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Vision-Doctor

Practice

Planning and realization of applications

Implementation of MV solutions

Production errors occur. Objects need to be detected. A component needs to be accurately measured. Production steps are monitored and readjusted. Fonts and codes are to be read. Where do anomalies occur?

The implementation of such a task can be very complex. What does the quality inspector really mean when he talks about a "component measurement"? What are the technical limits? Under what conditions can this be done?

VDI / VDA / VDMA 2632-2: Implementation of the tasks

Again, the "Specifications for the Planning and Implementation of Vision Systems (VDI / VDA / VDMA 2632-2)" provide a lot of information on what needs to be considered.

The perfect guide for describing:

  • Type of task
  • Acceptance procedure
  • Calibration of the system
  • Which software algorithms are used?
  • Hardware and inspection technology used, e.g. area scan camera, line scan camera, 3D solution etc.
  • Required resources
  • Time schedule

The inspection task - what to do?

Uncalibrated inspection tasks

Not traced back to standards and calibration norms

  • Feature detection (presence/absence)

  • Dimensional testing / "pseudo-measurements

  • Defect detection

  • Contour and deformation check

  • Object Search & Pick & Place

  • Optical Character Recognition / Verification (OCR / OCV)

  • 1D and 2D code reading and grading

  • Colour identification

  • Print inspection

  • Deep Learning  classification, Anomaly detection

Real value measurements

Traceable to SI units, e.g. radiometric values, true colour measurements, calibrated

  • "Real" (metric and calibrated) measurements

  • Measuring length, width, height

  • Angle, rotation, parallelism

  • Surface roughness (Ra, Rz values etc)

  • Volume measurements

  • 1D / 2D code verification (calibrated, 15415. ISO TR 29158, AIM DPM)

  • Radiometric, standardised light measurements

  • Colour measurements with standardised colour spaces

Real-value measurements - absolutely necessary?

The correct measurement of physical quantities and standards is time consuming and expensive

  • Traceability of the somehow measured values to standardised values
  • Fixed standardised procedure
  • Calibration / certified targets
  • Periodic recalibration of test specimens
  • Cp, cpk, repeatability, linearity, stability, six_sigma...
  • Large amount of work and much higher costs!

Is all this really necessary? What is your task? What tolerances are desired or required?

Is it enough to say that the component is bent by approx. 2 degrees and is too long or too short by this value, deviating from the ideal, or does this have to be strictly metric?

Attention:

Address these topics! Offline laboratory procedures under standard conditions are a different world, inline camera tests are often limited and difficult to replicate.

The system specification of an integrator/ service provider

Based on the end customer's specifications, the service provider can develop a solution for the desired application.

  • Tasks can often be solved using different technologies, for example a 2D or alternatively a 3D camera solution. What are the benefits of the preferred solution?
  • Or is an intelligent camera system or a specialised PC-based solution required?

Close consultation between the customer and the client helps here. For example, end users may not be able to provide all the information required for a specification. The end customer's preferences will also help the integrator to find a suitable solution for the customer.

  • Full description of the inspection task

  • Developed solution for this task

  • Definition of the necessary hardware setup

  • Used inspection algorithms

  • Mechanical setup for integration

  • Interfaces and communication

  • Calibration & capability verification methods

  • Information about the user interface

  • Details on installation, commissioning & maintenance

  • Time schedule for the project

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Bild Übersicht BV-Systeme / industrielle Bildverarbeitung