Maximum-likelihood and maximum-a-posteriori estimates of human-observer templates

Craig K. Abbey; Miguel P. Eckstein

doi:10.1117/12.431179

26 June 2001 Maximum-likelihood and maximum-a-posteriori estimates of human-observer templates

Craig K. Abbey, Miguel P. Eckstein

Proceedings Volume 4324, Medical Imaging 2001: Image Perception and Performance; (2001) https://doi.org/10.1117/12.431179
Event: Medical Imaging 2001, 2001, San Diego, CA, United States

Abstract

Procedures for direct estimation of observer templates (also known as classification images) have largely focused on unbiased estimates. In this paper we take a different approach, deriving maximum likelihood (ML) and maximum a posteriori (MAP) procedures for estimating an observer template from the outcome of a two-alternative forced-choice experiment. While these estimation procedures will generally result in estimates with some bias, the reduction in variance can potentially outweigh the negative effects of a small bias. One promising feature of the ML and MAP estimates is that the distribution of the sample images used for the experiment is not necessary for evaluating the likelihood term implying that the method is robust to the distribution of images (although the validity of the assumptions used to derive these estimators may not be). It may therefore be possible to use these methods to estimate classification images for detection tasks in realistic images.

Citation Download Citation

Craig K. Abbey and Miguel P. Eckstein "Maximum-likelihood and maximum-a-posteriori estimates of human-observer templates", Proc. SPIE 4324, Medical Imaging 2001: Image Perception and Performance, (26 June 2001); https://doi.org/10.1117/12.431179

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