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Proceedings Paper

Applications of recognition model to images of simulated vehicles
Author(s): Averil M. Macdonald; Alison M. Fairhurst; Alan H. Lettington
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Paper Abstract

A computer model has been developed to predict the probability of recognition of particular shapes when viewed through a thermal imager employing either scanned or focal plane array detectors. This model is based on the results of a series of psychophysical trials during which human observers have considered over 120,000 images of shapes having a range of initial contrasts, and which have been degraded by various combinations of blurring and sampling. These computer generated images were presented to the observers in a random order and with a random degradation, using programs to select images and display them on a computer monitor. After each presentation the observer decided which was the most likely shape to represent the image displayed on the screen. The responses collected have been used to calculate the human recognition probability of each image. A correlation has been found between the probability of recognition of any specified degraded shape and the relative contrast between the image of that shape, and the image of a similarly degraded circle of the same area. This model has been extended to include the effects of fixed pattern noise and applied to simplified images of cars and vans.

Paper Details

Date Published: 26 August 1998
PDF: 7 pages
Proc. SPIE 3377, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IX, (26 August 1998); doi: 10.1117/12.319386
Show Author Affiliations
Averil M. Macdonald, Univ. of Reading (United Kingdom)
Alison M. Fairhurst, Univ. of Reading (United Kingdom)
Alan H. Lettington, Univ. of Reading (United Kingdom)


Published in SPIE Proceedings Vol. 3377:
Infrared Imaging Systems: Design, Analysis, Modeling, and Testing IX
Gerald C. Holst, Editor(s)

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