Signal detection in power-law noise: effect of spectrum exponents

被引：71

作者：

Burgess, Arthur E. ^{[1
]}

Judy, Philip E. ^{[1
]}

机构：

[1] Harvard Univ, Sch Med, Brigham & Womens Hosp, Boston, MA 02115 USA

来源：

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION | 2007年 / 24卷 / 12期

关键词：

D O I：

10.1364/JOSAA.24.000B52

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Many natural backgrounds have approximately isotropic power spectra of the power-law form, P(f)=K/f(beta) , where f is radial frequency. For natural scenes and mammograms, the values of the exponent, 6, range from 1.5 to 3.5. The ideal observer model predicts that for signals with certain properties and backgrounds that can be treated as random noise, a plot of log (contrast threshold) versus log (signal size) will be linear with slope, m, given by: m = (beta-2)/2. This plot is referred to as a contrast-detail (CD) diagram. It is interesting that this predicts a detection threshold that is independent of signal size for beta equal to 2. We present two-alternative forced-choice (2AFC) detection results for human and channelized model observers of a simple signal in filtered noise with exponents from 1.5 to 3.5. The CD diagram results are in good agreement with the prediction of this equation. (C) 2007 Optical Society of America

引用

页码：B52 / B60

页数：9

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