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Tchan: Forensic examination of laser printers and photocopiers using digital image analysis… Figure 10. A comparison of the text character area down line 1 of the W test pages. Left, for 3 adjacent pages; right, their average. the time-consuming nature of recording the measurements and associated time constraints of the researcher. The time problem was only discovered during the experimental phase and centered on alignment difficulties of the text characters in the image window. The left-hand graphs of Figures 10–13 show the individual data from the three sheets and on the right-hand side their averages. It was shown that the peak size, the average intensity and the size measurements yielded useful information for the classification process. The position of the image peak 304 J. Imaging Sci. Technol. 514/Jul.-Aug. 2007
Tchan: Forensic examination of laser printers and photocopiers using digital image analysis… Figure 11. A comparison of the text character area across line 1 of the W test pages. Left, for 3 adjacent pages; right, their average. remained constant at either 54 or 55 and provided no useful classification data. It does however provide a useful check on the stability of the illumination levels throughout the period when the measurements were taken. The experimental results using the W template show that all four printing samples could be differentiated by a combination of the J. Imaging Sci. Technol. 514/Jul.-Aug. 2007 305
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