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DPChallenge Forums >> General Discussion >> if our eye is a digicam
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05/08/2006 02:52:10 AM · #1
what would the specs be? ;)
05/08/2006 02:54:47 AM · #2
Actually, i've always wondered, how many million pixels can the human eye see?
05/08/2006 03:02:38 AM · #3
Well from what I have seen. The eye has two primary cells for light and color/detail.
The cells are Rods which handle vision in low light, and cones handle color vision and detail.
The human eye has 100 million Rods and 7 million cones. So that tells me that the human eye relies on roughly 14X the amount of cells for light than it does on color and vision.

05/08/2006 08:20:00 AM · #4
So we have 2x 7 mega pixel lenses?

Eye's are strange, we can't actually see a lot of what we think we see, our brain fills in the gaps of what it thinks should be there.
05/08/2006 08:29:48 AM · #5
we also have to remember that (in most cases) humans have two eyes for depth perception. camera's dont normally have two lenses. Would we have to multiply these MP's by two or even square them? (i suck at math, and physics so dont ask me there)
05/08/2006 09:30:40 PM · #6
so far from your replies, the human-eye-digicam would be:

- have 2 lens & sensors
- each sensor has 2 photosites for light and colour
- it uses interpolation to fill in gaps
- pixel count of the final image is multiplied by the amount of pixels on each sensor

COOL !!!
05/08/2006 09:35:07 PM · #7
My in camera (eye) sharpening is terrible, i can't reset it and I have to use external lenses for focus correction. I thought about sending them in for warranty repair, but the one year warranty ran out a little while ago. :-)
05/08/2006 09:40:17 PM · #8
I have defective sensors with large groups of dead pixels and also lens misallignment.
05/08/2006 09:41:00 PM · #9
I think I might like to upgrade mine to an "L" version. :-)
05/08/2006 09:43:47 PM · #10
Originally posted by OdysseyF22:

I think I might like to upgrade mine to an "L" version. :-)


Oh believe me when I say your eyes are much faster than any L or EX lens available out there! lol
05/08/2006 10:02:22 PM · #11
Originally posted by crayon:

Originally posted by OdysseyF22:

I think I might like to upgrade mine to an "L" version. :-)


Oh believe me when I say your eyes are much faster than any L or EX lens available out there! lol


Actually, the "standard" human eye has a focal length (non-accommodated) of about 22.8mm, and a maximum iris diameter of about 7mm, giving about f/3.2
The "sensor" has both highly effecient "luminance" sensors (rods) and less efficient "chrominance" sensors (cones), so the dynamic range is very large. We have about 120 million rods!

Edit: our "pixel size" is about 2µm.

Here, and here is some good "light reading" pardon the pun.

Message edited by author 2006-05-08 22:03:59.
05/08/2006 10:03:59 PM · #12
Originally posted by kirbic:

We have about 120 million rods!


and arranged in a circular body, how smart! :)
05/08/2006 10:05:12 PM · #13
At a 120 degree field of view, it is estimated the human eye is approximately 576 megapixels. Some of this is due to interpolation.

At night, the human eye has a rough equivalent of ISO 800. During the day, the eye has a rough equivalent of ISO 1. That is about 11 stops of range compared to advanced cameras having about 6 stops. Recall that each stop is a doubling of the previous amount of light.

In low light the human eye has a range of contrast detection of approximately 1 million to 1. In brighter light it is probably closer to 10,000 to 1. Both far exceed camera sensors.

I've always been frustrated at the camera's lack of dynamic range. When I'm hiking in the forest and see nicely backlit leaves or moss giving off that greenish glow I soooo want to capture it. It never works.

05/08/2006 10:16:45 PM · #14
Not to mention a nearly infinite memory card that is not as likely to crash and erase all your images. It, however, does happen on occasion.

And my lenses are also getting misaligned now and I keep having to add on an adaptor on the front to correct for autofocus issues...
05/08/2006 10:20:13 PM · #15
And what mm zoom would are our eyes? I've always wondered that. When I look into my camera, the things seem farther away then they really are, until I zoom in further.
05/08/2006 10:29:00 PM · #16
here

and here

and here

and finally here

so many types of evaluation but not much on the individual limits due to correction, age, drug use, alcohol consumption, etc.

Message edited by author 2006-05-08 23:15:19.
05/08/2006 10:39:05 PM · #17
Hey tom, look UP to kirbic's post.

About 22.8mm focal length.

I never noticed how our eyes have a natural depth of field until I started doing stuff with cameras.

Using a camera is a great way to increase the appreciation we have for our eyes...

Don't forget too that our eyes can see full color information at each photosite... Most current digicams can only see one color at each photosite.

That's probably why DrAchoo posted such a large number of megapixels even though we are only talking about 120 million rods and so many cones.

I upgraded to L series lenses with laser surgery... I now get better than 20/20 vision.

Much like certain L lenses though, I'm still subject to a little bit of aberration at the edges of my lenses which shows up when the aperture is wide open and in high light contrast areas...
05/08/2006 10:43:59 PM · #18
pop quiz!

how many of you are guilty of spending tonnes of money for the lens in front of the camera, but spend only a tiny bit for the lens in front of our eyes (eye glasses) ? ;)
05/08/2006 10:47:28 PM · #19
Interesting.

It was specifically the money I had saved for a 20D that I spent on laser surgery. It delayed my DSLR purchase by a year.

Not a bad thing, I learned a lot in that year.

I'm VERY happy with the 30D and I like some of the things it can do better than the 20D.

The money spent on my eyes would have bought me the 20D plus a Tamron 28-75 f/2.8

I did not have medical insurance here, so the additional visits after the fact ended up costing me a fair bit.

Message edited by author 2006-05-08 22:48:09.
05/08/2006 10:54:51 PM · #20
Originally posted by eschelar:

Don't forget too that our eyes can see full color information at each photosite... Most current digicams can only see one color at each photosite.

Not true -- the cone cells are divided up into those sensitive to Red, Green, and Blue, in a very similar way to that used in a camera sensor or CRT screen.
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