| Visual image quality assessment with sensor motion: effect of recording and presentation velocity. | |
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MedLine Citation:
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PMID: 20090798 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To assess the effect of motion on observer performance with an undersampled uncooled thermal imager, moving imagery from a static scene was recorded at nine different angular velocities ranging from 0 (static) to 1 pixel/frame by use of a tilted rotating mirror. The scene contained a thermal acuity test chart with triangular test patterns based on the triangle orientation discrimination test method. Visual acuity with the sensor was determined in two playback modes: normal speed and slow motion. In both playback conditions, a slow angular velocity of the test pattern over the sensor focal plane (up to 0.25 pixel/frame) results in a large acuity increase (+50%) in comparison with the static condition because the observer is able to utilize more phases of the same test pattern. At higher sensor velocities the benefit rapidly decreases due to sensor smear, and above 0.50 pixel/frame the difference with the static condition is marginal. Up to 0.75 pixel/frame, the results for the two playback conditions are similar, indicating that temporal display characteristics and human dynamic acuity are not responsible for the reduction. The results obtained with this laboratory test method correspond well with earlier perception studies on real targets for low and medium camera motion. |
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Authors:
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Piet Bijl |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Applied optics Volume: 49 ISSN: 1539-4522 ISO Abbreviation: Appl Opt Publication Date: 2010 Jan |
Date Detail:
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Created Date: 2010-01-21 Completed Date: 2010-03-22 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0247660 Medline TA: Appl Opt Country: United States |
Other Details:
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Languages: eng Pagination: 343-9 Citation Subset: IM |
Affiliation:
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TNO Defense, Security, and Safety: Human Factors, P.O. Box 23, 3769 ZG Soesterberg, The Netherlands. piet.bijl@tno.nl |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Algorithms Humans Image Processing, Computer-Assisted Motion Optical Devices Optical Phenomena Signal Processing, Computer-Assisted Visual Acuity / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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