Parallel spatial intensity correlations to decode random frequency-downconverted images
We record frequency-downconverted images that are chaotic, as they are obtained in a Delta *y(2) crystal from the interaction of two pulsed pseudo-thermal fields of which the one at the higher frequency encountered the imaged object. Spatial correlations of the intensity fluctuations in these chaoti...
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| Veröffentlicht in: | Applied physics. B, Lasers and optics Lasers and optics, 2006-10, Vol.85 (1), p.125-129 |
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| container_title | Applied physics. B, Lasers and optics |
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| creator | ANDREON, A PUDDU, E BONDANI, M |
| description | We record frequency-downconverted images that are chaotic, as they are obtained in a Delta *y(2) crystal from the interaction of two pulsed pseudo-thermal fields of which the one at the higher frequency encountered the imaged object. Spatial correlations of the intensity fluctuations in these chaotic images with the intensity of a single spatial Fourier component of the low-frequency input field, allow image retrieval if the number of records on which the ensemble-averages are calculated is suitably large. When it is too small to achieve a satisfactory result, we show that computing the correlations in parallel with different components of the low-frequency input field, shifting the correlation maps according to a rule suggested by 3D phase-matching, and averaging them, leads to the recovery of the downconverted image. The method can be used for secure and fast image transmission. |
| doi_str_mv | 10.1007/s00340-006-2324-9 |
| format | Article |
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Spatial correlations of the intensity fluctuations in these chaotic images with the intensity of a single spatial Fourier component of the low-frequency input field, allow image retrieval if the number of records on which the ensemble-averages are calculated is suitably large. When it is too small to achieve a satisfactory result, we show that computing the correlations in parallel with different components of the low-frequency input field, shifting the correlation maps according to a rule suggested by 3D phase-matching, and averaging them, leads to the recovery of the downconverted image. 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The method can be used for secure and fast image transmission.</description><subject>Chaos theory</subject><subject>Correlation</subject><subject>Exact sciences and technology</subject><subject>Fourier analysis</subject><subject>Fundamental areas of phenomenology (including applications)</subject><subject>Image forming and processing</subject><subject>Imaging and optical processing</subject><subject>Lasers</subject><subject>Mathematical analysis</subject><subject>Nonlinear optics</subject><subject>Optics</subject><subject>Parametric down conversion and production of entangled photons</subject><subject>Physics</subject><subject>Three dimensional</subject><issn>0946-2171</issn><issn>1432-0649</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNpFUE1LAzEQDaJgrf4Ab7kIXqKTzX4kRyl-QUEPiseQTSaykm5qslX6701pwZnDwMybx3uPkEsONxygu80AogYG0LJKVDVTR2TGa1ExaGt1TGag6nLhHT8lZzl_QalWyhn5eDXJhICB5rWZBhPoME445mHaUhtTwlC2ccx0itShjQ5pMqOLK-oTfm9wtFvm4u9o4_iDaUJHh5X5xHxOTrwJGS8Oc07eH-7fFk9s-fL4vLhbMisaPjEpuJUAaL1ChY0DrETHoRPW7LpX3CvgbaW8r5riUza9FL0yyrmmgr4Xc3K9512nWOTkSa-GbDEEM2LcZM3bjgsJbSsKlO-hNsWcE3q9TkVs2moOehei3oeoSzR6F6JW5efqQG-yNcEX73bI_4-S16qpO_EHqxxzWA</recordid><startdate>20061001</startdate><enddate>20061001</enddate><creator>ANDREON, A</creator><creator>PUDDU, E</creator><creator>BONDANI, M</creator><general>Springer</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20061001</creationdate><title>Parallel spatial intensity correlations to decode random frequency-downconverted images</title><author>ANDREON, A ; PUDDU, E ; BONDANI, M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c351t-831c800ecf9e9e5d0e2371073cacacab91f901629ff2500785b83b9a9dd520bb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2006</creationdate><topic>Chaos theory</topic><topic>Correlation</topic><topic>Exact sciences and technology</topic><topic>Fourier analysis</topic><topic>Fundamental areas of phenomenology (including applications)</topic><topic>Image forming and processing</topic><topic>Imaging and optical processing</topic><topic>Lasers</topic><topic>Mathematical analysis</topic><topic>Nonlinear optics</topic><topic>Optics</topic><topic>Parametric down conversion and production of entangled photons</topic><topic>Physics</topic><topic>Three dimensional</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>ANDREON, A</creatorcontrib><creatorcontrib>PUDDU, E</creatorcontrib><creatorcontrib>BONDANI, M</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Applied physics. 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| subjects | Chaos theory Correlation Exact sciences and technology Fourier analysis Fundamental areas of phenomenology (including applications) Image forming and processing Imaging and optical processing Lasers Mathematical analysis Nonlinear optics Optics Parametric down conversion and production of entangled photons Physics Three dimensional |
| title | Parallel spatial intensity correlations to decode random frequency-downconverted images |
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