In any camera-based application the illumination is a critical part of the
system. At the most basic level, there must be enough light so that the camera
can acquire a good image. Beyond this it is almost always necessary to use the
orientation, geometry or colour of light to highlight relevant details or
minimise the appearance of unhelpful parts of the image, such as glare.
Getting the illumination right simplifies analysis, indeed it may be critical
to an inspection.
