| Added | Fri, 07/10/2016 |
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The occurrence of visual illusions of immobility or apparent movement of the object when it is intermittent (periodically) visual observation. It can manifest itself in the coverage of moving or rotating objects pulsating luminous flux, when performing any work when there is a relative displacement between the eye and the illuminated object, or when shooting video. The appearance of this effect in the video is due to the fact that it is not continuously and with a frequency of about 30 frames per second.
For example, a fluorescent lamp (linear tubular lamp - approx. ed.) in AC power 100 times per second led turns on and off, since the 50 Hz current 100 times per second, changing direction, passing through zero. The extinction of the lamp are not visible, however, they adversely affect the vision and, moreover, can distort the true picture of the movement of illuminated objects. This phenomenon is called the stroboscopic effect.
To eliminate periodic fading of a fluorescent lamp fundamentally impossible: it is her nature.
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The frequency of the flapping birds coincides with frequency of frames per second on the camera
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The frequency of the movements of the blades of the helicopter coincides with frequency of frames per second on the camera
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For this illusion, probably used a strobe with a change in the blinking frequency using a smartphone.
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