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

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationTable 9 is extended with minimum dimensions for common 2-finger and 3-finger combinations 16 . Note that mobile devices can use the codes defined inthe above table, as well as those presented below.Finger positionFingercodeMin Width(mm) (in)Min Length(mm) (in)2-Finger CombinationsRight index/middle 40 40.6 1.6 38.1 1.5Right middle/ring 41 40.6 1.6 38.1 1.5Right ring/little 42 40.6 1.6 38.1 1.5Left index/middle 43 40.6 1.6 38.1 1.5Left middle/ring 44 40.6 1.6 38.1 1.5Left ring/little 45 40.6 1.6 38.1 1.5Right index/ Left index 46 40.6 1.6 38.1 1.53-Finger CombinationsRight index/middle/ring 47 63.5 2.5 38.1 1.5Right middle/ring/little 48 63.5 2.5 38.1 1.5Left index/middle/ring 49 63.5 2.5 38.1 1.5Left middle/ring/little 50 63.5 2.5 38.1 1.510.5 Field 4.005: Image scanning resolution / ISRThis field is mandatory. It shall contain a value of “0” if the minimum scanningresolution of 500 ppi is used and a “1” if the native scanning resolution is used.The preferred transmitting resolution (500 ppi to 520 ppi) shall be the same asthe minimum scanning resolution.10.6 Field 4.006: Horizontal line length / HLLThis mandatory field shall be used to specify the number of pixels contained on asingle horizontal line of the transmitted image.Brad Wing 6/19/10 5:07 PMComment: Footnote revised for clarityBrad Wing 6/19/10 5:07 PMComment: Revised for clarity on resolutions.16No maximum dimensions are included, but there are practical maximum upper limits to the image size. The minimumareas for codes 42, 45, 48 and 50 may not be sufficient for practical use. The actual size will depend upon the equipmentused.It should be noted that codes 13-15 and 40-50 are for simultaneous 2 and 3 and 4 – finger combinations. The titlesof the finger combinations are given from the thumb outwards (that is, left to right for the right hand and right to left for theleft hand). Code 46 “Right index / Left index” means that the right index placed on the right portion of the imaging areaand the left index on the left portion of that same imaging area.34DRAFT 2