Analog image processing: Difference between revisions

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{{unreferencedmore citations needed|date=August 20092022}}

{{Distinguish|Digital image processing}}

In [[electrical engineering]] and [[computer science]], '''analog image processing''' is any [[image processing]] task conducted on [[two-dimensional]] [[analog signal]]s by analog means (as opposed to [[digital image processing]]).

'''Analog image processing''' is the use of an [[Optical computing|optical computer]] to process physical, [[Image|optical images]]<ref>{{Cite journal |last1=Momeni |first1=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 |arxiv=2104.10801 |bibcode=2022Carbo.186..599M }}</ref> formed by light waves coming from an object, as opposed to the [[digital image processing]]<ref>{{Cite journal |last1=Burger |first1=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 |isbn=978-3-031-05743-4 |issn=1868-0941|url-access=subscription }}</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.<ref>{{Cite journal |last1=Preibisch |first1=Stephan |last2=Saalfeld |first2=Stephan |last3=Tomancak |first3=Pavel |date=2009-04-03 |title=Globally optimal stitching of tiled 3D microscopic image acquisitions |url=https://academic.oup.com/bioinformatics/article/25/11/1463/332497 |journal=Bioinformatics |volume=25 |issue=11 |pages=1463–1465 |doi=10.1093/bioinformatics/btp184 |issn=1367-4811 |pmc=2682522 |pmid=19346324}}</ref><ref>{{Cite journal |last1=Kyeremah |first1=Charlotte |last2=La |first2=Jeffrey |last3=Gharbi |first3=Mohamed Amine |last4=Yelleswarapu |first4=Chandra S. |date=2022-03-01 |title=Exploring different textures of a nematic liquid crystal for quantitative Fourier phase contrast microscopy |url=https://linkinghub.elsevier.com/retrieve/pii/S0030399221007192 |journal=Optics & Laser Technology |volume=147 |pages=107631 |doi=10.1016/j.optlastec.2021.107631 |bibcode=2022OptLT.14707631K |issn=0030-3992|url-access=subscription }}</ref> 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 |url-access=subscription }}</ref>

Basically any data can be represented in two types named as

1.Analog

2.Digital

if the pictorial representation of the data represented in analog wave formats that can be named as analog image.

E.g.:

television broadcasting in older days.. through the dish antenna systems..

Where as the digital representation or storing the data in digital form is termed as a digital image processing

E.g.:image data stored in digital logic gates..

== References ==

[[Category:Image processing]]

{{Reflist}}

[[Category:Image processing| ]]