28 January 2008 Robust estimation of print mottle
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Abstract
Mottle is a common defect in printing. Mottle evaluation is crucial in image quality assessment and system diagnosis. In this paper, we present a new automatic mottle estimation method which improves the existing technologies in two aspects. First, a modified mottle noise frequency range is proposed, which further separates the banding and streak spectra from mottle spectrum. Second, a robust estimation algorithm is introduced. It is less sensitive to the outliers that may appear in the measurement. These outliers include other defects within the mottle frequency range, such as spots, or defects outside of mottle frequency range, but are strong enough that can not be completely eliminated by normal spatial filtering.
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Zhigang Fan, Wencheng Wu, Edul N. Dalal, Rene Rasmussen, "Robust estimation of print mottle", Proc. SPIE 6808, Image Quality and System Performance V, 680808 (28 January 2008); doi: 10.1117/12.764855; https://doi.org/10.1117/12.764855
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