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==Background==
Vlasov's work<ref name="Vlasov Quantum 2003">{{cite journal|last1=Vlasov|first1=A.Y.|year=1997|title=Quantum computations and images recognition|url=https://archive.org/details/arxiv-quant-ph9703010|journal=|volume=|pages=|arxiv=quant-ph/9703010|via=|bibcode=1997quant.ph..3010V}}</ref> in 1997 focused on the use of a quantum system to recognize [[orthogonal images]]. This was followed by efforts using quantum algorithms to search specific patterns in [[Binary image|binary images]]<ref name="Schutzhold Pattern 2003">{{cite journal |title=Pattern recognition on a quantum computer |journal=Physical Review A |volume=67 |issue=6 |pages=062311 |year=2003 |last1=Schutzhold |first1=R.|arxiv=quant-ph/0208063 |doi=10.1103/PhysRevA.67.062311 }}</ref> and detect the posture of certain targets.<ref name="Beach Quantum 2003">{{cite journal |title=Quantum image processing (QuIP) |journal=Proceedings of the 32nd Applied Imagery Pattern Recognition Workshop |pages=39–40 |year=2003 |last1=Beach |first1=G.|last2=Lomont |first2=C.|last3=Cohen |first3=C.|doi=10.1109/AIPR.2003.1284246 |isbn=0-7695-2029-4 }}</ref> Notably, more optics-based interpretation for quantum imaging were initially experimentally demonstrated in <ref>{{cite journal |title=Optical imaging by means of two-photon quantum entanglement |journal=Physical Review A |volume=52 |issue=5 |pages=R3429–R3432 |year=1995 |last1=Pittman |first1=T.B.|last2=Shih |first2=Y.H.|last3=Strekalov |first3=D.V.|bibcode=1995PhRvA..52.3429P |doi=10.1103/PhysRevA.52.R3429 |pmid=9912767 }}</ref> and formalized in <ref name="Lugiato quantum 2002">{{cite journal |title=Quantum imaging |journal=Journal of Optics B |volume=4 |issue=3 |pages=S176–S183 |year=2002 |last1=Lugiato |first1=L.A.|last2=Gatti |first2=A.|last3=Brambilla |first3=E.|doi=10.1088/1464-4266/4/3/372 |bibcode=2002JOptB...4S.176L |arxiv=quant-ph/0203046 }}</ref> after seven years. Venegas-Andraca and Bose's Qubit Lattice<ref name="Venegas Storing 2003">{{cite journal |title=Storing, processing, and retrieving an image using quantum mechanics |journal=Proceedings of SPIE Conference of Quantum Information and Computation |volume=5105 |pages=134–147 |year=2003 |last1=Venegas-Andraca |first1=S.E.|last2=Bose |first2=S.|bibcode=2003SPIE.5105..137V |doi=10.1117/12.485960 |series=Quantum Information and Computation }}</ref> describes quantum images in 2003. Simultaneously, Lattorre proposed another kind of representation, called the Real Ket,<ref name="Latorre Image 2005">{{cite journal |title=Image compression and entanglement |url=https://archive.org/details/arxiv-quant-ph0510031 |arxiv=quant-ph/0510031 |year=2005 |last1=Latorre |first1=J.I.|bibcode=2005quant.ph.10031L }}</ref> whose purpose was to encode quantum images as a basis for further applications in QIMP.
Technically, these pioneering efforts with the subsequent studies related to them can be classified into three main groups:<ref name="Yan Quantum 2017"/>
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