Page 180 - Automated Fingerprint Identification Systems (AFIS)

STANDARDS AND INTEROPERABILITY 165

13. Type 13: variable-resolution latent image record. The type 13 tagged-field
image record contains and can be used to exchange variable-resolution latent
fingerprint and palm print image records along with fixed and user-defined
textual information fields related to the digitized image. The scanning resolu-
tion must be a minimum of 19.69pp/mm (500ppi). However, the standard
further states, “It is strongly recommended that the minimum scanning reso-
lution (or effective scanning resolution) and transmission rate for latent images
be 39.38pp/mm plus or minus 0.40pp/mm (1,000ppi plus or minus 10ppi).”
Also, the latent image data shall be uncompressed or the output from a loss-
less compression algorithm. There is no limit on the number of latent records
in a transaction.
14. Type 14: variable-resolution tenprint image record. The type 14 tagged-
field image record contains and can be used to exchange variable-resolution
tenprint fingerprint image records along with fixed and user-defined textual
information fields related to the digitized image. The fingerprint images can
be either rolled or plain impressions. The scanning resolution must be a
minimum of 19.69pp/mm (500ppi). However, the standard further states, “It
is strongly recommended that the minimum scanning resolution (or effective
scanning resolution) and transmission rate for latent images be 39.38pp/mm
plus or minus 0.40pp/mm (1,000ppi plus or minus 10ppi).” Also, the tenprint
image data may be compressed. There are typically 14 of these variable-resolu-
tion records in a file: the ten rolled impressions, the two thumb plain impres-
sions, and the plain impressions of each of the remaining sets of four fingers
on each hand.
15. Type 15: variable-resolution palm print image record. The type 15
tagged-field image record contains and can be used to exchange variable-
resolution palm print image records along with fixed and user-defined textual
information fields related to the digitized image. The scanning resolution is
not specified. Images scanned at 19.69pp/mm (500ppi) may be exchanged as
a type 15 record. However, the standard further states, “It is strongly recom-
mended that the minimum scanning resolution (or effective scanning resolu-
tion) and transmission rate for palm print images be 39.38pp/mm plus or
minus 0.40pp/mm (1,000ppi plus or minus 10ppi).” Also, the palm print
image data may be compressed. There may be six of these records in a file: two
full palm prints or four partial palms, and two writer’s palm, which is the area
on the side of the palm that normally rests against the paper when writing.
16. Type 16: user-defined testing image record. The type 16 record is for
developmental purposes and the exchange of miscellaneous images. It is a
tagged-field version of the type 7 user-defined logical record, and is intended
for an image not specified or described elsewhere in the standard. The scan-
ning resolution is not specified.