The size of the image is 126x71 pixels, and each pixel corresponds approximately to 0.5 mm of the object. Fixed optics versus remotely controlled zoom lenses is a decision that is closely connected with the geometric resolution specification. You can choose between lenses with fixed focal length or zoom type, preferably motorised and remotely controlled. Depending on the size and geometry of the product, you may need to mount the camera on a motorised axis, which in turn will need a motion control board. Moving parts are usually expensive and seldom maintenance free.
Illumination is also a key factor.
While LEDs and displays are self-illuminating, your system requires some form of illumination for the other components of the board. The best type of illuminator for this application uses high-frequency diffused neon strip lights. Application-specific virtual instruments developed using National Instruments' IMAQ Vision Library form part of the vision system user interface. Speed of processing is a critical issue that can directly impact on productivity. You can consider the overall test as a long sequence of separate elementary tests.