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An investigation of search pattern extent in the threshold contrast detection task

Regional Medical Physics Department, Newcastle General Hospital, Newcastle-upon-Tyne NE4 6BE, UK

View larger version (20K): [in a new window]   Figure 1. Examples of test images.(a) The 16 pixel diameter disks with no search restriction (other than the limits of the image frame). (b,c) The same diameter with Ds/Dd = 3 and 1.5, respectively.

View larger version (8K): [in a new window]   Figure 2. Contrast-detail plots of the results for the unrestricted search (), and Ds/Dd = 3 (), 1.5 () and 1.125 (). The error bar illustrates a typical±1 standard error on the mean value of threshold contrast for the experiment.

View larger version (11K): [in a new window]   Figure 3. The ratio of threshold contrast for the limited search, normalized to that of the unlimited search, plotted againstDs/Dd, for all four disk diameters: 1.4 mm (•), 2.8 mm (), 5.6 mm () and 11.3 mm ().

View larger version (9K): [in a new window]   Figure 4. The ratio of threshold contrast for the limited search, normalized to that of the unlimited search, plotted againstDs/Dd for the data from Figure 3 averaged across all disk diameters. The error bars show±1 standard error on the mean.