WO2007006242A1 - Méthode de vérification de l’authenticité d’objets - Google Patents

Méthode de vérification de l’authenticité d’objets Download PDF

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Publication number
WO2007006242A1
WO2007006242A1 PCT/CZ2006/000042 CZ2006000042W WO2007006242A1 WO 2007006242 A1 WO2007006242 A1 WO 2007006242A1 CZ 2006000042 W CZ2006000042 W CZ 2006000042W WO 2007006242 A1 WO2007006242 A1 WO 2007006242A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
infrared radiation
visible
fact
image
Prior art date
Application number
PCT/CZ2006/000042
Other languages
English (en)
Inventor
Jaromir Pech
Original Assignee
Jaromir Pech
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CZ20050437A external-priority patent/CZ296714B6/cs
Priority claimed from CZ20050460A external-priority patent/CZ2005460A3/cs
Application filed by Jaromir Pech filed Critical Jaromir Pech
Publication of WO2007006242A1 publication Critical patent/WO2007006242A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/7243—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality with interactive means for internal management of messages
    • H04M1/72439—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality with interactive means for internal management of messages for image or video messaging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/52—Details of telephonic subscriber devices including functional features of a camera

Definitions

  • the invention pertains to the method of verifying the authenticity of objects, mainly notes and cheques, using a mobile phone equipped for multi-media messages.
  • Semi-conductor image scanning devices employed in mobile phones are, because of their physical nature, able to scan the visible and near infrared area of electromagnetic radiation, and transfer it into an electric signal that can subsequently be interpreted as a visible image by means of the display.
  • the near infrared component of the electromagnetic radiation ultimately creates a visible image on the display, an image similar to that created by the visible component of infrared r,adiation.
  • the near infrared component of electromagnetic radiation is suppressed by an optic filter, so that the image visible on the display would not be distorted by the image created by the near infrared component .
  • the appropriately equipped mobile phones have the possibility of connection to the Internet and approach to a wide range of information that can be used for verification of authenticity of anything, but such information is not organised in such a way so as it can serve for prompt use with clear results.
  • the purpose of the invention is to find a simple way of verifying the authenticity of objects, in particular bank notes and cheques.
  • the objective of the invention is the verification of the authenticity of objects, in particular bank notes and cheques, using a mobile phone fitted with a device for the reception of multimedia messages.
  • the drawbacks of the current methods for the verification of the authenticity of objects using a mobile phone i.e. a time-consuming process with inconclusive results, are rectified by this method for the verification of the authenticity of objects, in particular bank notes and cheques, using a mobile phone fitted with a device for the reception of multimedia messages based on this invention.
  • the substance of the invention is that the scanned image of the object being verified, made in the electromagnetic radiation field outside the visible field using a mobile phone, is compared to the scanned image of a standard rendering of the object in question, made in the same electromagnetic radiation field and kept on file by the operator.
  • the advantage is that the operator may keep several images on file for each standard rendering of the object, e.g. on different wavelengths of electromagnetic radiation or multiple images of the details of the standard rendering of the object.
  • the method is simple to implement using a mobile phone fitted with a filter that lets through infrared radiation.
  • the mobile phone acquires a completely new utility feature, employing its semi-conductor image scanning device in conjunction with a control element enabling the user to, in particular, place a filter in front of the semi-conductor image scanning device, which lets the near infrared radiation through and blocks the visible radiation, i.e. a filter with an edge with spectral characteristics of transmittance in the range from 700 nm to 1 200 nm, thus creating an image on the display of the mobile phone with semi-conductor image scanning device corresponding to the near infrared component of the electromagnetic radiation emitted from the object under observation towards the mobile telephone fitted with the semi-conductor image scanning device.
  • control device taking advantage of the use of a mobile telephone fitted with the typical semiconductor image scanning device currently used in common designs of mobile telephones, the control device would not only place a filter in front of the semi-conductor image scanning device letting the near infrared radiation through and blocking the visible radiation, but would also remove the optic filter suppressing the near infrared component of electromagnetic radiation.
  • control element to simultaneously connect an auxiliary source of near infrared radiation (preferably performed through at least one semiconductor diode, emitting such radiation) irradiating the object under observation.
  • the auxiliary source of near infrared radiation may be advantageously performed through several semi-conductor diodes with various wavelengths of emitted radiation that may be gradually connected manually or through a programmable sequence. Then the display shows the changes in the object image in case of irradiation with near infrared radiation of changing wavelengths.
  • a mobile telephone with semiconductor image scanning device equipped with a control element for controlling the filter which lets the infrared radiation through and is placed in front of the semiconductor image scanning device.
  • the control element is set up for simultaneous switch on of the auxiliary source of near infrared radiation.
  • the mobile telephone is equipped with a semi-conductor switching element for limiting the dose of near infrared radiation from the auxiliary source of the near infrared radiation for the value that is necessary form the energetic and time point of view for obtaining the infrared image, mainly connected with the function of saving the scanned image in the telephone memory.
  • the auxiliary source of near infrared radiation is advantageously performed by at least one semi-conductor diode emitting infrared radiation that can be easily adjusted in a mobile telephone.
  • control element it is advantageous for the control element to be set up for simultaneous switch off of the filter that restrains in a mobile telephone with semi-conductor image scanning device the near infrared element of electromagnetic radiation during work in visible field of radiation.
