Image registration for automated inspection of printed circuit patterns using CAD reference data

Automatic Optical Inspection of Micro Drill Bit in Printed Circuit Board Manufacturing Based on Pattern Classification

“…Given a new input drill bit blade image, we calculate the distance D to each class by a weighed Euclidean distance as the following function. D = t) (X -X )2enter + t2 (Y-renter) + 3 (Z -Zenter (6) where Xis the length, Yis the width, Zis area, is the weight for each feature which depends on the application, and (Xcenter, Ycenter, Zcenter) is the center of each class, which is calculated by n n n Y,XI EYY,Y,Zi (Xcenter n Ycenter n z center…”

A Hybrid Image Alignment System for Fast and Precise Pattern Localization

“…This approach depends heavily on the robustness and accuracy of the extraction of geometric features. In addition, Rodriguez and Mandeville [12] proposed an image registration technique by fitting feature points in the zero-crossings extracted from the inspection image to the corresponding points extracted from the CAD model via an affine transformation. However, it is not easy to reliably establish the correspondence between the two set of feature points.…”