INB Lunch-Seminar

Eye movements on natural videos: low-level feature

correlations at successive fixations

Dipl.-Inf. Michael Dorr

We investigated the relationship between low-level image features at successive fixations during free-viewing of natural dynamic scenes.

Colour, local orientation, and motion were computed on a Gaussian multiresolution pyramid (6 spatial, 3 temporal levels). We also computed geometrical invariants that have been used to predict eye movements before.

We then examined the distributions of differences between features at successive fixations, i.e. their temporal correlations along the scanpath. We compared the recorded scanpaths with randomly generated scanpaths with varying degree of similarity to natural scanpaths (saccade length, direction, etc.).

In most conditions, we found statistically significant differences in the distributions. However, we found that these feature correlations along the scanpath are mainly due to spatio-temporal correlations in natural scenes and a bias in target selection (e.g., moving objects are fixated more often).

Therefore, we conclude that low-level features at the current centre of fixation contribute little to the selection of the next saccade target.

Zeit: Freitag, den 22. Juni 2007, 12 Uhr c.t.

Ort: Institut für Neuro- und Bioinformatik
        Seminarraum (1. OG, Raum 17),
        Ratzeburger Allee 160 (Geb. 64, 1. OG)