And then increase the speed and then change back, so repeated.
First of all, the name of this phenomenon is called Wagon Wheel Illusion, is the objective existence - yes, even in the sun, no light strobe, with a real wheel continuous rotation, will make people illusion.
The copyright belongs to the author. For business reprint please contact the author to obtain authorization, non-commercial reprint please indicate the source. Therefore, the conditions that constitute the framing are necessary prerequisites for this phenomenon. @ Xu Zhou's other part of the answer there is a more obvious mistake, that is, only one turn every frame to produce the effect of the wheel stationary, if so count, the film 24 frames per second, a car if the wheel Go to 24 laps per second, I estimate the speed is about 170km / h. In fact, in the movie to make the wheel seemingly still, there is no need to achieve such a high speed: the wheel is centrosymmetric, so if a wheel has 12 spokes, as long as the rotation 1/12 laps, the image And the original image can be completely coincide, that is, as long as the rotation of each frame 1/12 laps, which is two laps per second, you can get the effect of the wheel still.
The human eye on the image processing is no frame, if the human eye is also sub-frame, then the film is completely no possibility: a sub-frame camera equipment in the shooting of a sub-frame display device, if the frame rate is different , There will be extremely obvious image flicker phenomenon, we go to the Internet to find some news interviews in the camera when the camera to monitor the scene to know the computer (because the CRT is progressive scan, so the screen in addition to shooting in addition to scrolling , The film can avoid the phenomenon of rolling, but the flash or can not avoid), if the human eye to deal with the image really sub-frame, then the film in the eyes of people will be the case, the film can not read. Even if the frame rate of the display and the shooting device frame rate is exactly the same, the image in order to do the normal display is also difficult, because you can not avoid every time you shoot the time just hit the display device is switching frame such a situation Kind of situation you will be photographed the content of the whole black.
Another explanation suggests that although the time resolution of the eye is high, the consciousness is that it is taken from the eye every other time. The mysterious point - the shutter is not in your eyes, but in the heart
