Testing the FPS of our eyes

[manikyath]

7 minutes ago, Praesi said:

Eyes dont see in FPS.

you know, at least read the first two paragraphs of the OP...

 

on topic: should add this *has* to be done in natural light (AKA sunlight) because mains voltage is 50 or 60Hz, meaning your eyes will "see" the disk at 50/60fps, because of the flickering of the light.

 

if you ever messed with cheap LEDs you may have noticed it looks "low FPS" when you move your hand back and forth in the light - same effect, more noticable.

 

this is also why studios have SUPER expensive lights, and certainly high speed recording studios do, since the light "flicker" can have an effect on resulting image quality.

[You_are_a_cunt]

2 minutes ago, manikyath said:

you know, at least read the first two paragraphs of the OP...

 

on topic: should add this *has* to be done in natural light (AKA sunlight) because mains voltage is 50 or 60Hz, meaning your eyes will "see" the disk at 50/60fps, because of the flickering of the light.

 

if you ever messed with cheap LEDs you may have noticed it looks "low FPS" when you move your hand back and forth in the light - same effect, more noticable.

 

this is also why studios have SUPER expensive lights, and certainly high speed recording studios do, since the light "flicker" can have an effect on resulting image quality.

also one of the reasons that filter capacitors are a thing

[FloRolf]

14 minutes ago, Praesi said:

Eyes dont see in FPS.

ugh... i hate Germans...

 

 

 

But can't you actually simulate that test on a 144hz Monitor for example? I mean, you could only measure as high as 144 but i doubt i'd get above that even.

[manikyath]

7 minutes ago, FloRolf said:

ugh... i hate Germans...

 

 

 

But can't you actually simulate that test on a 144hz Monitor for example? I mean, you could only measure as high as 144 but i doubt i'd get above that even.

the issue is your eyes would just see the 144Hz.

 

thats also why TV manufacturers are doing the "bajillion Hz backlight" thing, the flicker makes our eyes preceive the image as smoother, even though it isnt.

[FloRolf]

5 minutes ago, manikyath said:

the issue is your eyes would just see the 144Hz.

 

thats also why TV manufacturers are doing the "bajillion Hz backlight" thing, the flicker makes our eyes preceive the image as smoother, even though it isnt.

Yeah i know, but if let's say, my result was like 110FPS perception anyways, then a 144hz Display would do the Job wouldnt it?

Or would the flickering and whatever ruin the result?

[manikyath]

2 minutes ago, FloRolf said:

Yeah i know, but if let's say, my result was like 110FPS perception anyways, then a 144hz Display would do the Job wouldnt it?

Or would the flickering and whatever ruin the result?

the thing is our eyes adjust really well to what's in front of them. there's greater minds than you and i working on this topic, and these minds have suggested at around 600Hz the eyes lose the preception of the flicker all together and start to intepret it as a smooth image.

 

i should look into this topic more tbh, but i dont really care because i'm happy with 60Hz in front of my nose

[bgibbz]

7 hours ago, Praesi said:

Eyes dont see in FPS.

Really bro?! Your eyes must see in 0 fps in order for you to be incapable of reading the original post. 

[vanished]

8 hours ago, FloRolf said:

But can't you actually simulate that test on a 144hz Monitor for example? I mean, you could only measure as high as 144 but i doubt i'd get above that even.

I think we'd want to start the tests around 144 hz or 165 hz and go up from there.  I expect the results to be over 200 or 300 fps

[clementk]

 This was a good video about this i tryed to find the information about the military tests but could not..

[BrightCandle]

http://www.crystalinks.com/wagonwheeleffect.html

 

Quote

The first to observe the wagon-wheel effect under truly continuous illumination (such as from the sun) was Schouten (1967). He distinguished three forms of subjective stroboscopy which he called alpha, beta, and gamma: Alpha stroboscopy occurs at 8-12 cycles per second; the wheel appears to become stationary, although "some sectors [spokes] look as though they are performing a hurdle race over the standing ones" (p. 48). Beta stroboscopy occurs at 30-35 cycles per second: "The distinctness of the pattern has all but disappeared. At times a definite counterrotation is seen of a grayish striped pattern" (pp. 48-49). Gamma stroboscopy occurs at 40-100 cycles per second: "The disk appears almost uniform except that at all sector frequencies a standing grayish pattern is seen ... in a quivery sort of standstill

 

But critically its important to understand its quite rare and usually a trick requiring a specific layout of patterns to work, we don't perceive all rotations with the wagon wheel effect. Most of what we see as the still fan blades is just an artifact of cameras, its not what we see in real life. It also doesn't say much about the FPS that we need to fool the eyes into not being able to distinguish from reality because we already have tests at considerably higher frame rates where we know the motion is better, so it isn't a useful experiment other than being another weird way our eyes have odd artefacts they see.

[xentropa]

On 6/2/2016 at 3:54 PM, revsilverspine said:

Finally found it!

A nice little "explanation" with some useful info and sources: http://us.battle.net/wow/en/forum/topic/7199031187

 

 

That is not actually seeing 220 fps.  That only means that within the single refresh rate of a human eye (assume for now 1/60th of a second), a 1/220th second burst of light is sufficient enough to be recognizable to the human eye.  

 

Likewise a bolt of lightning lasts between 1 to 50 microseconds, well below the human eye refresh rate.  We can only tell that a lightning flash took place, but we couldn't figure out how long it lasted.

 

For the same experiment, flash the image 1/220th of a second.  Then flash the image twice as bright for 1/440th of a second.  If they can tell the difference then they can truly see 220 fps.