  • the auxiliary source of near infrared radiation advantageously contains at least one another semi-conductor diode, emitting the infrared radiation with different wavelength.
  • the control element is advantageously performed in virtual form by a sequence of set ups of controllers designed for controlling other functions o the mobile telephone.
  • Another semi-conductor image scanning element is advantageously integrated to the substrate of semi-conductor image scanning element .
  • the mobile telephone may be equipped with another image scanning element sensitive to infrared radiation that may be advantageously integrated to the substrate of semi-conductor image scanning element.
  • the mobile telephone with semi-conductor image scanning element is equipped with a control element use by the service staff to induce on the display of the mobile telephone with semi-conductor image scanning devices such an image that corresponds with the close infrared element of electromagnetic radiation, directed from the object under observation to the mobile telephone with semi-conductor image scanning device.
  • the control element puts in front of the semi-conductor scanning device a filter that suppresses visible electromagnetic radiation.
  • control element excludes the filter that suppresses the near infrared element of electromagnetic radiation in visible field of radiation in the mobile telephone with semi-conductor image scanning element.
  • the control element simultaneously switches on the auxiliary source of near infrared radiation, advantageously performed with at least one semi-conductor diode, emitting infrared radiation.
  • the auxiliary source of infrared radiation contains at least one another semi-conductor diode, emitting infrared radiation with different wavelength.
  • control elements transfers to the input of the display of the mobile telephone with semi-conductor image scanning element another semi-conductor image scanning element, sensitised to required field of near infrared electromagnetic radiation that is advantageously integrated to the substrate of the semi-conductor image scanning device.
  • the control element is advantageously performed in virtual form by a sequence of set ups of controllers, used for controlling other functions of the mobile phone.
  • filter placed in front of the semi-conductor image scanning device that may advantageously replace (for the time of infrared image scanning) the filter that is currently used in mobile telephones, so as it suppresses infrared radiation in case of standard images,
  • infrared semi-conductor diode that provides supplementary lighting for the infrared light-controlled object, for example a bank note.
  • the above specified features may be connected with the function of scanned image saving in the telephone memory in such a way, that they are used only for the time needed for the scanned image saving in the telephone memory.
  • connection means that - even in case of using very cheap and weak infra diode - it is possible to reach high quality infra red image based on pulse operation.
  • the operator For operation between the operator and the mobile telephone user it is necessary to have a mobile telephone equipped with a filter that passes through the infrared radiation - it is lay out in the mobile telephone objective in this sample version.
  • the user makes an image of the verified object in the field of near infrared radiation.
  • the operator send a MMS message to the user, containing an image of standard version of the given object in the field of near infrared radiation.
  • the user compares both of the images in his mobile telephone and if the images are identical it is clear that it is the authentic object with high probability.
  • the filter letting through the infrared radiation of the mobile telephone with semi-conductor image scanning element may be in the form of a shut made of material letting pass through the near infrared component of the electromagnetic radiation but it does not let through the visible component of electromagnetic radiation.
  • the shut prevents passage of visible radiation to the mobile telephone with semi-conductor image scanning element.
  • the mobile telephone with semi-conductor image scanning element shows the image induced only by the residual component of near infrared radiation, i.e. the component let through by the filter, used in the mobile telephone for suppression of undesirable influence of near infrared component when displaying objects in visible component of electromagnetic radiation.
  • the filter letting through the infrared radiation can be performed for example in the form of a slide valve placed on the way of radiation to the semi-conductor scanning element, where the slide valve is replaced with a filter suppressing the near infrared component of electromagnetic radiation and letting through the visible component of the electromagnetic radiation for a filter, suppressing the visible component of electromagnetic radiation and letting through the near infrared component of electromagnetic radiation.
  • the filter letting through the infrared radiation fulfils the same function as in case of previous sample versions plus there is switched on the auxiliary source of near infrared radiation, advantageously performed with at least one semi-conductor diode emitting the infrared radiation.
  • the auxiliary source of near infrared radiation in this sample version may consist of several semiconductor diodes with various wavelengths of emitted radiation. On the basis of manual or program-controlled switching of the diodes it is possible to gradually obtain an image in two or more wavelengths of near infrared radiation on the telephone display.
  • the last sample version includes a mobile telephone with semi-conductor image scanning element equipped with another semi-conductor image scanning element, sensitised to selected near infrared field of electromagnetic radiation that is advantageously integrated to the substrate of semi-conductor image scanning element and the control element then switches the input of the mobile telephone display to one of the outputs of the two semi-conductor image scanning elements
  • the invention can be used for fast and reliable verification of all the objects with their scan made out of the field of visible electromagnetic radiation to differ from a scan made in the visible field of electromagnetic radiation.
  • the mobile telephone with semi-conductor image scanning element according to this invention can be used mainly for fast and reliable verification of authenticity of protected products, mainly valuables, papers and documents. It is important mainly thanks to the possibility of mass use in fight against money forgers, as it allows each and every owner of such mobile phone to immediately identify any bank note forgery.

