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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 VERSION8.9.7.51 Field 9.372: EFS skeletonized image / SIMThis optional field contains a skeletonized image, also known as a ridge tracing, whichreduces the friction ridge impression to an image with thinned representations of each ridge.Incipient ridges, dots, ridge discontinuities, and protrusions are not included in the skeleton.The skeletonized image is a 2-tone image with a white background and a black single-pixelwidethinned representation of each ridge. Each black pixel may have 1, 2, or 3 neighboringblack pixels; other values (0, 4-8) are errors. The same in<strong>for</strong>mation may alternatively berepresented using Field 9.373: EFS ridge path segments / RPS. For more in<strong>for</strong>mationabout skeletonized images, See Annex F F.6.8 Ridge path: skeletonized image and ridgepath segments.The skeletonized image is stored as a 1-bit grayscale PNG compressed image, bit-packed 6bits per character using Base-64 representation (See Annex A: Character encodingin<strong>for</strong>mation). The entire PNG 100 -<strong>for</strong>matted image is included as a single data entry /in<strong>for</strong>mation item. Interlacing, alpha transparency, and color palettes shall not be used. . Theskeletonized image’s dimensions shall be identical width and height of the ROI (See Field9.300: EFS region of interest / ROI). The resolution of the skeletonized image shall be thesame as the original image, and shall be set in the PNG header.8.9.7.52 Field 9.373: EFS ridge path segments / RPSThis optional field contains an alternate representation of the same skeletonized image datacontained in Field 9.372: EFS skeletonized image / SIM. Each ridge path segment issaved as an open path (ordered set of vertices). See Section 7.7.12.1. Multiple segmentsmay be included in this field. Incipient ridges, dots, ridge discontinuities, and protrusions arenot included in the ridge path representation. Each skeletonized ridge segment is stored as aseparate subfield. Each endpoint of a ridge segment is either shared by three ridge segments(at a bifurcation) or is unique to a single ridge segment (at a ridge ending). For morein<strong>for</strong>mation about ridge path segments, See Annex F F.6.8 Ridge path: skeletonizedimage and ridge path segments.[2013a>] In Traditional encoding, the two special characters allowed are hyphen andcomma.[

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