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

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationwhere “n” is between 3 and 99. The order of the vertices must be in theirconsecutive order around the perimeter of the polygon, either clockwise orcounterclockwise. No two vertices may occupy the same location. The polygonside defined by the last subfield and the first subfield shall complete the polygon.The polygon must be a simple, plane figure with no sides crossing and no interiorholes.This field shall consist of up three subfields. The field is repeated for eachsegmentation.The first subfield (Finger position code / FPC) is the finger number fromTable 9.The second subfield (Position polygon vertex quantity / VNV) is thenumber of vertices encompassing the segmented finger (between 3 and 99)The third subfield is the vertex information (Position polygon vertex / PPV).It is comprised of two information items:The first information item is the (Position horizontal coordinate value /PHV). It is the horizontal pixel offset (x- across) relative to the originpositioned in the upper left corner of the image.The second information item is the (Position vertical coordinate value /PVV). It is the vertical pixel offset (y - down) relative to the origin positionedin the upper left corner of the image.23.17 Field 19.020: Comment / COMThis optional ASCII field may be used to insert comments or other ASCII textinformation with the image data.23.18 Field 19.024: Plantar print quality metric / XQMThis optional ASCII field is used to specify one or more different metrics ofplantar print 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 plantar print image. The metric may be a predictor of AFIS matcher accuracyperformance or a different metric to indicate a value associated with the quality ofthe plantar print image for a particular function.This field may contain one or more subfields, each consisting of four informationitems. This subfield (Quality Metric Subfield / QMS) is repeated for each plantarimage and quality algorithm used.The first information item is the plantar reference number / FGP chosenfrom Table 9Brad Wing 6/22/10 4:20 PMComment: REVISED TO BE CONSISTENTWITH RECORD TYPE 14241DRAFT 2