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Topic Title: Eye definition
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Created On: 11/14/2008 09:19 PM
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 11/14/2008 09:19 PM
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Firestrider
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At the Financial Analyst Day AMD mentioned "eye definition" and they said the human eye can see 576 megapixels with a 120 degree viewing angle.

What does this mean in pixel density in ppi?
 11/15/2008 01:43 AM
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MD - Moderator
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Field of vision is 190* I thought...

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 11/15/2008 11:58 AM
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fizzbang
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You can't easily describe the human eye in terms of a fixed ppi resolution...there's too much going on. I used to have links to pages that described rod/cone densities and distribution over the interior, curved surface of the retina, the role of the fovea (hi-resolution area) vs. peripheral receptors, the automatic, tiny movement of the eyes which essentially allows the brain to build up a sub-pixel type image, etc. Then there's the brain itself, it adds, subtracts, adjusts, enhances, then combines the information from both eyes in order to increase the resolution of the final, perceived, image.

Are they saying that the theoretical mega pixel equivalence of the human eye under certain conditions is 576MP? I'll see if I can find those links.

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 11/17/2008 01:28 AM
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Overmind
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I concur with fizzbang. In addition, the fron vision is very different to the peripheral one (that can detect way higher refresh rates, for example).

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 11/17/2008 01:52 AM
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Xajel
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I agree with fizzbang,
AFAIK the distribution of rod/cone is not static in the whole retina, the closer you get to the center the more resolution you will have till you reach the optic nerve that connect to the brain where the resolution is zero ( it called the blind spot ). this uneven distribution is more in Cones ( color ) than Rods ( B&W )...

here's two quotes from wikipedia
In adult humans the entire retina is 72% of a sphere about 22 mm in diameter. The entire retina contains about 7 million cones and 75 to 150 million rods. An area of the retina is the optic disc, sometimes known as "the blind spot" because it lacks photoreceptors. It appears as an oval white area of 3 mm².


A commonly cited figure of six million in the human eye was found by Osterberg[1] in 1935. Oyster's textbook (1999) cites work by Curcio et al. (1990) indicating an average closer to 4.5 million cone cells and 90 million rod cells in the human retina.


BTW, the number of Cones does not equal the number of pixels, as each cone is able to sense a specified color, there's three types of Cone's: S, L & M for Red, Green & Blue...

the resolution is vary between peoples and also vary in light and dark, in dark the resolution is much more duo to the Rod's are used more than Cones and Rod's are about 20 times the Cones in count...
 11/17/2008 03:15 AM
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Decembermouse
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I'm colorblind. There's red/green, blue/orange, and other types, I see essentially black and white. I get a lot of crap for it and people forget about it all the time, you know "check out the guy in the yellow shirt" or "the blue cup" or stuff. Everyone uses it to identify stuff. Also I had lazy eye when I was a kid- not where it would wander, but my right eye just never bothered to focus, so my brain has learned not to listen to it. Long story short my left eye is great, but no color and no depth perception. Supposedly the colorblind have better night vision due to more sensitive rod cells. As for megapixels, no idea. I'm running 1920x1200 and can see a dead/stuck pixel from almost two feet away I guess, is how far back I sit...? Sorry, rambling 3am post.

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 11/18/2008 11:54 PM
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estricklin
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I had the same problem Decembermouse, if only I'd have worn that patch I'd have a decent left eye. I'm colorblind as well and I find that I do see better than most when its really dark.

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 11/19/2008 12:36 AM
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Decembermouse
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Yeah it's weird isn't it? I did the eye patch, Coke-bottle bottom glasses, the works. After a certain point my optometrist threw in the towel and told us it wasn't going to get any better. If I close my left eye, my right one is never in focus, which is how I know it isn't doing its job. Also, if both are open and I cover the right one, my point of perspective doesn't change. I can manually focus the right one, though, but only if the left one is closed. Everything looks a little weird with the right one, as if the refresh rate is only 2/3 of what it should be. It takes two to three times as long to focus and if I overshoot then I have to let it go back to its neutral point and try again... good times! I should cut it out and put something useful in there.

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ASRock M3A785GMH/128M
Phenom II X4 925c2 @ 2.80GHz (95W)
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 11/19/2008 02:33 AM
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Overmind
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The basic colors such as red/blue/green/yellow can still be detected even if you see only black/white. There are a few good to know tricks like the blue vs. red one.

About the right/left problem, it appears that your left eye is the primary one and the right one is almost unused. You should try to use the right one very ofter (when possible by covering the left one) so it will adapt and start to function better.

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 11/19/2008 08:30 AM
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fizzbang
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Here's one of the articles I was looking for. He references the 576 MP number, but notes that it was calculated using only a 120° field of view. He also gets into color, contrast, dynamic range, etc. Interesting stuff.

-------------------------
939Dual-SATA2 v1.05, BIOS v2.31
Opteron 165 (CCBWE 0550UPMW) @2.7GHz, 1.35V
TWINX2048-3200C2PT 2.5-3-3-6 1T
Thermaltake Big Typhoon
ATI X1800GTO
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