What is a Scan Reflectance Profile?
The scan reflectance profile is analysed in terms of a series of parameters. A number of these are reflectance-related, such as Maximum and Minimum Reflectance, Symbol Contrast, Defects, Edge Contrast and Modulation, while some bear more relationship to dimensional features (Decodability and Bar Width Gain/Loss). These parameters have been shown both to be measurable from the profile and to have an effect on scanning performance. First, the profile is divided into candidate bar and space regions by setting a Global Threshold midway between the highest light reflectance (Rmax) and the lowest dark reflectance (Rmin) measured anywhere in the scan; areas above the Global Threshold are treated as spaces and those below it as bars. For the detailed parameter analysis, each element edge position is determined, not where the profile crosses the Global Threshold, but where it passes through the reflectance value midway between the peak reflectance of the adjoining space and the lowest reflectan
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