methods for the analysis of printed circuit boards by means of arithmetic comparisons of several images in different colors.

摘要

The inspection method comprises conducting an arithmetic comparison operation on a number of colour pictures of different colours taken of the base printed circuit board mounted with the component parts. A distinction is made between parts of the base printed circuit board not occupied by the component parts, and component parts. One of the base printed circuit board and the component parts is tinted in a colour of a category selected from the group consisting of the green category, the red category and the yellow category. The arithmetic operation is division.