Optical benchmarking of security document readers for automated border control

Valentín, Kristián; Wild, Peter; Štolc, Svorad; Clabian, Markus

doi:10.1117/12.2241169

Cited by 5 publications

(5 citation statements)

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“…One possible fascinating horizon for this kind of materials is represented by their application as security inks. For example, upon excitation with a 365 nm light-emitting diodes used in commercial document scanners, 44 a multiplexed CPL-active patterning can be obtained when the two enantiomorphic phosphates of a selected emission color (green, orange, or red as a function of the Eu 3+ doping level) are deployed as separate security inks. Alternatively, mixing the two enantiomorphic crystal phases in various ratios could create a weighted CPL signal, for inspection "at a glance".…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals

Ceccon,

Cavalli,

Ruggieri

et al. 2024

Inorg. Chem.

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In this contribution, we describe the preparation, by means of a precipitation reaction from aqueous solution at 40 °C, and the structural characterization of nanocrystalline powders of trigonal Tb 1−x Eu x PO 4 •nH 2 O (with x = 0, 0.005, 0.01, 0.05, and 0.1; n tentatively assigned as 0.67) which crystallize in the two possible P3 1 21 or P3 2 21 enantiomorphic space groups. While the volume of the crystal lattice is not significantly affected by the Tb 3+ /Eu 3+ substitution, the average crystallite size seems to depend on the Eu 3+ dopant concentration and ranges from 13 to 30 nm. The desired handedness of the crystals has been induced by using, during the synthesis, one of the two possible enantiomers of tartaric acid (L or D). The analysis of the luminescence excitation and emission spectra, together with the decay kinetics of the 5 D 4 Tb 3+ excited state, suggests the presence of a very efficient Tb 3+ → Eu 3+ energy transfer process in the Eu 3+ -doped orthophosphates. Upon excitation of Tb 3+ ions at 368 nm, the enantiomorphic powders grown with L-or D-tartaric acid (i.e.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals

Ceccon,

Cavalli,

Ruggieri

et al. 2024

Inorg. Chem.

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“…Traditionally documents are digitized using various types of scanners, such as flatbed, sheet-fed, or specialized ones [15,52]. The flatbed scanners are used to capture identity document images in a lot of corporate and governmental use cases, where the time required to capture the image is less important than the cost of the required hardware.…”

Section: Fig 4 Examples Of Identity Document Images Capturedmentioning

confidence: 99%

“…For scanning identity documents in such cases as access control systems, border control applications, ticket sales kiosks or self-service kiosks for purchasing agerestricted products, a class of specialized identity document scanners is designed [52], [55 -57]. The main motivation for this class is to reduce the time required to acquire the document image, while retaining the high resolution and provide additional functionality, such as reading an RFID chip containing biometric information, capturing infrared document images, or images under ultraviolet light (see fig.…”

Section: Fig 4 Examples Of Identity Document Images Capturedmentioning

confidence: 99%

Towards a unified framework for identity documents analysis and recognition

Bulatov¹,

Bezmaternykh²,

Nikolaev

et al. 2022

Computer Optics

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Identity documents recognition is far beyond classical optical character recognition problems. Automated ID document recognition systems are tasked not only with the extraction of editable and transferable data but with performing identity validation and preventing fraud, with an increasingly high cost of error. A significant amount of research is directed to the creation of ID analysis systems with a specific focus for a subset of document types, or a particular mode of image acquisition, however, one of the challenges of the modern world is an increasing demand for identity document recognition from a wide variety of image sources, such as scans, photos, or video frames, as well as in a variety of virtually uncontrolled capturing conditions. In this paper, we describe the scope and context of identity document analysis and recognition problem and its challenges; analyze the existing works on implementing ID document recognition systems; and set a task to construct a unified framework for identity document recognition, which would be applicable for different types of image sources and capturing conditions, as well as scalable enough to support large number of identity document types. The aim of the presented framework is to serve as a basis for developing new methods and algorithms for ID document recognition, as well as for far more heavy challenges of identity document forensics, fully automated personal authentication and fraud prevention.

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“…They should be invisible to the naked eye and luminesce brightly when excited with UV-A light, for example the 365 nm light-emitting diodes (LED) used in commercial document scanners. 24 The security dyes should be readily soluble for use as inks and retain their necessary properties on deposition. They must be resistant toward fading and photobleaching and be thermally robust to survive conditions such as the relatively high temperatures (often excess of 150 °C) required for document lamination.…”

Section: [H1] Introductionmentioning

confidence: 99%

“…Suitable ligands can serve as efficient antennae to sensitize the 4f-4f transitions and protect Ln III against exogenous binders. 24,[45][46][47] This principle can be extended to incorporate Ln III into macromolecular systems such as nanoparticles, nanofibres or polymers to endow them with favourable properties. 11,[48][49][50][51] In particular, we now describe how incorporating Ln III into chiral complexes can induce CPL as a 'hidden fingerprint'an advanced security feature in the already distinct total luminescence spectra of Ln III (Fig.…”

Section: [H1] Introductionmentioning

confidence: 99%

Circularly polarized lanthanide luminescence for advanced security inks

2020

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Authenticating products and documents with security inks is vital to global commerce, security and health. Lanthanide complexes are widely used in luminescent security inks due to their unique and robust photophysical properties. Lanthanide complexes can also be engineered to undergo circularly polarised luminescence (CPL), which encodes chiral molecular fingerprints in luminescence spectra that cannot be decoded by conventional optical measurements. However, chiral CPL signals have not yet been exploited as an extra security layer in advanced security inks. This Review introduces CPL and related concepts that are necessary to appreciate the challenges and potential of lanthanide-based CPL-active security inks. We describe recent advances in CPL analysis and read-out technologies that have expedited CPL-active security ink applications. Further, we provide a systematic meta-analysis of strongly CPL-active Eu III , Tb III , Sm III , Yb III , Cm III , Dy III and Cr III complexes, discussing the suitability of their photophysical properties and highlighting promising candidates. We conclude by providing key recommendations for the development and advancement of the field.

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Optical benchmarking of security document readers for automated border control

Cited by 5 publications

References 1 publication

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals

Towards a unified framework for identity documents analysis and recognition

Circularly polarized lanthanide luminescence for advanced security inks

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Optical benchmarking of security document readers for automated border control

Cited by 5 publications

References 1 publication

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO4·nH2O Nanocrystals

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO4·nH2O Nanocrystals

Towards a unified framework for identity documents analysis and recognition

Circularly polarized lanthanide luminescence for advanced security inks

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Product

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Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals

Circularly Polarized Luminescence from Pure and Eu-Doped Trigonal TbPO₄·nH₂O Nanocrystals