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acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

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ANSI/<strong>NIST</strong>-ITL 1-<strong>2011</strong> - UPDATE 2013 DRAFT VERSIONFigure 41: Example of interrelationships between minutiae, with connecting ridge pathsegments highlightedNote that often ridge path segments are not visible over their entire length due to image clarityproblems or due to being truncated by the edge of the impression, and there<strong>for</strong>e one or bothends of a ridge segment may not end at points defined as minutiae. Effective use of ridge pathrepresentations requires distinguishing between any areas in which the skeleton is debatablerather than definitive. Field 9.308: EFS ridge quality/confidence map / RQM is used <strong>for</strong> thispurpose: Table 122 shows the relationship between the local quality values and the ridge path.Figure 42 shows an example of a skeletonized image with a quality map: black and red areas(quality 0-1) have no skeleton; the yellow areas are poor (quality 2) and the skeletonin<strong>for</strong>mation is not definitive; in other areas the skeleton is definitive.Table 122: Local ridge quality and tracing504

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