What is industrial machine vision?
Industrial machine vision is the set of technologies that lets machines capture and analyse images to make automatic decisions. In an industrial context, that means using cameras, controlled lighting and image-analysis software to perform tasks that previously required human visual inspection: verifying that a part has no defects, measuring critical dimensions, reading barcodes or QR codes, identifying products on a line or guiding a robot to the correct position.
An industrial machine vision system works at speeds and consistency impossible for the human eye: it can inspect thousands of parts per hour, at line speeds of several metres per second, detecting tenths-of-a-millimetre defects with 100% repeatability. It doesn't tire, doesn't get distracted, and automatically logs the results of every inspection.
Components of a machine vision system
Industrial camera
Industrial cameras are very different from consumer cameras: they are designed to run 24/7 in environments with dust, vibrations and temperature changes; they have deterministic interfaces (GigE Vision, USB3 Vision, Camera Link, CoaXPress) that guarantee synchronisation with the process; and they can be area-scan (capturing a full frame) or line-scan (one pixel wide, for inspection of materials in continuous motion). Resolution ranges from 0.3 megapixels for simple applications up to 100+ megapixels for high-resolution detail inspection.
Industrial lighting
Lighting is critical and often the single biggest factor in the success of a vision system. Different lighting techniques highlight different part features: diffuse front lighting (matt surfaces), backlighting (contours and transparencies), grazing light (relief and textures), structured light (3D shapes), ultraviolet (fluorescence and adhesives), infrared (through plastics).
Optics and lenses
The lens determines the field of view, depth of field and spatial resolution. Telecentric lenses are especially valuable for dimensional measurement: they keep the same magnification regardless of object-camera distance, eliminating perspective error.
Image-processing software
The brain of the system. Classic image-processing tools (filters, thresholding, morphology, blob analysis, pattern matching) are combined today with deep-learning neural networks for the detection of complex defects that aren't easily describable with geometric rules.
Main industrial applications
Quality inspection and defect detection
The most common application: verifying that each part produced meets the quality specs. Detection of cracks, porosity, flash, burn marks, short shots, contaminants, bubbles in plastic, surface defects on metals, label print errors. Inline 100% inspection replaces or complements statistical sampling, reducing the risk of defective parts reaching the customer.
Dimensional verification
Measurement of diameters, lengths, angles, gaps and steps with micrometre precision. Essential on precision parts for automotive, aerospace and medical devices. 3D vision systems (laser profilometry, structured light, stereoscopy) make it possible to measure the full part shape, not just 2D projections.
Code reading and label verification
Reading of 1D and 2D barcodes (QR, Data Matrix, PDF417) for traceability. Verification that labelling is correct: that the code is readable, that it contains the right information, that the use-by date is correct. Very common in food, pharmaceutical and logistics industries.
Robot guidance
Vision systems guide the robot to the exact position of the part to pick or assemble, compensating for position variations. Essential in bin-picking applications (picking parts from a bulk bin) and in the assembly of products with tight tolerances.
Presence and assembly checking
Verifying that every component is present and correctly assembled: screws tightened (head verification), gaskets installed, connectors plugged, caps fitted. One of the most effective applications for eliminating assembly errors before the product reaches the customer.
Main machine vision system manufacturers
- Cognex: world leader in machine vision. Their In-Sight systems are very popular standalone smart cameras for standard applications. DataMan for code reading. VisionPro and ViDi (deep learning) for advanced applications.
- Keyence: Japanese manufacturer with a strong presence in Europe. CV and IV series for general inspection and high-precision measurement systems (LJ series for laser profilometry).
- Sick: strong in code readers and cameras integrated into sensors. Inspector for vision applications and Lector for code reading.
- Basler: German manufacturer of high-quality industrial cameras. Their cameras are paired with software such as Halcon (MVTec) or their own pylon Viewer.
- Teledyne DALSA: specialists in high-speed line-scan cameras for inspection of materials in continuous motion.
At Bluemation we integrate machine vision systems into automation cells: selecting the right system, designing the lighting, programming the image processing and integrating it with the line PLC for reject control and data logging. Tell us about your application.