Master Thesis - Fachbereich Informatik
Master Thesis - Fachbereich Informatik
Master Thesis - Fachbereich Informatik
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
List of Figures<br />
2.1. AccuracyandPrecision ............................. 10<br />
2.2. Parallellinesatperspective ........................... 11<br />
2.3. Pinholegeometry................................. 12<br />
2.4. Thinlensmodel ................................. 13<br />
2.5. Incidentlightingsetups ............................. 18<br />
2.6. Edgemodels ................................... 21<br />
2.7. Comparisonofdifferentedgedetectors..................... 24<br />
2.8. Orientationselectivefilters ........................... 27<br />
2.9. Subpixelaccuracyusinginterpolationtechniques ............... 28<br />
3.1. Hardwaresetupoftheprototype ........................ 32<br />
3.2. BAYERmosaic.................................. 34<br />
3.3. Comparisonofcolorandgraylevelcamera................... 36<br />
3.4. Colorinformationoftransparenttubes..................... 37<br />
3.5. Telecentriclens.................................. 40<br />
3.6. FieldofViewgeometry ............................. 42<br />
3.7. Tubesatdifferentfrontlightingsetups..................... 44<br />
3.8. Backlightingthroughaconveyorbelt ..................... 45<br />
3.9. Polarizedbacklighting.............................. 46<br />
3.10.Backlightpanel ................................. 47<br />
3.11.Blowoutsetup .................................. 48<br />
4.1. Systemoverview ................................. 52<br />
4.2. Potentialimagestates .............................. 53<br />
4.3. Tubemodels ................................... 54<br />
4.4. Measuringplanedefinition............................ 55<br />
4.5. Characteristicintensitydistributionoftransparenttubes........... 57<br />
4.6. Tubeorientationerror .............................. 58<br />
4.7. Cameracalibration-Calibrationimages.................... 60<br />
4.8. Cameracalibration-Subpixelcornerextraction................ 61<br />
4.9. Cameracalibration-Extrinsicparameters................... 61<br />
4.10.Cameracalibration-Radialdistortionmodel ................. 62<br />
4.11.Camerapositioning-OnlineGridCalibration................. 64<br />
4.12.Camerapositioning-controlpoints....................... 65<br />
4.13.Scanlinesforprofileanalysis .......................... 66<br />
4.14.Profileanalysis .................................. 70<br />
4.15.Motivationforaregion-basedprofilethreshold ................ 72<br />
4.16.Ghosteffect.................................... 73<br />
4.17.Characteristictubeedgeresponses ....................... 79<br />
xiii