"Brodatz" Test Suite

This test suite uses images from the Brodatz textures. The Brodatz textues are taken from the album "Textures: a Photographic Album for Artists and Designers" by Phil Brodatz (Dover Publications, NY 1966)

There are 16 different textures corresponding to Brodatz plates D4, D9, D15, D17, D20, D24, D29, D34, D52, D54, D57, D84, D92, D103, D110, D111. Each texture is originally a 256x256 pixel image, which has been broken into 64 32x32 images. The numbering starts at the top left, and works from left to right, then top to bottom. Thus D4.0000.pgm, D4.0001.pgm, ..., D4.0015.pgm form the top row of the first original texture.

Texture D15r is derived from the images of Texture D15 by a 90 degree rotation.

Tests 01 to 05 compare two textures each, with increasing difficulty. Test 06 compares texture D15 (which is strongly directional) with its 90 degree rotation. Test 07 repeats the most difficult pairwise test, test05, with differing priors: D29 has prior probability 0.1 and D4 has prior probability 0.9. Tests 08, 09 and 10 compare three textures each. Tests 11 and 12 compare four textures. Test 13 compares 8 textures and test14 compares all 16 textures.