Among the most essentail componnents of today's advanced automated
assembly equipment is machine vision. Machine vision is used for substrate
recognition, component centering and inspection, and machine setup
procedures. The primary task of machine vision is to distinguish features of
interest from the background. This central task is made easier if the input
image has a high degree of contrast. Of the individual parts that make up a
contrast.
Substrate types include FR4, flexible circuits, and ceramics of various colors
and shades.
There are several options for illuminating substrates, they include variations
of: