Persistence of Vision Explained: How Movie Cameras Trick Our Brains

[DeathKnight]

I know it is used to refer to the property of brain/eye that it takes them one-tenth of a second to process a new image after processing one but I just can't figure out how does a movie camera takes advantage of it and fool our brain so that it thinks that its waching a smooth motion though i know that most of them change 24 images a second. I've tried google but coundnt find anything convincing.
Thanks in advance for any help.
Abdullah

 

[Integral]

A film projector flashes images at about 30 frames per sec. So each frame is on the screen for a period of time which is less then the persistence of the eye. Before 1 frame has faded a new one is present. Thus you get the feeling of smooth motion.

 

[rcgldr]

change 24 images a second.

This only works well under dark light, with your pupils dialated and your retina getting just enough over-saturation that the persistance increases.

Under bright light, you can see 60hz flicker on a monitor, but part of this is that the persitance of the monitor is set for faster refresh rates.

 

[physicsisphirst]

here is a neat page with a simple explanation and demonstrative animations:
http://www.privatelessons.net/2d/sample/m01_03.html

however, it seems that the persistence of vision 'theory' may not be correct at all according to research done in the 1980s and that it is really a psychological phenomenon. here is a rather interesting (and surprising - to me at any rate) article on that matter:

it has in fact long been determined that the so-called 'persistence of vision' is also probably irrelevant to the effect of (1), a continuous, flickerless image.
PERSISTENCE OF VISION by Stephen Herbert
http://www.grand-illusions.com/percept.htm

it would seem that the commonly propagated explanation of illusion, may itself be an illusion!

 

[rayjohn01]

Given that the brain takes at least 50mS to process data and somtimes never it's hardly surprising that persistence should be more complex than retina saturation , it is often the case that what you remember is totally different from reallity --- so I guess you can say that everbodies movie is probably different antway.
Ray.