What is the stroboscopic effect?
The stroboscopic effect is the phenomenon of human visual perception, which shows that movement is interpreted by the brain that receives discreet images and stitches them together with automatic aliases for time continuity. In short, movement is an artifact. Whether with a flashing light source or opening and closing the aperture, Strobos can control what the eye sees a moving object. Although it actually moves, if each image of the retina of the object is in the same precise position, it will be perceived as stationary. Stroboscopic control of recurring or predictive movement, such as wheel rotation, can create an optical illusion that is completely contrary to real movement.
The first stroboscope was a novelty in which a fighter with consecutive images of something in motion, such as walking Koněv in the opposite direction, was shaken by a number of radial observation slots and created the illusion of moving images.The film uses the same principle with a projector light and a lens, which contains a high -speed shutter that alternately illuminates and closes a long, spinning reel of a setting static paintings. Stroboscopic effect can also create a rotary or oscillating mirrors. Electronic strobe lights, for the first time invented in 1931, are bulbs containing gases that are discharged at the speed of a modified frequency or cycling alternately its polarity. Fluorescent lighting is actually a West that flashes and turns off at speed too quickly to recognize people.
Scientists have long since found that people perceive indistinguishable the real movement in 24 frames per second - the rate that is larger does not provide any improvement in verisimilitude, and the smaller rate causes recognizable illusion of movement. A number of theories have evolved from this observation. One of them is the theory of a discrete framework that assumes that this speed correlates with the physical speed of nerve impulses and that each signal represents a static image of the retina. The human brain then subjectively produces the movement by processing subsequent images with time aliasing, filling the empty moments of ghost images according to hard laws and learned rules of space and time.
This theoretical frame is the most respected explanation of the stroboscopic effect. People do not see physical movement; Rather, the brain interprets movement on the basis of fast, but episodic, yet about retina information. The effect is most clearly demonstrated by recurring - including cyclically moving - objects. APT analogy is that if you take pictures of working hours every 60 seconds, one can just conclude that the other hand is broken and moved. Any such object whose movement is perfectly synchronized to stroboscopically seems immobile.
extrapolation from this visual phenomenon if a video camera that works on 24 frames per second, shoots a car wheel thatrotates 23 times per second or its fractional equivalent, each consecutive video frame captures the bike in a position just lagging behind the full revolution of their previous image. The evidence of the image in the image clearly suggests that the wheel has moved backwards, and in fact the human vision perceives them to spin in the opposite revolution per second. The optical illusion, which is familiar with films showing prams drawn by horses, is called the "effect of the wheel of the wheel" and occurs differently with any video recording of the rotating object.
Stroboscopic effect can be indicated elsewhere. Popularized dance clubs, light that relatively slowly throws a dance movement in a seemingly slow motion. A racing car engine that rotates to 9,000 revolutions per minute with stroid light to freeze and analyze the static condition of the engine at this speed. A water fountain with a known flow can be displayed that obviously defies gravity by illuminating it temporarily compensationAryic stroch. The principles derived from the stroboscopic effect such as sampling frequency and algorithms of aliasing from one sample to another were used on optical devices such as pulsating lasers that read the spinning digital data disk