The Cellar
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The Cellar (http://cellar.org/index.php)
-   Image of the Day (http://cellar.org/forumdisplay.php?f=10)
-   -   Jan 21, 2009: Digital Weird (http://cellar.org/showthread.php?t=19321)

xoxoxoBruce 01-21-2009 12:02 AM
Jan 21, 2009: Digital Weird
 
The guy that took this picture says;

Quote:
The cheap CMOS sensor of an iPhone does not expose the whole thing at once, it scans from left to right. If you take a picture of something that moves very fast (like an airplane prop) you can get some crazy pictures out of it since each column represents a slightly different time.
http://cellar.org/2009/iphone.jpg

Anybody with an iPhone seen this happen?

Link

Scriveyn 01-21-2009 01:09 AM
There are classic (non-digital) SLR cameras which have a slit moving across the film (focal plane shutter) rather than a central shutter. I dimly remember reading about strange effects that can be produced by these, so I looked it up on wikipedia (see quote below). - So this not an effect new or restricted to digi-cams.

Quote:
Originally Posted by from wikipedia
Distortion of fast-moving objects: although no part of the film is exposed for longer than the time set on the dial, one edge of the film is exposed an appreciable time after the other, so that a horizontally moving shutter will, for example, elongate or shorten the image of a car speeding in the same or the opposite direction to the shutter movement. For an example of such distortions see this image taken with a vertically traveling focal-plane shutter, showing extreme distortion of fast-moving helicopter rotor blades.

Knight f3 01-21-2009 02:24 AM
Seen it
 
The cellar had already documented this phenomenon. As I recall, a guy had modified a flatbed scanner to work as a digital camera and he would get similar weirdness in his photos of moving objects.
Although for a flatbed scanner, slowly moving would be enough to cause crazy images.

Still looks cool though.

Gravdigr 01-21-2009 03:52 AM
Cool how the camera even manufactured the parts of the prop that wouldn't be visible, at all. You know, covered by the nose cone. Yeah, that's cool, a camera that automatically photoshops your pics for ya. Awesome.:bs:

SPUCK 01-21-2009 04:55 AM
Quote:
Although for a flatbed scanner, slowly moving would be enough to cause crazy images.
That's how he tried to explain those pictures of his butt??

sweetwater 01-21-2009 06:39 AM
It's new to me and now I want to borrow someone's iPhone to see if I can replicate the effect. Let me borrow yours, OK? ;)

glatt 01-21-2009 07:33 AM
Quote:
Originally Posted by Knight f3 (Post 524778)
a guy had modified a flatbed scanner to work as a digital camera and he would get similar weirdness in his photos of moving objects.
That would be Matthias Wandel. He amazes me with the stuff he invents.

Undertoad 01-21-2009 07:53 AM
Wasn't that footer?

glatt 01-21-2009 08:56 AM
Oh, maybe. But I was focusing on the weird digital time/motion capture aspect of it.

footfootfoot 01-21-2009 09:21 AM
No, but I wanted to do that with an old scanner I had. Matthias and I are cut from the same cloth though.

Sundae 01-21-2009 09:40 AM
Quote:
Originally Posted by Gravdigr (Post 524781)
Cool how the camera even manufactured the parts of the prop that wouldn't be visible, at all. You know, covered by the nose cone. Yeah, that's cool, a camera that automatically photoshops your pics for ya. Awesome.
Ooh, ooh! I want one of those, do you know where they sell them?

Wombat 01-21-2009 04:15 PM
Quote:
Originally Posted by Gravdigr (Post 524781)
Cool how the camera even manufactured the parts of the prop that wouldn't be visible, at all. You know, covered by the nose cone. Yeah, that's cool, a camera that automatically photoshops your pics for ya. Awesome.:bs:
Nose cones don't cover the propeller blades. The blades come out the side of the nose cone. Which makes the photo plausibly real, not photoshopped.

Here are some pics of stationary propellers so you can see how the blades come out the side of the nose cone:

http://upload.wikimedia.org/wikipedi...er.details.jpg
http://www.spotmatic.org/images/airplane_propeller.jpg
http://www.regional-air-express.com/img/presse/17.jpg

newtimer 01-21-2009 06:07 PM
You stood a few feet in front of a spinning propeller just to take a photo? And the wheels aren't chocked, either. Sounds like a Darwin award waiting to happen.

By the way, where is Bruce now? He hasn't said anything since he posted the picture.
Bruce? Hello? Let us know you're alright.

Agent-G 01-21-2009 06:31 PM
no, I have never tried this with my iphone, but I think I might try it now.

Elspode 01-21-2009 09:53 PM
I'll see what I can do with my iPhone. Looks like a noble cause.


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