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Recently, the advancement in industrial automation and high-speed printing has raised numerous challenges related to the printing quality inspection of final products. This chapter proposes a machine vision-based technique to assess the printing quality of text on industrial objects. The assessment is based on three quality defects such as text misalignment, varying printing shades, and misprinted text. The proposed scheme performs the quality inspection through stochastic assessment technique based on the second-order statistics of printing. First, the text-containing area on a printed product is identified through image processing techniques. Second, the alignment testing of the identified text-containing area is performed. Third, optical character recognition is performed to divide the text into different small boxes, and only the intensity value of each text-containing box is taken as a random variable, and second-order statistics are estimated to determine the different printing defects in the text under one, two, and three sigma thresholds. Fourth, the k-nearest neighbors (k-NN)-based supervised machine learning is performed to provide the stochastic process for misprinted te

Author

Azhar Hussain; Kamal Bhattarai

Publisher

IntechOpen

Published

2019

Language

EN