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Introduction Koenderink and van Doorn (1975) showed that optic flow over a small area of the visual field can be decomposed into two translational components, and four first-order elementary flow components (EFCs) shown in figure 1. The EFCs are circular motion or rot (rotation), radial motion or div (divergence), and two components of shearing motion def and def6 (deformation). Together, rot and div are called the conformal components of flow; def and def6 are the deformation components. Adoi:10.1068/p2807 pmid:10627850 fatcat:lr3dedeh25ak5ji5rxsxwobbxu