ANSI/NIST-ITL 2-2008 - National Institute of Standards and ...

Part 2 ANSI/NIST-ITL 2-2008
associated with the subject of the transaction. Data contained in this record shall conform in
format and content to the specifications of the domain name as listed in Domain Name element
found in the Type-1 record.
208.1.3 Type-3 through Type-6 fingerprint image records
The XML names for the Type-3 through Type-6 records are
,
,
,and
, respectively.
Their elements shall have a values of “03”, “04”, “05”,
and “06” respectively. Logical record types 3-6 are used to exchange fingerprint image records
originally scanned at the minimum scanning resolution of 19.69 ppmm plus or minus 0.20 ppmm
(500 ppi plus or minus 5 ppi) and transmitted at the nominal pixel density of 19.69 or 9.84 ppmm.
The four record types differ according to the pixel density of the transmitted image and the type of
data exchanged. Table 206 summarizes the differences between the four record types. (Table
206 is the same as Table 6 in Part 1 except the errors have been corrected for Type-3 and Type-
5 maximum pixel density values.)
The fingerprint image data contained in any of the logical records may be in compressed form.
The Wavelet Scalar Quantization (WSQ) algorithm has been generally used to compress
grayscale images while the facsimile algorithm is used for the binary images. Typically, there
may be up to 14 records of any of these logical types of fingerprint images in a file; ten rolled
impressions of the individual fingers, two plain impressions of the thumbs, and two
simultaneously obtained plain impressions of the four remaining fingers on each hand.
When the image data is obtained from a live-scan reader, it shall be the grayscale or binary
output (or subsampled, scaled down, or interpolated output) of the live-scan fingerprint scanner
and not a rescan of a hard copy fingerprint image.
Table 206 Resolution of Transmitted fingerprint image records
Record type Data type
Preferred
Pixel Density
19
Maximum
Pixel Density
Ppmm ppi ppmm ppi
Type-3 Grayscale 9.84 250.00 10.34 262.50
Type-4 Grayscale 19.69 500.00 20.67 525.00
Type-5 Binary 9.84 250.00 10.34 262.50
Type-6 Binary 19.69 500.00 20.67 525.00