The Iris Exchange (IREX) was initiated at NIST in support of an expanded marketplace of iris-based applications based on standardized interoperable iris imagery. The work is primarily conducted in support of the ISO/IEC 19794-6 standard. It secondarily supports the ANSI/NIST ITL 1-2007 Type 17 standard, as derived from the ISO/IEC 19794-6:2005 parent.
As of late 2009, three activities have been completed or are underway. The first, IREX I, addressed standards, formats and compression for data interchange. The second, IREX II, is intended to define and measure image quality. The third, IREX III, will give guidelines to users.
IREX IV continues along the path of IREX III as an evaluation of one-to-many iris recognition for large-scale applications. IREX IV was initiated to serve two purposes: 1) to explore the potential for using cost functions for application-specific algorithm optimization; and 2) to support the ISO/IEC 19794-6 standard by defining a compression profile for the compact representation of iris images.
NIST concluded the IREX III evaluation of one-to-many iris algorithms in April 2012. IREX III was the first independent and public test of iris identification search technologies. It used millions of images to validate results published in the academic literature that iris is a very powerful biometric. The final report and a chronology of the test are given on the IREX III home page: http://www.nist.gov/itl/iad/ig/irexiii.cfm .
IREXII IQCE aims to evaluate the effectiveness of image quality assessment algorithms (IQAAs) that produce a scalar overall image quality in predicting the recognition accuracy of particular comparison algorithms (from the supplier of the IQAA), and of other algorithms. Furthermore, per the IREX I result that quality scores are not immediately interoperable, IQCE will establish a score calibration procedure for IQAAs.
IREX I was being conducted to address two issues: First is how far compression can be pushed before the accuracy of leading commercial matching algorithms begins to degrade. Second, the accuracy of iris images in compact polar form when it is prepared by one supplier and verified later by another. The program supports identity management applications where compact size and interoperability are of primary concern. These include federated identity credential or network-based applications.
IREX III final Report (zip File) is now available