Fraunhofer IIS Use Case Polarization Image Processing System 2017/01/12 • Novel polarization image sensor and camera system developed at Fraunhofer IIS • Polarization: physical property of light (like wavelength and intensity), but not perceivable to humans • Used in industrial applications like quality monitoring in glass or carbon fibre production • Medical applications are currently in research • Currently, PC software for image processing is available; image analysis is highly application dependent and customer specific • Software development in the traditional way: Matlab simulation, conversion to C/C++, optimization for target architecture, debugging, profiling… • ARGO workflow will drastically reduce time-to-market (factor of 3...5 expected) • In the future, parts of the algorithm will be implemented on embedded systems (inside the camera) Keywords: Worst case execution time, embedded system, safety critical, model based design This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 688131
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FraunhoferIISUseCasePolarizationImageProcessingSystem2017/01/12
• NovelpolarizationimagesensorandcamerasystemdevelopedatFraunhoferIIS• Polarization:physicalpropertyoflight(likewavelengthandintensity),butnot
perceivabletohumans• Usedinindustrialapplicationslikequalitymonitoringinglassorcarbonfibre
production• Medicalapplicationsarecurrentlyinresearch• Currently,PCsoftwareforimageprocessingisavailable;imageanalysisishighly
applicationdependentandcustomerspecific• Softwaredevelopmentinthetraditionalway:Matlabsimulation,conversionto
C/C++,optimizationfortargetarchitecture,debugging,profiling…• ARGOworkflowwilldrasticallyreducetime-to-market(factorof3...5expected)• Inthefuture,partsofthealgorithmwillbeimplementedonembeddedsystems
(insidethecamera)Keywords:Worstcaseexecutiontime,embeddedsystem,safetycritical,modelbaseddesignThisprojecthasreceivedfundingfromtheEuropeanUnion’sHorizon2020researchandinnovationprogrammeundergrantagreementNo688131
ChallengesPolarizationimageprocessingsystemisusedastestcaseintheARGOproject
• Testcaseincrement1containsmostcommonprocessingsteps(commontoalmostallapplications)
• Testcase2willcontaincomputationintensiveenhancementsandapplicationspecificprocessingsteps.Morechallengingw.r.t.WCETconstraints
Solution
• ModelintheLoop:SimulationPC• HardwareintheLoop:ARGOplatform
Phase1:Infrastructurebuildupandtest:
• ImplementScilabmodelandinfrastructuresoftware,hardwaresetup• Recordshortsequencesofrawdata(=testdata)fromthepolarizationcamera
(~2000framespersequence,~50sec)• ProcesstestdataintheScilabPIPSmodel,eachresultinginaAOMPandDOLP
sequence(=referencedata)Phase2:ModelintheLooptest
• Transmitpreviouslyrecordedtestdatasequencesvia EthernetframewisetoasimulationPC(alsorunningthePIPSmodel)andreceiveprocessedframes
• CompareresultsfromsimulationPCtoreferencedata.Theymustbeexactlyidentical.
• NoWCETconstraintsapplicableinthisphasePhase3:Hardwareinthelooptest:(byendoftestcase1)
• TransmittestdatasequencesviaEthernetframewisetotheARGOtargethardware(runningthecompiled andWCET-optimizedPIPSmodel)andreceiveprocessedframes.
• Useincreasingframeratesforstressingthetargetsystem.• Resultsfromthetargetshouldbeidenticaltoreferencedataexceptforround-off
effectscausedbyarithmeticprecisiononthetarget.
DetailsoftheScilabPIPSModelItcoversthemostcommonstepsusedinalmosteverypolarizationimagingapplication.
OutlookforTestcaseIncrement2• Polynomialbasedpixellinearizationforhigherprecision(Note:cameramustbe
seenasameasuringinstrumentratherthanavisualimagesource)
• Temperaturecompensation• Applicationspecificprocessing,e.g.ATN(apperenttempernumber)• Enhanceddenoising(↔unweightenedframeaveraging)• Edge-awarepixelinterpolation(↔simpleneighbouraveraging)
ResultsWhatisthebenefitweexpectfromARGO?
• Drasticallyreducedtime-to-market• Reducednumberofiterationsinsoftwaredevelopmentcausedbyerrornous
C-Conversionofsimulationcode• Higherperformanceofresultingimplemenationduetoautomatic
parallelizationandWCETawareness→Moreapplicationareas• Mucheasiermigrationtoothertargetplatforms,i.e.embeddeddevices
Example:ModelintheLoopusingRaspberryPiassimulationplatfom
Moreinfoshttps://www.iis.fraunhofer.de/en/ff/bsy/tech/kameratechnik/polarisationskamera.htmlhttp://scilab.io/use-cases/real-time-embedded-systems-require-higher-performance/
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