ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...

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ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information18.19 Field 14.020: Comment / COMThis optional ASCII field may be used to insert comments or other ASCII textinformation with the image data.18.20 Field 14.021: Finger segment position(s) / SEGThis mandatory ASCII field shall contain offsets to the locations of imagesegments containing the individual fingers within the flat images of simultaneousfingers from each hand or the two simultaneous thumbs. (FGP= 13,14,15 or 40-50). There is a subfield (Finger segment by algorithm / FBA) that occurs atleast once, and may be repeated if more than one algorithm is used to segmentthe image. Each subfield contains five information items.The first information item is the finger position number / FGP with values of"FV1" through "FV4". Values of “FV1” to “FV4” specify the boundingcoordinates for each full finger view. For the case of a fingertip, the firstinformation item shall be “TIP”The second information item is the left horizontal coordinate value / LHC. It isthe horizontal offset in pixels to the right relative to the origin positioned in theupper left corner of the image.The third information item is the right horizontal coordinate value / RHC. It isthe horizontal offset in pixels to the right relative to the origin positioned in theupper left corner of the image.The fourth information item is the top vertical coordinate value / TVC is thevertical offset (pixel counts down) to the top of the bounding box.The fifth information item is the bottom vertical coordinate value / BVC. It isthe vertical offset from the upper left corner of the image down to the bottomof the bounding box. It is counted in pixels18.21 Field 14.022: NIST quality metric / NQMThis optional ASCII field shall contain the NIST Fingerprint Image Quality (NFIQ)scores for the individual finger(s) derived from the slap impressions or individualrolled fingerprints. It consists of two information items.The first item is the finger number / FGP between one and ten as chosenfrom Table 9.The second item is the image quality score / QVU which is a quantitativeexpression of the predicted AFIS matcher accuracy performance of thefingerprint image. The scores range from "1" for the best quality image, to "5"for the worst quality image. A "254" indicates that no score was evercomputed while an entry of "255" shall indicate a failed attempt to calculatethe image quality metric.186DRAFT 2
187ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information18.22 Field 14.023: Segmentation quality metric / SQMThis optional ASCII field provides a measure of estimated correctness regardingthe accuracy of the location of the segmented finger within the right or left fourfinger or two thumbs slap image. For each segmented finger, this field shallcontain four information items.This field may contain one or more subfields, each consisting of four informationitems. This subfield (Segmentation quality subfield / QMS) is repeated for eachsegmented finger with coordinates that appear in field 14.021. For the casewhere more than one segmentation algorithm is applied to a multi-finger plainimage, the set of segmentation information items for each finger shall be orderedcorresponding to the entries in field 14.021.The first information item is the code / FGP as chosen from Table 9.The second information item shall be a quantitative expression of thepredicted matching performance of the biometric sample, which is a qualityvalue / QVU. This item contains the ASCII representation of the integerimage quality score between 0 and 100 assigned to the image data by aquality algorithm. Higher values indicate better quality. An entry of “255”shall indicate a failed attempt to calculate a quality score. An entry of “254”shall indicate that no attempt to calculate a quality score was made. The useof additional values to convey other information should be harmonized withISO/IEC 19794 standards.The third information item shall specify the ID of the vendor of the qualityalgorithm used to calculate the quality score, which is an algorithm vendoridentification / QAV. This 4-digit hex value is assigned by IBIA andexpressed as four ASCII characters. The IBIA shall maintain the VendorRegistry of CBEFF Biometric Organizations that will map the value in this fieldto a registered organizationThe fourth information item shall specify a numeric product code assigned bythe vendor of the quality algorithm, which may be registered with the IBIA, butregistration is not required. This is an algorithm product identification /QAP that indicates which of the vendor’s algorithms was used in thecalculation of the quality score. This field contains the ASCII representation ofthe integer product code and should be within the range 1 to 65,535.18.23 Field 14.024: Fingerprint quality metric / FQMThis optional ASCII field is used to specify one or more different metrics offingerprint image quality score data for the image stored in this record. Themeaning attributed to this metric must be defined and interpreted by the producerof the scoring algorithm or by the person or system used to assign the metric tothe fingerprint image. The metric may be a predictor of AFIS matcher accuracyperformance or a different metric to indicate a value associated with the quality ofthe fingerprint image for a particular function.DRAFT 2
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