Departamento de Informaica da Universidade da Beira Interior


















Registered Users









SOCIA Lab.: Soft Computing and Image Analysis Group 

Department of Computer Science, University of Beira Interior, 6201-001 Covilha, Portugal
Contador de Visitas 





In 2004 we released the UBIRIS.v1 database. Our purpose was to simulate less constrained imaging processes and acquire visible wavelength images with several types of data occluding the iris rings (considered noise). A large number of experiments were conducted on this database and reported in the literature, although the realism of its noise factors received some criticisms. This was a major motivation for the development of a new version of the database (UBIRIS.v2) in which the images were actually captured on non-constrained conditions (at-a-distance, on-the-move and on the visible wavelength), with corresponding more realistic noise factors.


Fig1. Overview of the used image acquisition framework (A,B), light sources (C,D) and subjects location (E).


The major purpose of the UBIRIS.v2 database is to constitute a new tool to evaluate the feasibility of visible wavelength iris recognition under far from ideal imaging conditions. In this scope, the various types of non-ideal images, imaging distances, subject perspectives and lighting conditions existent on this database could be of strong utility in the specification of the visible wavelength iris recognition feasibility and constraints.


Image Acquisition Framework and Set-Up

Camera = Canon EOS 5D

Color Representation = sRGB

Shutter Speed = 1/197 sec.

Lens Aperture = F/6.4 - F/7

Focal Length = 400 mm

F-Number = F/6.3 - F/7.1

Exposure Time = 1/200 sec.

ISO Speed = ISO-1600

Metering Mode = Pattern


Details of the Manually Cropped Resultant Images

Width = 400 pixels

Height = 300 pixels

Format = tiff

Horizontal Resolution = 72 dpi

Vertical Resolution = 72 dpi

Bit Depth = 24 bit


Totals = Subjects 261; Irises 522; Images 11 102

Gender = Male: 54.4%; Female: 45.6%

Age = [0,20]: 6.6% [21,25]: 32.9% [26,30]: 23.8% [31,35]: 21.0% [36,99]: 15.7%

Iris Pigmentation = Light : 18.3% Medium : 42.6% Heavy : 39.1%


The setup of the imaging framework is given in the above table. As illustrated in figure 1, this framework was installed on a lounge under both natural and artificial lighting sources. We placed several marks on the floor (between three and ten meters away from the acquisition device) and asked for volunteers for the image acquisition processes. Two distinct image acquisition sessions were performed, each one during two weeks and separated by an interval of one week. From the first to the second session the location and orientation of the acquisition device and artificial light sources was changed, in order to increase heterogeneity. Volunteers were at large majority latin caucasian (around 90%) and also black (8%) and asian people (2%). Around 60% of the volunteers performed both imaging sessions, while 40% performed exclusively one, either during the first or second acquisition period.

Subjects were required to walk at a slightly slower than normal speed and to look at several lateral marks that obliged them to rotate head and eyes, enabling the manual capturing of 3 images per meter, between eight and four meters, giving a total of 15 images per eye and session, for the large majority of the individuals. It should be stressed that this requested cooperative behavior had the unique purpose of normalizing the number of usable images per subject and imaging session. A completely covert procedure could have been used with a necessarily lower number of usable images per session. As it is illustrated in figure 2, the significantly higher range of distances between the subjects and the imaging framework is one of the major distinguishable points between the UBIRIS.v2 database and the remaining ones.


Download Application Form: [pdf]


All requests for the UBIRIS.v2 database must be directed (by email) to the following address: Applicants should manually fill, sign, scan and attach the application form to the given email address. Upon receipt of an executed copy of the signed application form, access instructions will be given.


Download Password Protected ZIP Files: [zip1] [zip2] [readme]




All documents and papers that report on research that uses the UBIRIS.v2 database must database by including an appropriate citation:


"Hugo Proença, Sílvio Filipe, Ricardo Santos, João Oliveira, Luís A. Alexandre; The UBIRIS.v2: A Database of Visible Wavelength Iris Images Captured On-The-Move and At-A-Distance, IEEE Transactions on Pattern Analysis and Machine Intelligence, August, 2010, volume 32, number 8, pag. 1529-1535, ISSN: 0162-8828, Digital Object Identifier".



,author = "Proenca, H. and Filipe, S. and Santos, R. and Oliveira, J. and


,title = "The {UBIRIS.v2}: A Database of Visible Wavelength Images Captured On-The-Move and At-A-Distance"

,journal = "IEEE Trans. PAMI"

,volume = "32"

,doi = {10.1109/TPAMI.2009.66}

,number = "8"

,pages = "1529-1535"

,month = "August"

,year = "2010"




Publications to SOCIA Lab.:


A copy of all reports and papers that use the UBIRIS.v2 database and are for public or general release must be forwarded immediately upon release or publication to the SOCIA Lab. email address:














DI-UBI Bloco VI Rua Marques de Avila e Bolama P- 6201-001 Covilha, PORTUGAL