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.. _olivetti_faces:
The Olivetti faces dataset
==========================
This dataset contains a set of face images taken between April 1992 and April
1994 at AT&T Laboratories Cambridge. The website describing the original
dataset is now defunct, but archived copies can be accessed through
`the Internet Archive's Wayback Machine`_.
.. _the Internet Archive's Wayback Machine: http://wayback.archive.org/web/*/http://www.uk.research.att.com/facedatabase.html
As described on the original website:
There are ten different images of each of 40 distinct subjects. For some
subjects, the images were taken at different times, varying the lighting,
facial expressions (open / closed eyes, smiling / not smiling) and facial
details (glasses / no glasses). All the images were taken against a dark
homogeneous background with the subjects in an upright, frontal position (with
tolerance for some side movement).
The image is quantized to 256 grey levels and stored as unsigned 8-bit integers;
the loader will convert these to floating point values on the interval [0, 1],
which are easier to work with for many algorithms.
The "target" for this database is an integer from 0 to 39 indicating the
identity of the person pictured; however, with only 10 examples per class, this
relatively small dataset is more interesting from an unsupervised or
semi-supervised perspective.
The original dataset consisted of 92 x 112, while the version available here
consists of 64x64 images.
When using these images, please give credit to AT&T Laboratories Cambridge.
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