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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION8.14.20 Field 14.021: Finger segment position / SEGThis optional field shall contain offsets to the locations of image segments containing theindividual fingers within the flat images of simultaneous fingers from each hand or the twosimultaneous thumbs. This field shall only be present if FGP = 13, 14, 15 or 40-50 fromTable 8 as entered in Field 14.013: Friction ridge generalized position / FGP. Thesubfield occurs at least once, and may be repeated if more than one algorithm is used tosegment the image. Each subfield contains five information items.• The first information item is the friction ridge segment position / FRSPwith values of 1 to 10 or 16 or 17, selected from Table 8. This informationitem is called the friction ridge segment position / FRSP to differentiate itfrom FGP.• The second information item is the left horizontal coordinate value / LHC.It is the horizontal offset in pixels to the left edge of the bounding boxrelative to the origin positioned in the upper left corner of the image.• The third information item is the right horizontal coordinate value / RHC.It is the horizontal offset in pixels to the right edge of the bounding boxrelative to the origin positioned in the upper left corner of the image.• The fourth information item is the top vertical coordinate value / TVC isthe vertical offset (pixel counts down) to the top of the bounding box.• The fifth information item is the bottom vertical coordinate value /BVC. It is the vertical offset from the upper left corner of the image downto the bottom of the bounding box. It is counted in pixels.8.14.21 Field 14.022: NIST quality metric / NQMThis optional field shall contain the NIST Fingerprint Image Quality (NFIQ) scores forthe individual finger(s) derived from the slap impressions or individual rolledfingerprints. It consists of two information items.• The first item is the friction ridge NIST quality position / FRNP betweenone and ten or 16 or 17, as chosen from Table 8. This information item iscalled the friction ridge NIST quality position / FRNP to differentiate itfrom FGP.• The second item is the NIST image quality score / IQS which is aquantitative expression of the predicted AFIS matcher accuracy performanceof the fingerprint image. The scores range from “1” for the best qualityimage, to “5” for the worst quality image. A “254” indicates that no scorewas ever computed while an entry of “255” shall indicate a failed attempt tocalculate the image quality metric.May, 2013 DRAFT VERSION UPDATE 2013 Page 321