# The Koffka Ring

Here I apply the color constancy algorithm I am working on to a
chromatic version of the "Koffka ring" image.
The regularization filter used was h128f5 (a 128 tap filter for Hurlbert
regularization using parameters:

- Gamma = 0.1
- Beta = 10
- Sigma = 20
- Lambda = 10

and 600 passes of the relaxation algorithms were performed.
The Luminance components and the
detected edges in the luminance channel are
also used in the computations.

Other koffka test images processed using the same algorithm and parameters:

## Spatially Varying and Noisy Illuminant

These are the results of processing Koffka images generated with a
simulated spatially varying and noisy illuminant.

The original image:

After lightness calculation:

After relaxation:

The original image:

After lightness calculation:

After relaxation:

wad@media.mit.edu 12/96