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

Méthode de vérification de l’authenticité d’objets, principalement de notes et de chèques, employant un téléphone mobile équipé pour la réception de messages multimédia, où l’image de l’objet de la plage des radiations électromagnétiques hors du visible est comparée, en utilisant le téléphone mobile, à une image de version standard, du même objet, de la même plage de radiations électromagnétiques, enregistrée chez l’opérateur. Dispositif de vérification de l’authenticité d’objets, principalement de notes et de chèques, employant un téléphone mobile équipé d’un filtre laissant passer les radiations infrarouges et supprimant les radiations visibles.
PCT/CZ2006/000042 2005-07-07 2006-06-21 Méthode de vérification de l’authenticité d’objets WO2007006242A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CZPV2005-437 2005-07-07
CZ20050437A CZ296714B6 (cs) 2005-07-07 2005-07-07 Mobilní telefon
CZPV2005-460 2005-07-15
CZ20050460A CZ2005460A3 (cs) 2005-07-15 2005-07-15 Zpusob overování pravosti objektu

Publications (1)

Publication Number Publication Date
WO2007006242A1 true WO2007006242A1 (fr) 2007-01-18

Family

ID=37027018

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CZ2006/000042 WO2007006242A1 (fr) 2005-07-07 2006-06-21 Méthode de vérification de l’authenticité d’objets

Country Status (1)

Country Link
WO (1) WO2007006242A1 (fr)

Cited By (46)

