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The 1980 work of [[Marr–Hildreth algorithm|Marr and Hildreth]] is a seminal paper in this field.<ref name=marr80>{{Cite journal |title=Theory of Edge Detection |first1=D. |last1=Marr |author1-link=David Marr (neuroscientist) |first2=E. |last2=Hildreth |author2-link=Ellen Hildreth |journal=Proceedings of the Royal Society of London. Series B, Biological Sciences |volume=207 |number=1167 |date=29 Feb 1980 |pages=187–217 |doi=10.1098/rspb.1980.0020|pmid=6102765 |bibcode=1980RSPSB.207..187M |s2cid=2150419 }}</ref>
In 2009, [[Microsoft Corporation]] developed [[PhotoDNA]] in collaboration with [[Hany Farid]], professor at [[Dartmouth College]].
PhotoDNA is a perceptual hashing capability developed to combat the distribution of [[child sexual abuse material]] (CSAM) online. Provided by Microsoft for no cost, PhotoDNA remains a critical tool used by major software companies, NGOs and law enforcement agencies around the world. <ref name="nytpdna">{{cite news |last1=Lohr |first1=Steve |title=Microsoft Tackles the Child Pornography Problem |date= December 2009 |publisher= New York Times |url=https://archive.nytimes.com/bits.blogs.nytimes.com/2009/12/16/microsoft-tackles-the-child-pornography-problem/}}</ref>
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