| TWRoO said: it's 24Hz to be able to match with your eyes own resolution, i thought eyes only "took a picture" 24 times a second so there is no need to have more, more than 24Hz just means there are frames you don't even get to see. and if that is true about repeating every 4th frame for 30Hz then that is just silly, i mean that would actually make a jitter as much as having less than 20Hz. i could be wrong about 24Hz because i vaguely remember it being only 20 pictures per second for the eyes. ---- kind of off-topic: i remember seeing/reading something about pigeons eyes taking about twice as many pictures per second as human eyes (i assume it's the same for most animals that are considered to have better eyesight than humans) so watching a cinema screen to them is like us watchinga slide show. |
Your eyes do not take snapshots at all; the rods and cones in your eyes receive light and react to it in a fluid, non-discrete manner.
The required framerate for a video to look 'smooth' varies depending on the picture source. 24 fps is good enough for movies because the video camera does not take discrete, instantaneous images; rather, it captures the light that comes through the lens during 1/24 of a second, so the individual frames are a bit blurry where things are in motion. This blurriness is what allows your brain to interpret the video as smooth motion.
If you played a computer game at 24 fps, you would easily be able to see jittering, because the images generated by your computer are not blurred, they are discrete. Most people can tell a difference up to 60 fps. Some claim to be able to tell a difference above 60 fps, but this is usually only important if there is very fast motion on the screen. The faster something is moving, the greater the change between one frame to the next, so you need a higher frame rate to compensate for fast motion.
