Experimental investigation of aliasing in the assessment of sampled images

Joseph van der Gracht; Gary W. Euliss; Victor Paul Pauca

doi:10.1117/12.477570

30 July 2002 Experimental investigation of aliasing in the assessment of sampled images

Joseph van der Gracht, Gary W. Euliss, Victor Paul Pauca

Proceedings Volume 4736, Visual Information Processing XI; (2002) https://doi.org/10.1117/12.477570
Event: AeroSense 2002, 2002, Orlando, FL, United States

Abstract

Many visible and infrared sampled imaging systems suffer from moderate to severe amounts of aliasing. The problem arises because the large optical apertures required for sufficient light gathering ability result in large spatial cutoff frequencies. In consumer grade cameras, images are often undersampled by a factor of twenty times the suggested Nyquist rate. Most consumer cameras employ birefringent blur filters that purposely blur the image prior to detection to reduce Moire artifacts produced by aliasing. In addition to the obvious Moire artifacts, aliasing introduces other pixel level errors that can cause artificial jagged edges and erroneous intensity values. These types of errors have led some investigators to treat the aliased signal as noise in imaging system design and analysis. The importance of aliasing is dependent on the nature of the imagery and the definition of the assessment task. In this study, we employ a laboratory experiment to characterize the nature of aliasing noise for a variety of object classes. We acquire both raw and blurred imagery to explore the impact of pre-detection antialiasing. We also consider the post detection image restoration requirements to restore the in-band image blur produced by the anti-aliasing schemes.

Citation Download Citation

Joseph van der Gracht, Gary W. Euliss, and Victor Paul Pauca "Experimental investigation of aliasing in the assessment of sampled images", Proc. SPIE 4736, Visual Information Processing XI, (30 July 2002); https://doi.org/10.1117/12.477570

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