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Billboards and other electronic signs use apparent motion to simulate moving text by flashing lights on and off as if the text is moving.. The term illusory motion, or motion illusion or apparent motion, refers to any optical illusion in which a static image appears to be moving due to the cognitive effects of interacting color contrasts, object shapes, and position. [1]
The Ternus illusion (1926/1938) is based upon apparent motion. Thaumatrope: A thaumatrope is a toy that was popular in Victorian times. Trompe-l'œil: Troxler's fading: Troxler's fading: When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear ...
The term phi phenomenon is used in a narrow sense for an apparent motion that is observed if two nearby optical stimuli are presented in alternation with a relatively high frequency. In contrast to beta movement , seen at lower frequencies, the stimuli themselves do not appear to move.
Illusory motion, the appearance of movement in a static image; Phi phenomenon, an illusion of movement created when two or more adjacent lights blink on and off in succession; Stroboscopic effect, a phenomenon that occurs when continuous motion is represented by a series of short or instantaneous samples
Instead, apparent motion appears to arise from the visual system's processing of the physical properties of the percept. It is for this reason that apparent motion is a key area of research in the domain of vision research. [5] The Ternus illusion is perhaps one of the best examples of such an effect.
Optical flow or optic flow is the pattern of apparent motion of objects, surfaces, and edges in a visual scene caused by the relative motion between an observer and a scene. [1] [2] Optical flow can also be defined as the distribution of apparent velocities of movement of brightness pattern in an image. [3]
Example of the beta movement effect. The term beta movement is used for the optical illusion of apparent motion in which the very short projection of one figure and a subsequent very short projection of a more or less similar figure in a different location are experienced as one figure moving.
The apparent motion of stars near the celestial pole seems slower than that of stars closer to the celestial equator. Conversely, following the diurnal motion with the camera to eliminate its arcing effect on a long exposure , can best be done with an equatorial mount , which requires adjusting the right ascension only; a telescope may have a ...