Automatic PCB inspection algorithms: a survey
Computer Vision and Image Understanding
Signal Analysis: Wavelets, Filter Banks, Time-Frequency Transforms and Applications
Signal Analysis: Wavelets, Filter Banks, Time-Frequency Transforms and Applications
Multi-Noise Removal from Images by Wavelet-Based Bayesian Estimator
ISMSE '04 Proceedings of the IEEE Sixth International Symposium on Multimedia Software Engineering
Wavelet video compression using region based motion estimation and compensation
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 2001. on IEEE International Conference - Volume 03
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In electronics mass-production manufacturing, printed circuit board (PCB) inspection is a time consuming task. Manual inspection does not guarantee that PCB defects can be detected. In this paper, a spatial filtering and wavelet-based automatic optical inspection system for detect PCB defects is presented. This approach combines wavelet image compression utility and spatial filtering. Defects are detected by subtracting the approximations of reference image wavelet transform and test image wavelet transform followed by a median filter stage. Finally, defect image is obtained by computing the inverse wavelet transform. Advantages of this approach are also described.