Patent ID: 6665433
Filing Date: 2003-12-16
Classification: G06T

Abstract:
A device for inspecting electrical connections on a circuit board comprising:a processor which controls the acquisition of a cross-sectional image of a cutting plane of the electrical connection at an image plane and analyzes said cross-sectional image, said processor configured to implement the following: a Z-axis controller for varying a Delta Z value, i.e., the Z-axis distance between the image plane and a reference Z-axis position, and acquiring a plurality of Delta Z images of the electrical connection at a plurality of said Delta Z values; an image gradient section which calculates and stores a plurality of gradients for each of said plurality of Delta Z images; a variance calculator section which determines a variance of said plurality of gradients for each of said plurality of Delta Z images; and a comparator which compares said variances of said gradients for each of said plurality of Delta Z images.