Name: 目の解像度は？ (What Is The Resolution Of The Eye?)
Uploaded: 2021-01-14T05:18:16.000Z
Duration: 9 min 44 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

Michael here. I am at the White House in America's capital

Washington DC America makes alot of feature films every year

Hollywood but they don't make the most feature films every year Nigeria makes more

but the country that makes the most films every single year is

of India fills up enough film with unique feature films

that stretch all the way from this city, Mumbai, to where I live

in London that's double what hollywood produces in two years

real-life a movie? I've discussed the frame rate of the human eye before but how

of the human eye compare to a camera or screen?

Blu ray, IMAX. Numbers like these are pixel dimensions when multiplied

they tell us the total number of picture elements an image is made up of

a figure often used to describe digital cameras it might sound like

more is better but to be sure numbers like 1920 by 1080

are not resolutions per say more pixels is only part

of the equation. Resolution is about distinguishing

fine details and that depends on a lot of other factors

for instance the amount of light the sizeof the sensors

what the millions of pixels are actually encoding and

Salvador Dali's painting of his wife looking at the Mediterranean can be

well it's Abraham Lincoln. for crying out loud on a small enough screen

from far enough away low and high so-called resolutions on screens aren't

how different nearby pixels are from one another also matters this is called

the number of pixels in the video frame stays the same but you can't resolve as much

detail now with all this in mind we can still

compare human vision to a digital image by asking a better question

assuming everything else is optimal how many pixels would you need to make an

image on a screen large enough to fill your entire field of view

look like real life, without any detectable

because a camera snaps an entire frame at once whereas

our eyes move around. The brain amalgamate

their constant stream of information into what we call vision

sight, in fact the image created by the eyeball alone during a single glance

would hardly even be acceptable on a broken TV screen. We think

our eyes create images like this picture Guy took of me with a camera

but for one thing unlike a camera you've got some stuff

looking at your own nose and maybe even glasses

if you have them. Luckily our brains process those stimuli out because they

and they don't change but thinking those are the only difference

Latinly. The fovea gets its name from the Latin for

pitfall, the fovea is the pit on your retina that receives light from the

of your field of view about the area covered by both your thumbs

when held at arms length away. Optimal colour vision and 2020 acuity

only possible within that little area when it comes to these limitations XKCD

it points out other problems like blind spots literal blank spaces

in our vision where the optic nerve meets up with the retina

and no visual information is received if you bought

a camera that did this you would return it

you can find your own blind spot by closing

you're right eye fixating your left eye on a point in front of you

extending your left thumb and then moving it

left-of-center slightly slowly carefully until

it's not there anymore crazy but of course

we don't see the world horribly like this because our eyes are constantly moving

dragging foveal resolution where ever we need it

and our brains complex visual system fills in details

merges images from both eyes and makes a lot of gueses what we can actually see

is a processed image not computer-generated imagery but

well meat generated imagery the neon color spreading illusion

is a great way to demonstrate this difference there is no

blue circle in this picture the white here

isn't fooled, a screen isn't fooled, only

you and the fleeting gumbo of ingredients you call perception

is not analogous to a camera but our reformulated question can still be

answered because human anatomy allows us to resolve to differentiate certain

used a figure of 0.59 arcminutes as the resolution of the human eye to calculate

based on the size of our total field of view

how many of these distinct elements could fit inside of it

the result was an approximation of exactly what we want to know

how many individual picture elements pixels our vision can appreciate

that many pixels packed inside a screen large enough to fill

your entire field of view regardless of proximity

would be close enough to be undetectable by the average

human eye. But we should factor in the fovea

because Clarks calculation assumes optimal acuity everywhere, it allows the

but a single glance is more analogous to a camera snap and as it turns out

only about seven megapixels packed into the two degrees of

optimal acuity the fovea covers during a fixed stare