The Importance of Velocity Gradients in the Perception of Three-Dimensional Rigidity
- 1 February 1990
- journal article
- Published by SAGE Publications in Perception
- Vol. 19 (1) , 21-27
- https://doi.org/10.1068/p190021
Abstract
Sequential presentation of a number of random-dot patterns which when superimposed yield an expanding flow field leads to the perception of a coherent motion towards the observer. The motion vectors in this type of flow field all radiate from the origin. This percept of a global coherent expanding flow results only when the local speeds (magnitude of the local motion vectors) are zero at the centre and increase linearly towards the periphery. If all the dots radiate outwards but have the same speed, a clear percept of three-dimensional nonrigidity arises.Keywords
This publication has 19 references indexed in Scilit:
- The role of direction information in the perception of geometric optic flow componentsPerception & Psychophysics, 1990
- A parallel algorithm for real-time computation of optical flowNature, 1989
- Perception of translational heading from optical flow.Journal of Experimental Psychology: Human Perception and Performance, 1988
- Visual processing of four kinds of relative motionVision Research, 1986
- Maximizing Rigidity: The Incremental Recovery of 3-D Structure from Rigid and Nonrigid MotionPerception, 1984
- On the information in optical flowsComputer Vision, Graphics, and Image Processing, 1983
- How Do We Avoid Confounding the Direction We Are Looking and the Direction We Are Moving?Science, 1982
- The interpretation of a moving retinal imageProceedings of the Royal Society of London. B. Biological Sciences, 1980
- Visually Guided Locomotion: Psychophysical Evidence for a Neural Mechanism Sensitive to Flow PatternsScience, 1979
- Local structure of movement parallax of the planeJournal of the Optical Society of America, 1976