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#21
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My new flying rule - bring camera
No, I mean in MegaPixels.
"Jim Macklin" wrote in news:POzWg.1483 $XX2.194@dukeread04: About 1 minute of angle if there is good light and contrast. "Judah" wrote in message . .. | What is the resolution of the human eye, anyway? |
#22
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My new flying rule - bring camera
"Bob Chilcoat" wrote in
news Having my camera with me the day I landed on 4R at EWR in the Archer nearly caused a bad day. On short final approaching the numbers, I couldn't resist snapping a pic of that runway disappearing into the perspective. I grabbed the camera off the right seat, flipped off the lens cap and got a great shot through the prop: http://www.geocities.com/viewptmd/EWR4RShortFinal.JPG. Unfortunately, the camera strap got tangled up in the yoke. I had approval to land long, which was a good thing because after finally getting the strap free, I realized I had ballooned up 100 feet or so. Fly the airplane! The tower didn't say anything, and I set it down right where I had originally wanted to, but it could have been bad, and/or embarrassing. Nah. They probably didn't know what to expect... When do you think was the last time they saw an Archer land? |
#23
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My new flying rule - bring camera
"Judah" wrote in message
. .. No, I mean in MegaPixels. That depends on both your estimate of angular resolution as well as your estimate of the high-resolution field of view. Both vary considerably. As an example, let's say that for the purpose of your question, we consider only the field of view attributable to the fovea (the part of the eye that has only cones, and no rods...this is considered the limit of "high-resolution" vision...you can see a much wider field of view than this, but without nearly the same detail as in the center of your vision). A quick Google search turns up estimates of foveal field of view between 4 degrees and 15 degrees. So already we have quite a discrepancy of estimates. If we accept the 1 minute of angle estimate for angular resolution, that gives us between 240 and 900 units of vision across the field of view. Call those the equivalent of pixels, and assume a perfectly circular visual reception, and you get between 45K and 636K "pixels". So in megapixels, that's between 0.045 and 0.636. That said, this is a pretty simplistic analysis of the equivalent in megapixels of human vision. Human vision is different than digital vision in a variety of ways, and a direct mapping such as shown above is leaving out a lot of other factors that may affect total effective resolution. But at the very least, this gives you a ballpark minimum starting point. Also keep in mind that a digital camera may or may not have a lens capable of resolving in perfect detail the total resolution available on the image detector (usually a CCD). So you may have an 8MP camera, but when you look at an image zoomed on a computer screen at a one-display-pixel-per-image-pixel ratio, you may find a variety of artifacts in the digital image. So basically, human vision may be better than the theoretically calculated resolution, while a digital camera may have less than the theoretically calculated resolution. It's really hard to compare in a true apples-to-apples way. Pete |
#24
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My new flying rule - bring camera
Google
Clarkvision Photography - Resolution of the Human Eye At any one moment, you actually do not perceive that many pixels, but your eye moves around the scene to see all the detail you want. But the human eye ... http://www.clarkvision.com/imagedeta...esolution.html - 12k - Cached - Similar pages Visual Acuity and Digital Images It turns out that the human eye only has a certain number of light detectors in it. ... However, in digital images, the pixels or dots are square. .... www.blaha.net/Main%20Visual%20Acuity.htm - 53k - Cached - Similar pages [DOC] http://clarkvision File Format: Microsoft Word - View as HTML The Human eye is able to function in bright sunlight and view faint starlight, ... Visual acuity is defined as 1/a where a is the response in x/arc-minute. ... http://www.nhn.ou.edu/~johnson/Educa...Range-2005.doc - Similar pages TECHNOLOGY CORNER ACUITY IN PRACTICE. A single human eye sees roughly a 140-degree field ... Now, let's calculate the distance between scanning line centers and pixel centers ... http://www.tvtechnology.com/features...features.shtml - 25k - Cached - Similar pages Visual Acuity in Sensory Substitution for the Blind In measuring the visual acuity of normal human vision, the eyes move around ... with a typical horizontal resolution of 176 pixels for the PC camera input, ... www.seeingwithsound.com/acuity.htm - Similar pages HDTV displays: How good do they need to be? Thus, screens don't have lines any more, only rows or columns of pixels. .... The human visual acuity is 20/20 at any distance if the height of the ... broadcastengineering.com/hdtv-displays/ - 67k - Cached - Similar pages "Judah" wrote in message . .. | No, I mean in MegaPixels. | | "Jim Macklin" wrote in news:POzWg.1483 | $XX2.194@dukeread04: | | About 1 minute of angle if there is good light and contrast. | "Judah" wrote in message | . .. | | What is the resolution of the human eye, anyway? |
