Ibrahim, Z., I. Ibrahim, K. Khalil, S. W. Nawawi, M. A. Abdul Rahim, Z. Aspar, and W. K. Wan Ahmad. “Noise Elimination for Image Subtraction in Printed Circuit Board Defect Detection Algorithm”. INTERNATIONAL JOURNAL OF COMPUTERS &Amp; TECHNOLOGY, vol. 10, no. 2, Aug. 2013, pp. 1317-29, doi:10.24297/ijct.v10i2.7000.