Digital Color Halftoning
Digital Image Processing
Detecting regular patterns using frequency domain self-filtering
ICIP '97 Proceedings of the 1997 International Conference on Image Processing (ICIP '97) 3-Volume Set-Volume 1 - Volume 1
Detecting irregularities in regular patterns
ICPR '06 Proceedings of the 18th International Conference on Pattern Recognition - Volume 03
Framework for Applying Full Reference Digital Image Quality Measures to Printed Images
SCIA '09 Proceedings of the 16th Scandinavian Conference on Image Analysis
Visual print quality evaluation using computational features
ISVC'07 Proceedings of the 3rd international conference on Advances in visual computing - Volume Part I
Machine vision based quality control from pulping to papermaking for printing
Pattern Recognition and Image Analysis
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Regular patterns, as defined in this study, are found in areas of industry and science, for example, halftone raster patterns used in the printing industry and crystal lattice structures in solid state physics. The need for quality inspection of products containing regular patterns has aroused interest in the application of machine vision for automatic inspection. Quality inspection typically corresponds to detecting abnormalities, defined as irregularities in this case. In this study, the problem of irregularity detection is described in analytical form and three different detection methods are proposed. All the methods are based on characteristics of the Fourier transform to compactly represent regular information. The Fourier transform enables the separation of regular and irregular parts of an input image. The three methods presented are shown to differ in their generality and computational complexities.