# Fast Fourier Color Constancy and Grayness Index for ISPA Illumination Estimation Challenge

## TL;DR

This paper presents two methods for illumination estimation in images, one based on Fourier transform and the other on Grayness Index, achieving competitive rankings in a challenge.

## Contribution

It introduces two novel approaches for illumination estimation, demonstrating their effectiveness in a competitive challenge setting.

## Key findings

- Fourier-transform-based method ranked 3rd
- Grayness Index-based method ranked 6th
- Both methods show promising results in illumination estimation

## Abstract

We briefly introduce two submissions to the Illumination Estimation Challenge, in the Int'l Workshop on Color Vision, affiliated to the 11th Int'l Symposium on Image and Signal Processing and Analysis. The Fourier-transform-based submission is ranked 3rd, and the statistical Gray-pixel-based one ranked 6th.