Effects of band-limited noise on human observer performance

Salem Salem; Eddie Jacobs; Richard Moore; Maarten Hogervorst; Piet Bijl; Carl Halford

doi:10.1117/12.719417

30 April 2007 Effects of band-limited noise on human observer performance

Salem Salem, Eddie Jacobs, Richard Moore, Maarten Hogervorst, Piet Bijl, Carl Halford

Proceedings Volume 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII; 65430G (2007) https://doi.org/10.1117/12.719417
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

Abstract

Perception tests establish the effects of spatially band-limited noise and blur on human observer performance. Previously, Bijl showed that the contrast threshold of a target image with spatially band-limited noise is a function of noise spatial frequency. He used the method of adjustment to find the contrast thresholds for each noise frequency band. A noise band exists in which the target contrast threshold reaches a peak relative to the threshold for higher- or lower-noise frequencies. Bijl also showed that the peak of this noise band shifts as high frequency information is removed from the target images. To further establish these results, we performed forced-choice experiments. First, a Night Vision and Electronics Sensors Directorate (NVESD) twelve (12)-target infrared tracked vehicle image set identification (ID) experiment, second, a bar-pattern resolving experiment, and third, a Triangle Orientation Discrimination (TOD) experiment. In all of the experiments, the test images were first spatially blurred, then spatially band-limited noise was added. The noise center spatial frequency was varied in half-octave increments over seven octaves. Observers were shown images of varying target-to-noise contrasts, and a contrast threshold was calculated for each spatial noise band. Finally, we compared the Targeting Task Performance (TTP) human observer model predictions for performance in the presence of spatially band-limited noise with these experimental results.

Citation Download Citation

Salem Salem, Eddie Jacobs, Richard Moore, Maarten Hogervorst, Piet Bijl, and Carl Halford "Effects of band-limited noise on human observer performance", Proc. SPIE 6543, Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XVIII, 65430G (30 April 2007); https://doi.org/10.1117/12.719417

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KEYWORDS

Contrast transfer function

Targeting Task Performance metric

Modulation transfer functions

Image quality

Spatial frequencies

Information operations

Infrared imaging

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