Equipment in the construction are inspected such as pipes are threads per inch and pitch. Picture Lighting is very important to properly sense the part. There are mainly four ways to illuminate the part. Front lighting is the most common and easiest to install. Diffused back lightning using many lights large nearby source such as sunlight on a cloudy day produces no shadows or reflections.
Structured light produces a line or point used to establish presence, orientation, and contour.
Strobes such as the ones used to separate berries is a structured light for high speed processes. The fourth method of lighting is collimated back which can be used to enlarge a small part for attribute verification. The vision sensing cameras optically sense the presence of the object. The charge coupled device such as a digital camera store the images digitally. The RS-170 is the most common camera in machine vision.