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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 VERSIONF.6 Extended friction ridge feature set fields – detailedinstructionsThe following sections provide additional definition or examples <strong>for</strong> some of the EFS fieldsdescribed in the main text.F.6.1 Location and orientation fieldsThese fields define where the impression is located in the image, how it is oriented, and the typeof impression(s) present. Fields are described in this section only if there are additionalinstructions and guidance beyond that covered in the Sections comprising 8.9.7 ExtendedFeature Set. The fields in this grouping are:• Field 9.300: EFS region of interest / ROISee 8.9.7.0.2 EFS region of interest in Section 8.9.7 <strong>for</strong> morein<strong>for</strong>mation about the ROI. With the exception of Field 9.323: EFScenter point of reference / CPR, all other fields are in relation to theROI defined in this field, and not the original image.• Field 9.301: EFS orientation / ORT• Field 9.302: EFS finger - palm - plantar position / FPPF.6.1.2 Field 9.301: EFS orientation / ORT instructionsWhile arbitrary rotation of the image is not recommended due to image degradation concerns,rotation of the image in multiples of 90° can be per<strong>for</strong>med without image degradation and isacceptable. See Section 8.9.7.2 <strong>for</strong> a description of the in<strong>for</strong>mation items contained in this field.Figure 30: Example of orientation: -25 ± 20 degreesMay, 2013 DRAFT VERSION UPDATE 2013 Page 489

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