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Publication number Priority date Publication date Assignee Title
WO2009096818A2 (fr) * 2008-02-02 2009-08-06 Mikhail Arkadevich Mikhailov Terminal mobile à fonction de détecteur de billets de banque
CN103270539A (zh) * 2010-12-22 2013-08-28 尤尼卡技术股份有限公司 用于认证用光致变色系统标记的文件的方法和装置
US9058653B1 (en) 2011-06-10 2015-06-16 Flir Systems, Inc. Alignment of visible light sources based on thermal images
US9143703B2 (en) 2011-06-10 2015-09-22 Flir Systems, Inc. Infrared camera calibration techniques
US9208542B2 (en) 2009-03-02 2015-12-08 Flir Systems, Inc. Pixel-wise noise reduction in thermal images
US9207708B2 (en) 2010-04-23 2015-12-08 Flir Systems, Inc. Abnormal clock rate detection in imaging sensor arrays
US9235876B2 (en) 2009-03-02 2016-01-12 Flir Systems, Inc. Row and column noise reduction in thermal images
US9235023B2 (en) 2011-06-10 2016-01-12 Flir Systems, Inc. Variable lens sleeve spacer
US9292909B2 (en) 2009-06-03 2016-03-22 Flir Systems, Inc. Selective image correction for infrared imaging devices
USD765081S1 (en) 2012-05-25 2016-08-30 Flir Systems, Inc. Mobile communications device attachment with camera
US9451183B2 (en) 2009-03-02 2016-09-20 Flir Systems, Inc. Time spaced infrared image enhancement
US9473681B2 (en) 2011-06-10 2016-10-18 Flir Systems, Inc. Infrared camera system housing with metalized surface
US9509924B2 (en) 2011-06-10 2016-11-29 Flir Systems, Inc. Wearable apparatus with integrated infrared imaging module
US9521289B2 (en) 2011-06-10 2016-12-13 Flir Systems, Inc. Line based image processing and flexible memory system
US9517679B2 (en) 2009-03-02 2016-12-13 Flir Systems, Inc. Systems and methods for monitoring vehicle occupants
US9635220B2 (en) 2012-07-16 2017-04-25 Flir Systems, Inc. Methods and systems for suppressing noise in images
US9635285B2 (en) 2009-03-02 2017-04-25 Flir Systems, Inc. Infrared imaging enhancement with fusion
US9674458B2 (en) 2009-06-03 2017-06-06 Flir Systems, Inc. Smart surveillance camera systems and methods
US9706137B2 (en) 2011-06-10 2017-07-11 Flir Systems, Inc. Electrical cabinet infrared monitor
US9706138B2 (en) 2010-04-23 2017-07-11 Flir Systems, Inc. Hybrid infrared sensor array having heterogeneous infrared sensors
US9706139B2 (en) 2011-06-10 2017-07-11 Flir Systems, Inc. Low power and small form factor infrared imaging
US9716843B2 (en) 2009-06-03 2017-07-25 Flir Systems, Inc. Measurement device for electrical installations and related methods
US9723227B2 (en) 2011-06-10 2017-08-01 Flir Systems, Inc. Non-uniformity correction techniques for infrared imaging devices
US9756262B2 (en) 2009-06-03 2017-09-05 Flir Systems, Inc. Systems and methods for monitoring power systems
US9756264B2 (en) 2009-03-02 2017-09-05 Flir Systems, Inc. Anomalous pixel detection
US9807319B2 (en) 2009-06-03 2017-10-31 Flir Systems, Inc. Wearable imaging devices, systems, and methods
US9811884B2 (en) 2012-07-16 2017-11-07 Flir Systems, Inc. Methods and systems for suppressing atmospheric turbulence in images
US9819880B2 (en) 2009-06-03 2017-11-14 Flir Systems, Inc. Systems and methods of suppressing sky regions in images
US9843742B2 (en) 2009-03-02 2017-12-12 Flir Systems, Inc. Thermal image frame capture using de-aligned sensor array
US9848134B2 (en) 2010-04-23 2017-12-19 Flir Systems, Inc. Infrared imager with integrated metal layers
US9900526B2 (en) 2011-06-10 2018-02-20 Flir Systems, Inc. Techniques to compensate for calibration drifts in infrared imaging devices
US9918023B2 (en) 2010-04-23 2018-03-13 Flir Systems, Inc. Segmented focal plane array architecture
US9948872B2 (en) 2009-03-02 2018-04-17 Flir Systems, Inc. Monitor and control systems and methods for occupant safety and energy efficiency of structures
US9961277B2 (en) 2011-06-10 2018-05-01 Flir Systems, Inc. Infrared focal plane array heat spreaders
US9973692B2 (en) 2013-10-03 2018-05-15 Flir Systems, Inc. Situational awareness by compressed display of panoramic views
US9986175B2 (en) 2009-03-02 2018-05-29 Flir Systems, Inc. Device attachment with infrared imaging sensor
US9998697B2 (en) 2009-03-02 2018-06-12 Flir Systems, Inc. Systems and methods for monitoring vehicle occupants
US10051210B2 (en) 2011-06-10 2018-08-14 Flir Systems, Inc. Infrared detector array with selectable pixel binning systems and methods
US10079982B2 (en) 2011-06-10 2018-09-18 Flir Systems, Inc. Determination of an absolute radiometric value using blocked infrared sensors
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US10757308B2 (en) 2009-03-02 2020-08-25 Flir Systems, Inc. Techniques for device attachment with dual band imaging sensor
US10841508B2 (en) 2011-06-10 2020-11-17 Flir Systems, Inc. Electrical cabinet infrared monitor systems and methods
US11297264B2 (en) 2014-01-05 2022-04-05 Teledyne Fur, Llc Device attachment with dual band imaging sensor

