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09/21/2007 02:52:24 AM · #1 |
... how come that mother nature did not give to human being eyes with optical zoom capabilities? ... or would it be more "natural" to have some kind of "digital" zoom capability in our brain ?
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09/21/2007 03:51:14 AM · #2 |
I wish my dynamic range was bigger
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09/21/2007 06:29:20 AM · #3 |
i'd like super sensitivity to IR.
then i can see my way at night easier |
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09/21/2007 06:32:18 AM · #4 |
Originally posted by crayon:
i'd like super sensitivity to IR.
then i can see my way at night easier |
Eat more carrots! |
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09/21/2007 08:18:20 AM · #5 |
The eye does in fact already have a similar feature: the "pixels" in your eye are much more densely packed in the central part of the viewing field. So, it's like you have a sharp tele and a blurry wide-angle at the same time. Or a a continuous range of such.
Of course, the eye/brain combo also has
* Auto-focus
* Auto-exposure
* Auto-ISO
And I guess it also automatically detecs dead pixels and "heals" them. Needless to say, the "post-processing" is much more advanced than in any camera - face and general object recognition, 3D vision...
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09/21/2007 09:11:40 AM · #6 |
This guy had both the zoom and the night vision. But it wasn't evolutionary.
Message edited by author 2007-09-21 09:13:12.
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09/21/2007 10:01:44 AM · #7 |
Originally posted by goc:
... how come that mother nature did not give to human being eyes with optical zoom capabilities? ... or would it be more "natural" to have some kind of "digital" zoom capability in our brain ? |
The evolution of the eye is a fascinating thing. Especially the very many ways that it has evolved, and how it has developed in some species to a greater or lesser degree.
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09/21/2007 11:51:57 AM · #8 |
Originally posted by goc:
... how come that mother nature did not give to human being eyes with optical zoom capabilities? ... or would it be more "natural" to have some kind of "digital" zoom capability in our brain ? |
Digital zoom it is. As someone already mentioned we have many more sensor "pixels" in the macula. This allows us to "pixel peep" and get much more detail. Also we have a digital signal processing chip like all the great digital cameras.
To show this zoom really works, recall when you first got into photography. If your experience is like mine, you were really disappointed with images taken of birds and small animals. They were so small in the frame compared to how they appeared in the minds eye.
In a recent PBS program a astronomer was featured who used the old time method of looking thru the telescope and sketching images of what he saw. Long before spacecraft visited the Saturnian system he sketched the "spokes" in the rings of Saturn. His peers called him crazy, and accused him of letting his imagination run wild, like some of the early astronomers did when they sketched canals on Mars. Well imagine their surprise when a visiting spacecraft imaged the spokes and they looked exactly like the astronomers sketches. So now I have to wonder if there was running water on Mars in the 19th century. But I digress......
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09/21/2007 12:00:48 PM · #9 |
| According to this, our built-in cameras are about 22mm, f/3.2, ISO800, 576 megapixels. Not too shabby! |
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09/21/2007 12:10:31 PM · #10 |
It's important to remember that the way we see is very different from the way a camera "sees"... Our interpretation of what strikes our eyes is (to stretch the analogy to the breaking point) the result of heavy post-processing. For example, the blind spot in the middle of the eye - you can't see directly in front of you. Your brain assembles multiple images and interpolates across this blind spot to make it invisible. If a camera had a similar blank spot in the middle of the image it would be very obvious.
Similarly, you tend not to notice "depth of field" when you're looking at a landscape; it's there, but your brain corrects for it by merging lots and lots of information.
So the whole eye-camera analogy falls apart pretty quickly in practice. |
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09/21/2007 12:17:33 PM · #11 |
Originally posted by scalvert:
According to this, our built-in cameras are about 22mm, f/3.2, ISO800, 576 megapixels. Not too shabby! |
In dark our eyes seem like ISO 3600. Very noisy! |
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09/21/2007 01:39:44 PM · #12 |
So you're telling me you can't "zoom" your eyesight? I can zoom in to about 60x without pixelization...
....I thought everyone could do it
...you're pulling my leg right? I can't be the only human with this capability.
Skid |
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09/21/2007 01:40:39 PM · #13 |
Originally posted by biteme:
In dark our eyes seem like ISO 3600. Very noisy! |
No, that's your ears. ;-P |
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09/21/2007 01:42:06 PM · #14 |
Originally posted by kenskid:
So you're telling me you can't "zoom" your eyesight? |
Sure you can. You just need a tele-extender to do it... binoculars or a telescope. |
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09/21/2007 01:44:38 PM · #15 |
Originally posted by johst582:
Of course, the eye/brain combo also has
* Auto-focus
* Auto-exposure
* Auto-ISO
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Don't forget auto-white balance |
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09/21/2007 01:54:40 PM · #16 |
Originally posted by scalvert:
Originally posted by biteme:
In dark our eyes seem like ISO 3600. Very noisy! |
No, that's your ears. ;-P |
pffffffrt
:P |
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09/21/2007 05:51:05 PM · #17 |
Originally posted by twilson944:
Originally posted by johst582:
Of course, the eye/brain combo also has
* Auto-focus
* Auto-exposure
* Auto-ISO
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Don't forget auto-white balance |
Awesome ! |
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09/21/2007 09:59:33 PM · #18 |
Originally posted by twilson944:
Originally posted by johst582:
Of course, the eye/brain combo also has
* Auto-focus
* Auto-exposure
* Auto-ISO
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Don't forget auto-white balance |
And yet we can be tricked so easily and so thoroughly by the simplest of optical illusions! |
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09/21/2007 11:55:53 PM · #19 |
And yet we can be tricked so easily and so thoroughly by the simplest of optical illusions! [/quote]
Wow, those are amazing! I've seen a couple of them before, but they all show how the eye can be so easily deceived.
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09/22/2007 09:47:51 AM · #20 |
Originally posted by biteme:
Originally posted by scalvert:
According to this, our built-in cameras are about 22mm, f/3.2, ISO800, 576 megapixels. Not too shabby! |
In dark our eyes seem like ISO 3600. Very noisy! |
According to the interesting article, it is about the ISO range is about 1 (one) to 800 - so the noise is relative to the amazing low ISO capability normally!
One thing I would add is that the eye's colour receptors are much less sensitive than the black and white ones, so high ISO/night vision is black and white only.
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