graphene-based multilayers |url=https://infoscience.epfl.ch/record/289300/files/1-s2.0-S0008622321009738-main.pdf |journal=Carbon |volume=186 |pages=599–611 |doi=10.1016/j.carbon.2021.10.001 |issn=0008-6223|doi-access=free }}</ref> formed by light waves coming from an object, as opposed to the [[digital image processing]]<ref>{{Cite journal |last=Burger |first=Wilhelm |last2=Burge |first2=Mark J. |date=2022 |title=Digital Image Processing |url=https://link.springer.com/book/10.1007/978-3-031-05744-1 |journal=Texts in Computer Science |language=en |doi=10.1007/978-3-031-05744-1 |issn=1868-0941}}</ref> and its use of [[Computer|digital computers]] to process pixelated, [[Digital image|digital images]]. Correspondingly, a range of digital image processing techniques possess direct physical analogs. For example, [[Fast Fourier transform|fast Fourier transform algorithms]] are commonly implemented in digital [[phase correlation]] and other digital image processing techniques. These digital [[Fourier transform|Fourier transforms]] can be considered to be the digitized approximation of methods utilizing [[Fourier optics#Fourier transforming property of lenses|Fourier transforming properties of an ideal lens]].<ref>{{Cite journal |last=Lugt |first=A.V. |date=April 1964 |title=Signal detection by complex spatial filtering |url=http://dx.doi.org/10.1109/tit.1964.1053650 |journal=IEEE Transactions on Information Theory |volume=10 |issue=2 |pages=139–145 |doi=10.1109/tit.1964.1053650 |issn=0018-9448|hdl=2027.42/8080 |hdl-access=free }}</ref>
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