2001-03-01 1Industrial VisionIndustrial Vision

2001-03-01 2Industrial Vision: componentsIndustrial Vision: components

2001-03-01 3

Feed back

Image analysis

Optics and camera

Digitalisation

Illumination

Object

Data

• Camera with lens (objective)Camera with lens (objective)• Illumination systemIllumination system• Image acquisition systemImage acquisition system• Image analysis system Image analysis system

• ComputerComputer• NetworkNetwork• DatabaseDatabase

Components:Components:

2001-03-01 4

Typical activities in machine visionTypical activities in machine vision

• Detection (Is the object in view?)Detection (Is the object in view?)• Presence detectionPresence detection

• Recognition (What is in view?)Recognition (What is in view?)• Multiple classes of objectsMultiple classes of objects• OCR (Optical character Recognition)OCR (Optical character Recognition)

• Measurement and Inspection (Good Measurement and Inspection (Good quality?)quality?)

• Position / size / orientationPosition / size / orientation• Shape / smoothness / cosmetic Shape / smoothness / cosmetic

inspectioninspection

2001-03-01 5Advantages of machine visionAdvantages of machine vision

• No physical contact with object, non destructive methodNo physical contact with object, non destructive method

• VersatileVersatile

• Fast and precise image capture possibleFast and precise image capture possible• Capture without blur (use of flash) Capture without blur (use of flash) • OCR (optical character recognition)OCR (optical character recognition)• Precision measurements, detection of small detailsPrecision measurements, detection of small details

• Connection with PLCs or other machines:Connection with PLCs or other machines:• Process controlProcess control• Positioning of robot arms: cutting, drilling, weldingPositioning of robot arms: cutting, drilling, welding

• Interface with computers (software)Interface with computers (software)• Collection of statistical dataCollection of statistical data• Quality controlQuality control• Feedback, e.g. automatic go / no-go decision possibleFeedback, e.g. automatic go / no-go decision possible

2001-03-01 6Disadvantages of machine visionDisadvantages of machine vision

• No second chance with products on conveyer beltNo second chance with products on conveyer belt

• System installation requires intensive preparation and studySystem installation requires intensive preparation and study

• Custom software developmentCustom software development

• Can be expensive (hard- and software)Can be expensive (hard- and software)

2001-03-01 7

User requirements 1User requirements 1• AccuracyAccuracy

• Absolute / relativeAbsolute / relative

• Response on errorsResponse on errors

• Interfaces Interfaces

• RobustnessRobustness• Varying circumstancesVarying circumstances

• OpticallyOptically• OrientationOrientation

• (3) sigma(3) sigma

2001-03-01 8

User requirements 2User requirements 2

• Acceptance testAcceptance test

• Environmental conditionsEnvironmental conditions• shielding of daylightshielding of daylight• vibrationsvibrations

• ““Vision” knowledge!Vision” knowledge!

• Test set of productsTest set of products

321 4

8.0 8.1 8.3 8.1 mm

• Allowed slip / false reject ratesAllowed slip / false reject rates

2001-03-01 9Expectations Expectations

PossiblePossible• Separation of the individual objectsSeparation of the individual objects• Measurement of orientation and size of the objectsMeasurement of orientation and size of the objects

ImageImage

ImpossibleImpossible• Measurement of the screw threadMeasurement of the screw thread• Full µm resolutionFull µm resolution