ISO/IEC 39794-4-2019 pdf free.Information technology — Extensiblebiometric data interchange formats.
1.Scope:This document specifies:generic extensible data interchange formats for the representation of friction ridge image data: atagged binary data format based on an extensible specification in ASN.1 and a textual data formatbased on an XML schema definition that are both capable of holding the same information;examples of data record contents;application specific requirements, recommendations, and best practices in data acquisition; and- conformance test assertions and conformance test procedures applicable to this document.
2.Normative references:The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.ISO/IEC 2382-37, Information technology —Vocabulary — Part 37:Biometrics
ISO/IEC 8824-1, Information technology – Abstract Syntax Notation One (ASN.1): Specification of basicnotation — Part 1
ISO/IEC 8825-1, Information technology —ASN.1 encoding rules —Part 1: Specification of Basic EncodingRules (BER), Canonical Encoding Rules (CER), and Distinguished Encoding Rules (DER)
ISO/IEC 14495-1, Information technology —Lossless and near-lossless compression of continuous-tone stillimages: Baseline
ISO/IEC 15444 (all parts), Information technology—JPEG 2000 image coding system.
ISO/IEC 15948, Information technology —Computer graphics and image processing — Portable NetworkGraphics (PNG): Functional specification.
3.Terms and definitions:For the purposes of this document, the terms and definitions given in ISO/IEC2382-37,ISO/IEC39794-1and the following apply.
This document is designed to accommodate both plain (flat) or rolled fingerprint images. Biometricsystems perform better if the volar pad of the finger is centred both horizontally and vertically in theimage capture area. Therefore, when capturing a fingerprint image, the centre of the fingerprint imageshould be located in the approximate centre of the image capture area.
For multiple finger verification and/or identification purposes, there exist fingerprint capture devicesthat will acquire images of multiple fingers during a single capture cycle. These devices are capable ofcapturing the plain impressions from two, three or four adjacent fingers of either hand during a singlescanning.The plain impressions from the two thumbs or two index fingers can also be captured at onetime.Therefore, with three placements of the fingers on a device’s scanning surface all ten fingers froman individual would be acquired in three scans -right four fingers left four fingers, and two thumbs.For these multi-finger captures, half of the captured fingers should be located to the left of the imagecentre and the other half of the fingers to the right of the image centre.ISO/IEC 39794 pdf download.