Figure 1. Optic flow field and decomposition into self-motion and object-motion components.
(A) Optic flow field generated by an observer moving over a ground surface and an object (yellow dot) moving from right to left. (B) The component of optic flow due to self-motion independent of object motion. (C) The component of optic flow due to object motion independent of self-motion. The optic flow field (A) is the vector sum of the self-motion (B) and object-motion (C) components.