#25
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My new flying rule - bring camera
"Peter Duniho" wrote in
: "Judah" wrote in message . .. No, I mean in MegaPixels. That depends on both your estimate of angular resolution as well as your estimate of the high-resolution field of view. Both vary considerably. snip Call those the equivalent of pixels, and assume a perfectly circular visual reception, and you get between 45K and 636K "pixels". So in megapixels, that's between 0.045 and 0.636. snip So basically, human vision may be better than the theoretically calculated resolution, while a digital camera may have less than the theoretically calculated resolution. It's really hard to compare in a true apples-to-apples way. So what you're basically saying is that my idea of plugging a BlueTooth interface into one's cereberal cortex is impractical until we first come up with a way to upgrade the eyes to a higher megapixel rating... I guess that makes some sense - I can't really tell the difference between a 1 MP image and an 8MP image... |
#26
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My new flying rule - bring camera
yep - I've been kind of dumb these past few fall flights. Today
was yet another absolutely perfect flying day (today's flight is the reason I own an airplane). I'm still kicking myself for not having my camera. After trashing two Canon Elph cameras (by keeping them in my pocket all the time, and fouling the auto-focus lens with pocket lint), I purchased a little velcro belt pouch for it. I wear it like a cell phone, and the camera is with me at all times. My kids think I look like a geek (and I do), but I've always got the camera along, and never "miss the moment"... -- Jay Honeck Iowa City, IA Pathfinder N56993 www.AlexisParkInn.com "Your Aviation Destination" |
#27
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My new flying rule - bring camera
On Mon, 09 Oct 2006 12:16:48 GMT, B A R R Y
wrote: Yesterday morning , there was a 100 ft thick layer of ground fog over the CT River valley, with unlimited ceilings to either side. Buildings and towers were poking through a smooth, white blanket! I was also sans-camera... 8^( Years ago I was flying up the Jersey shore over a fog bank. Passing Atlantic CIty, the only building visible above the could was the top of the Playboy Club casino... all you could see was the rabbit... and of course, no camera. My favorite missed picture, though, was when PPGing at Fantasy of Flight a few years back. A hot air balloon was just landing at the field, and for one brief moment I could see the balloon, its perfect inverted reflection in glass smooth water of a pond... the scene perfectly bisected by the triple tail of the museum's Constellation. Barry, ya gotta drop by at Griswold one of these days, yesterday was jumpin' there. Mini-flyin on 10/29... -Dana -- -- If replying by email, please make the obvious changes. ------------------------------------------------------------------------------- If people behaved like governments, you'd call the cops. |
#28
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My new flying rule - bring camera
"Ron Lee" wrote in message ... This was taken last month on a breakfast flight to Leadville CO. No camera...no pics. http://home.pcisys.net/~ronlee/RV6A/...Sep06Small.jpg That is a great pic! You got a link for a high resolution version? Just curious, but what reference points on the planes do the wingmen use for lining up on lead? Root trailing edge to roll bar? -- Jim in NC |
#29
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My new flying rule - bring camera
"Judah" wrote in message
. .. So what you're basically saying is that my idea of plugging a BlueTooth interface into one's cereberal cortex is impractical until we first come up with a way to upgrade the eyes to a higher megapixel rating... No, not at all. If you come up with a 100% safe means to do that, I'll be one of the first customers, especially if you include a "last 5 minutes" video loop buffer. Resolution is not always the most important aspect of photography. So, get to work! |
#30
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My new flying rule - bring camera
"Morgans" wrote:
Just curious, but what reference points on the planes do the wingmen use for lining up on lead? Root trailing edge to roll bar? -- Jim in NC Link sent via email. I don't know what the reference points are. My formation flying is very limited. Maybe someone else can answer that question. Ron Lee |
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