1. INTRODUCTION
Attention and saliency play important roles in visual perception. Consequently, a number of saliency-based quality assessment algorithms have been proposed in recent years, see e.g. [16],[30]. While comparisons and reviews of saliency models are quite common [4], [21], information on eye tracking databases is harder to come by. There are over two dozen databases with eye tracking data for both images and video in the public domain. We review the content and purpose of each database and discuss their commonalities and differences.