ANSI INCITS 379-2004 pdf download Information Technology – Iris Image Interchange Format
1 Scope This Standard specifies two alternative image interchange formats for biometric authentication systems that utilize iris recognition. The first is based on a rectilinear image storage format that may be a raw, uncompressed array of intensity values or a compressed format such as that specified by the JPEG standard. Images may be monochrome or color with 256 or more intensity levels (grey or per-color), and vary in size depending on field of view and compression. Typical size is 25 –30 Kbytes for JPEG format. The second format is based on a polar image specification that requires certain pre-processing and image segmentation steps, but produces a much more compact data structure that contains only iris information. The record size can be as small as 2 Kbytes. The polar image may be either raw or compressed format. Data that comply with either one of the iris image formats specified in this standard are intended to be embedded in a CBEFF-compliant structure in the CBEFF Biometric Data Block (BDB).
2 Conformance Conformity with the standard requires compliance with one of the data formats described in Section 5. Recommended image quality criteria described in Annex A are expressed in terms of resolution, contrast, noise level, etc. Because iris recognition applications may have varying image quality requirements, three different levels of image quality are defined in Annex A. In general, the highest image quality level is recommended for high-volume, high-security applications where the lowest possible recognition error rates are required. Lower levels of image quality are appropriate for less demanding applications in which higher error rates can be tolerated but camera cost is a critical factor. This standard is intended for technical review of the proposed image standard.
3 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this American National Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.