14 April 2000 Estimates of human-observer templates for a simple detection task in correlated noise
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Abstract
An observer template encapsulates the relative weight assigned to each pixel by an observer performing a detection or discrimination task. In previous work, Abbey et Al. (Proc. SPIE 3663, 1999.) have developed a methodology for estimating human-observer templates in two-alternative forced-choice detection and classification experiments. The methodology assumes a linear observer, and is designed for use on images with noise that is Gaussian distributed. In this work, the methodology is used to evaluate human-observer templates for tasks in correlated Gaussian noise. We consider detection of a Gaussian 'bump' signal in image noise that has either lowpass or highpass correlation structures, as well as white- noise task for reference. The estimated templates show that the human observers are sensitive to the correlation structure of the noise (as expected). However, the human-observer templates do not appear to fully adapt to noise correlations as the ideal observer does.
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Craig K. Abbey, Craig K. Abbey, Miguel P. Eckstein, Miguel P. Eckstein, "Estimates of human-observer templates for a simple detection task in correlated noise", Proc. SPIE 3981, Medical Imaging 2000: Image Perception and Performance, (14 April 2000); doi: 10.1117/12.383092; https://doi.org/10.1117/12.383092
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