Bayesian Color Constancy with Non-Gaussian Models

Charles Rosenberg, Thomas Minka, Alok Ladsariya, "Bayesian Color Constancy with Non-Gaussian Models", poster appeared at NIPS 2003.

Abstract, Paper (119K), ps.gz (95K).

More general information about color constancy can be found here.

Distribution Plots:

Plots of slices of the three dimensional (32x32x32) color surface reflectance distribution along a single dimension:

• Row one plots green versus blue and slices in red whose magnitude increases from left to right.
• Row two plots red versus blue with slices in green whose magnitude increases from left to right.
• Row three plots red versus green with slices in blue whose magnitude increases from left to right.

Plots are scaled by a factor of 2 in each dimension to make the structure more visible.

Selected Result Images:

monkey-1

books-2

hdr_mondrian

paper2

blocks1

fruit-1

Click here for results for the full test set.

Notes:

• the results presented here are meant for a qualitative visual comparison, please see the paper for quantitative results.
• the resulted presented here are for the "hull" restricted illuminant search
• the images here were preprocessed as follows to facilitate visual comparison:
  1. image data corrected using the diagonal model
  2. image size scaled down by a factor of 3 in each dimension using averaging (for data size)
  3. image data brightness normalized by scaling all channels so mean over all channels is 32
  4. gamma curve applied of 2.0
• missing images (broken links) were removed by the original data set preparers because of collection problems
• the data set was prepared by K. Barnard, L. Martin, B. Funt. and A. Coath and is available here

Training Images:

Following are some examples of the 2349 images used to train the cannonical color distribution.

A text file containing a list of the image file names can be found here.

The complete image set can be downloaded from this link as a 25MB tar file.

Please note that these images are provided for research purposes only. You will need to contact the copyright owners for publication / use rights.