Industrial Vision
Industrial Vision: components
Feed back Image analysis Optics and camera Digitalisation Illumination Object Data Camera with lens (objective) Camera with lens (objective) Illumination system Illumination system Image acquisition system Image acquisition system Image analysis system Image analysis system Computer Computer Network Network Database Database Components:
Typical activities in machine vision Detection (Is the object in view?) Detection (Is the object in view?) Presence detection Presence detection Recognition (What is in view?) Recognition (What is in view?) Multiple classes of objects Multiple classes of objects OCR (Optical character Recognition) OCR (Optical character Recognition) Measurement and Inspection (Good quality?) Measurement and Inspection (Good quality?) Position / size / orientation Position / size / orientation Shape / smoothness / cosmetic inspection Shape / smoothness / cosmetic inspection
Advantages of machine vision No physical contact with object, non destructive method No physical contact with object, non destructive method Versatile Versatile Fast and precise image capture possible Fast 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 details Precision measurements, detection of small details Connection with PLCs or other machines: Connection with PLCs or other machines: Process control Process control Positioning of robot arms: cutting, drilling, welding Positioning of robot arms: cutting, drilling, welding Interface with computers (software) Interface with computers (software) Collection of statistical data Collection of statistical data Quality control Quality control Feedback, e.g. automatic go / no-go decision possible Feedback, e.g. automatic go / no-go decision possible
Disadvantages of machine vision No second chance with products on conveyer belt No second chance with products on conveyer belt System installation requires intensive preparation and study System installation requires intensive preparation and study Custom software development Custom software development Can be expensive (hard- and software) Can be expensive (hard- and software)
User requirements 1 Accuracy Accuracy Absolute / relative Absolute / relative Response on errors Response on errors Interfaces Interfaces Robustness Robustness Varying circumstances Varying circumstances Optically Optically Orientation Orientation (3) sigma (3) sigma
User requirements 2 Acceptance test Acceptance test Environmental conditions Environmental conditions shielding of daylight shielding of daylight vibrations vibrations “Vision” knowledge! “Vision” knowledge! Test set of products Test set of products mm Allowed slip / false reject rates Allowed slip / false reject rates
Expectations Possible Separation of the individual objects Separation of the individual objects Measurement of orientation and size of the objects Measurement of orientation and size of the objects Image Impossible Measurement of the screw thread Measurement of the screw thread Full µm resolution Full µm resolution