Object and scene analysis by saccadic eye-movements: an investigation with higher-order statistics

Spat Vis. 2000;13(2-3):201-14. doi: 10.1163/156856800741216.

Abstract

Based on an information theoretical approach, we investigate feature selection processes in saccadic object and scene analysis. Saccadic eye movements of human observers are recorded for a variety of natural and artificial test images. These experimental data are used for a statistical evaluation of the fixated image regions. Analysis of second-order statistics indicates that regions with higher spatial variance have a higher probability to be fixated, but no significant differences beyond these variance effects could be found at the level of power spectra. By contrast, an investigation with higher-order statistics, as reflected in the bispectral density, yielded clear structural differences between the image regions selected by saccadic eye movements as opposed to regions selected by a random process. These results indicate that nonredundant, intrinsically two-dimensional image features like curved lines and edges, occlusions, isolated spots, etc. play an important role in the saccadic selection process which must be integrated with top-down knowledge to fully predict object and scene analysis by human observers.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Computer Simulation
  • Data Interpretation, Statistical*
  • Fixation, Ocular / physiology
  • Humans
  • Image Processing, Computer-Assisted
  • Motion Perception / physiology*
  • Pattern Recognition, Visual / physiology*
  • Reference Values
  • Saccades / physiology*
  • Video Recording