Thermography and biomedical application in machine learning

Thermography and biomedical application

1. Thermography &
Biomedical Application
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Ramya Devi R

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3. THERMOGRAPHY
ThermalimagesorThermograms,arevisualdisplaysofthe
amountofinfraredenergyemitted,transmitted,andreflected
byanobject.
Theterm"Thermography"referstocapturingofthermal
patternsanddataemittedbyanobjectwiththeuseofan
infraredimagingandmeasurementcamera.
ThermographiccamerasdetectradiationinIRrangeofthe
electromagneticspectrumandproduceimagesofthat
radiationcalled“hotspots”.
Infraredthermographyisthescienceofacquisitionand
analysisofthermalinformationbyusingnoncontactthermal
imagingdevices.
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4. WHAT IS INFRARED?
4 Infraredlightisnotvisibletothe
nakedeyebecauseinfrared
wavelengthsaretoohighonthe
electromagneticspectrum.
Thewavelengthsarelongerthan
thoseofvisiblelightandshorter
thanthoseofradiowaves.This
partoftheelectromagnetic
spectrumiscontributestoheator
“heatradiation”.
TheamountofIRradiation
emittedbyanobjectincreases
withtemperature,therefore
thermographyallowsonetosee
variationsintemperature.

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THERMOGRAPHIC CAMERA
ThermographiccamerasdetectradiationinIR
rangeoftheelectromagneticspectrumand
produceimagesofthatradiationcalled“hot
spots”.
Thecameraconvertsradiatedheatenergyinto
anelectricalsignalwhichisthendisplayedon
themonitorasareal-timeheatimageofthe
objectbeingscanned.
Thecameraassignsblackcolourforthe
coolestareaandwhitecolourforthehottest
area.
TYPESOFTHERMOGRAPHIC CAMERA
SingleSensors-Inthisasinglesensoris
usedhavingrotatingmirror.
FPA-Inthisanarrayofdetectorsareusedfor
providinginformationaboutradiatedpoint.

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WORKING OF INFRARED THERMOGRAPHY IMAGER

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SCHEMATIC DIAGRAM OF INFRARED THERMOGRAPHY IMAGER
(4)
(1)
(3)
(2)
CALIBRATION
PIECE
HEATING
1-IR camera
2-Control panel of the camera
3-Direct view on the screen
4 -Signal processing of the acquisition

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TYPE OF THERMOGRAPHY
Thermographyisclassifiedintotwotypes:
ActiveThermography
PassiveThermography
Inactivethermography,anenergysourcearerequiredtoproduce
athermalcontrast.Thedetectioncanbeoccurredeitherhot
(active)orthecold(passive)spotonthesurface.
Inthepassivethermography,inspectedpartareathigheror
lowertemperaturethanthebackground.

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ADVANTAGES
Itisanon-contacttypetechnique.
Alargesurfaceareacanbescannedinnotime.
Presentedinvisual&digitalform.
Softwareback-upforimageprocessingandanalysis.
Requiresverylittleskillformonitoring
PassiveThermography

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DISADVANTAGES
Costofinstrumentisrelativelyhigh.
Unabletodetecttheinside(depth)temperatureifthe
medium.
Accuratetemperaturemeasurementsarehinderedby
differingemissivityandreflectionsfromothersurface.
Theweatherinfluence.

11. Conditionmonitoring
Buildingenvelopeinspectionsandenergylossesinbuildings
Thermalmapping
Digitalinfraredthermalimaginginhealthcare
Archaeologicalkiteaerialthermography
VeterinaryThermalImaging
Nightvision
UAVSurveillance
Research
Processcontrol
Non-destructivetesting
Surveillanceinsecurity,lawenforcementanddefence
Chemicalimaging
Volcanology
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APPLICATIONS OF IR RADIATIONS -INDUSTRIAL, SCIENTIFIC AND MEDICAL

12. CA. Atul Kumar Gupta
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Region of Interest for further Diagnosis
Hottest Region Detection
Segmentation
Abnormal
Classification
Feature Extraction
Image Pre-Processing
Thermography Images

14. Ramya Devi R
Research Scholar
Email: [email protected]
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