Gibson describes the displacement of structure in the optic array as a transformation that becomes “alive with motion when the observer moves”. Helmholtz is mainly concerned about depth perception and he describes optic flow as the “variations of the retinal image” that are due to body motion and depend on the structure, namely distance as well as rigidness, of the environment. Horn’s: “The apparent motion of brightness patterns observed when a camera is moving relative to the objects being imaged is called optical flow.” (Horn, 1986, p. Introspectively, the field is everywhere alive with motion when the observer moves.” (Gibson, 1966, p. Gibson’s: “Analytically, this total transformation of the array appears to mean that the elements of this texture are displaced, the elements being considered as spots. Helmholtz’s: “My belief too is that it is mainly by variations of the retinal image due to bodily movements that one-eyed persons are able to form correct apperceptions of the material shapes of their surroundings.” (Helmholtz, 1925, p. Further definitions from the literature highlight different properties of optic flow. on the retina or the camera’s sensor, due to a relative motion between the eyeball or camera and the scene. Optic flow is defined as the change of structured light in the image, e.g. 12.15 A15 Log-monopole mapping of optic flow.12.13 A13 Methods which uses a probabilistic framework.12.12 A12 Method of normal flow estimation.12.7 A7 Method of Horn & Schunck (1981).12.6 A6 Method of Fleet & Jepson (1990).12.5 A5 Method of Shizawa & Mase (1991).12.1 A1 Method of Lucas & Kanade (1981).
9 Optic flow in psychophysics – Perception and phenomenology.8.2 Cortex models of spatial and temporal motion integration.8.1 Initial optic flow detection and processing.8 Biologically inspired models for optic flow processing.7.2 Functional magnetic resonance imaging (fMRI).6 Optic flow for guidance of locomotion and scene parsing.5.2 Regularization approaches for the estimation of optic flow.5.1 Constraints for the estimation of optic flow.
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