A complete tech report on the Caltech-256 Image Set (and how to use it for benchmarking) will be posted here soon.

For now, here is a brief comparison of Caltech-101 and Caltech-256:

This hand-drawn taxonomy gives a rough idea how the categories are organized. The 29 green categories contain some images that overlap with Caltech-101. The red categories are potentially related to another category (even though their images sets are completely independent).

Greg Griffin
Last modified: Wed Sep 27 00:15:35 PDT 2006