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Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009096818A2 (fr) * 2008-02-02 2009-08-06 Mikhail Arkadevich Mikhailov Terminal mobile à fonction de détecteur de billets de banque
WO2009096818A3 (fr) * 2008-04-02 2009-12-03 Mikhailov Mikhail Arkadevich Terminal mobile à fonction de détecteur de billets de banque
US9843742B2 (en) 2009-03-02 2017-12-12 Flir Systems, Inc. Thermal image frame capture using de-aligned sensor array
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US9986175B2 (en) 2009-03-02 2018-05-29 Flir Systems, Inc. Device attachment with infrared imaging sensor
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US9208542B2 (en) 2009-03-02 2015-12-08 Flir Systems, Inc. Pixel-wise noise reduction in thermal images
US9517679B2 (en) 2009-03-02 2016-12-13 Flir Systems, Inc. Systems and methods for monitoring vehicle occupants
US10757308B2 (en) 2009-03-02 2020-08-25 Flir Systems, Inc. Techniques for device attachment with dual band imaging sensor
US10244190B2 (en) 2009-03-02 2019-03-26 Flir Systems, Inc. Compact multi-spectrum imaging with fusion
US9235876B2 (en) 2009-03-02 2016-01-12 Flir Systems, Inc. Row and column noise reduction in thermal images
US10033944B2 (en) 2009-03-02 2018-07-24 Flir Systems, Inc. Time spaced infrared image enhancement
US9451183B2 (en) 2009-03-02 2016-09-20 Flir Systems, Inc. Time spaced infrared image enhancement
US9998697B2 (en) 2009-03-02 2018-06-12 Flir Systems, Inc. Systems and methods for monitoring vehicle occupants
US9635285B2 (en) 2009-03-02 2017-04-25 Flir Systems, Inc. Infrared imaging enhancement with fusion
US9819880B2 (en) 2009-06-03 2017-11-14 Flir Systems, Inc. Systems and methods of suppressing sky regions in images
US9843743B2 (en) 2009-06-03 2017-12-12 Flir Systems, Inc. Infant monitoring systems and methods using thermal imaging
US9807319B2 (en) 2009-06-03 2017-10-31 Flir Systems, Inc. Wearable imaging devices, systems, and methods
US10091439B2 (en) 2009-06-03 2018-10-02 Flir Systems, Inc. Imager with array of multiple infrared imaging modules
US9292909B2 (en) 2009-06-03 2016-03-22 Flir Systems, Inc. Selective image correction for infrared imaging devices
US9756262B2 (en) 2009-06-03 2017-09-05 Flir Systems, Inc. Systems and methods for monitoring power systems
US9716843B2 (en) 2009-06-03 2017-07-25 Flir Systems, Inc. Measurement device for electrical installations and related methods
US9674458B2 (en) 2009-06-03 2017-06-06 Flir Systems, Inc. Smart surveillance camera systems and methods
US9848134B2 (en) 2010-04-23 2017-12-19 Flir Systems, Inc. Infrared imager with integrated metal layers
US9706138B2 (en) 2010-04-23 2017-07-11 Flir Systems, Inc. Hybrid infrared sensor array having heterogeneous infrared sensors
US9918023B2 (en) 2010-04-23 2018-03-13 Flir Systems, Inc. Segmented focal plane array architecture
US9207708B2 (en) 2010-04-23 2015-12-08 Flir Systems, Inc. Abnormal clock rate detection in imaging sensor arrays
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CN103270539A (zh) * 2010-12-22 2013-08-28 尤尼卡技术股份有限公司 用于认证用光致变色系统标记的文件的方法和装置
US9723227B2 (en) 2011-06-10 2017-08-01 Flir Systems, Inc. Non-uniformity correction techniques for infrared imaging devices
US9473681B2 (en) 2011-06-10 2016-10-18 Flir Systems, Inc. Infrared camera system housing with metalized surface
US10841508B2 (en) 2011-06-10 2020-11-17 Flir Systems, Inc. Electrical cabinet infrared monitor systems and methods
US9716844B2 (en) 2011-06-10 2017-07-25 Flir Systems, Inc. Low power and small form factor infrared imaging
US9706139B2 (en) 2011-06-10 2017-07-11 Flir Systems, Inc. Low power and small form factor infrared imaging
US9706137B2 (en) 2011-06-10 2017-07-11 Flir Systems, Inc. Electrical cabinet infrared monitor
US9058653B1 (en) 2011-06-10 2015-06-16 Flir Systems, Inc. Alignment of visible light sources based on thermal images
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