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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONtransaction. An implementation domain or application profile may specify that NSR may beused to apply to Type-7 records.Record Type-14 shall be used if scanning a fingerprint image at the 1000 ppi class or above.It can also be used for the 500 ppi class.7.7.6.2.2 Latent image scanner resolution requirementLatent images shall have a minimum scanning resolution of the 1000 ppi class.7.7.6.2.3 Scanner resolution migration pathThe migration path to higher scanning resolutions for image capturing devices with a nativescanning resolution of the 500 ppi class shall be at a rate of 100% of the current nativescanning resolution. The recommended migration path progresses from 19.69 ppmm to39.37 ppmm (500 ppi class to 1000 ppi class), from 39.37 ppmm to 78.74 ppmm (1000 ppiclass to 2000 ppi class), etc. Capture devices with native scanning resolutions not in stepwith this migration path shall provide (through subsampling, scaling, or interpolatingdownward) a nominal resolution that matches the next lower interval in the migration path.For example, a device with native scanning resolution of 47.24 ppmm (1200 ppi) shallprovide a class resolution of 39.37 ppmm (1000 ppi).7.7.6.3 Friction ridge transmitting resolution requirementEach image to be exchanged shall have a specific resolution associated with the transmitteddata. This transmitting resolution does not have to be the same as the scanning resolution.However, the transmitting resolution shall be within the range of permissible resolutionvalues for that record type.7.7.6.3.1 Record Type-4 transmitting resolution requirementWhen an image is captured at a scanning resolution greater than the permissible upper limitof the transmitting resolution of 500 ppi class, the image shall be subsampled, scaled, orinterpolated down. This processing to reduce the scanning resolution to a lower nominalresolution shall be performed before the transmission occurs. Processing to increase theresolution above scanning resolution is not permitted. Field 1.012 Nominal resolution /NTR shall specify the transmitting resolution in pixels per millimeter. It is expressed as twonumeric characters followed by a decimal point and two more numeric characters (e.g.19.69). The transmitting resolution shall be within the range 19.30 ppmm (490 ppi) to 20.08ppmm (510 ppi) for a Type-4 record . This range reflects the 2% tolerance from 500 ppiallowed for PIV certified devices. (See Table 14). For example, a sensor that scans nativelyat 508 ppi would list both NSR and NTR as 20 ppmm ( = 508 ppi). These images shouldnot be sampled down to exactly 500 ppi. This field is set to “00.00” if no Type-4 records arepresent in the transaction. Given that the transmitting resolution shall not be greater than the80