Validation of the NPWE model observer to predict the CDMAM performance

Craig K. Abbey; Miguel P. Eckstein

doi:10.1117/12.843653

13 May 2010 High human-observer efficiency for forced-localization tasks in correlated noise

Craig K. Abbey, Miguel P. Eckstein

Proceedings Volume 7627, Medical Imaging 2010: Image Perception, Observer Performance, and Technology Assessment; 76270R (2010) https://doi.org/10.1117/12.843653
Event: SPIE Medical Imaging, 2010, San Diego, California, United States

Abstract

We investigate signal-known-exactly (SKE) detection and free localization tasks in correlated noise having a power-law power spectrum. In all cases the target is an additive focal Gaussian "bump" signal. We compare the performance of human observers in psychophysical studies to that of the Bayesian ideal observer for both tasks in the form of the observer efficiency. We find efficiencies that range from 40% to 60% in the SKE detection task, consistent with previous works. Observer efficiency is considerably higher in the free-localization task, ranging from 60% to 80%. Direct estimation of the human-observer spatial-frequency weights shows clear evidence of a shift to higher frequencies with increasing power-law exponent in both tasks. Our results suggest that human observers are performing some sort of limited prewhitening of stimuli in both tasks.

Citation Download Citation

Craig K. Abbey and Miguel P. Eckstein "High human-observer efficiency for forced-localization tasks in correlated noise", Proc. SPIE 7627, Medical Imaging 2010: Image Perception, Observer Performance, and Technology Assessment, 76270R (13 May 2010); https://doi.org/10.1117/12.843653

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