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Nonlinear filtering in digtal image processing
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]

In this thesis an application named ImageLab have been developed. Image- Lab is an image filtering application focusing on the use of nonlinear filtering processes. During development of the software it became clear that ImageLab is not a full image processing suite, such as Photoshop™, but rather a complement to existing software solutions. This is true for now, but further development of the software may lead it to become an alternative full featured image processing solution. Theory behind the use of ImageLab’s image processing techniques was introduced in section 2, the same techniques was also introduced as pseudocode. Also the different filters and their functionality were explained. In section 4.2 the same pseudo-code were turned into usable C#-code. Following this recipe it should be a straightforward process to duplicate the work done in this thesis, both for novel applications or extending the current application further. In section 5 it was shown how the different filters performed with respect to an objective metric. While not being able to generally conclude a given filters proficiency at removing noise, we can conclude that for a given set of initial conditions (input image, the type/strength of noise and parameters) some filters did perform better than others. With 2-sided variable height impulsive noise and the Lena reference image a median-filter and a Distance Weighted Median-filter performed the best (according to the objective Mean Square Error). All the filters did improve the objective metric, the worst (Mean 11-by-11) was able to remove more than 40%4 of the noise. The best filter (Median 1-by-1) was able to remove more than 90%5 of the noise.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2011. , 49 p.
Keyword [no]
ntnudaim:4673, MTEL elektronikk, Signalbehandling og kommunikasjon
URN: urn:nbn:no:ntnu:diva-15009Local ID: ntnudaim:4673OAI: diva2:473496
Available from: 2012-01-06 Created: 2012-01-06

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