Jan 21, 2009: Digital Weird

xoxoxoBruce · 01-21-2009, 12:02 AM

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.

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

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.

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

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 Girl · 01-21-2009, 09:40 AM

Quote:

Originally Posted by Gravdigr

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

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.

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:

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.

01-21-2009, 02:24 AM	#3
Knight f3 Fellow-Commoner Join Date: Nov 2008 Posts: 10	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.

01-21-2009, 03:52 AM	#4
Gravdigr Junior Master Dwellar Join Date: Apr 2007 Location: South Central...KY that is Posts: 2,868	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. __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements, please feel free to fuck right off.

01-21-2009, 06:39 AM	#6
sweetwater lives inside a Mobius strip Join Date: Dec 2007 Posts: 1,109	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? __________________ I knew I shoulda taken that left turn at Albuquerque! - Bugs Bunny

01-21-2009, 09:21 AM	#10
footfootfoot Rent this space Join Date: Aug 2004 Location: in the house and on the street Posts: 5,837	No, but I wanted to do that with an old scanner I had. Matthias and I are cut from the same cloth though. __________________ Maybe we could just burn her a little? Like a cigarette burn or something. --DanaC

01-21-2009, 09:53 PM	#15
Elspode Serve ice cold, add salt to taste Join Date: Dec 2002 Location: Raytown, Missouri Posts: 12,172	I'll see what I can do with my iPhone. Looks like a noble cause. __________________ Peas and Logic, Patrick "He felt that his whole life was some kind of dream and he sometimes wondered whose it was and whether they were enjoying it." Douglas Adams

01-21-2009, 07:53 AM	#8
Undertoad Sorry for my long posts Join Date: Jan 2001 Location: Valley Forge Natl Park Posts: 20,297	Wasn't that footer?

01-21-2009, 08:56 AM	#9
glatt waiting like a stalking Butler Join Date: Jul 2003 Location: Arlington, VA Posts: 11,820	Oh, maybe. But I was focusing on the weird digital time/motion capture aspect of it.

01-21-2009, 06:07 PM	#13
newtimer Hoodoo Guru Join Date: Apr 2008 Posts: 281	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.

01-21-2009, 06:31 PM	#14
Agent-G Candy is dandy, but liquor is quicker Join Date: Apr 2008 Location: Lake Tahoe, California Posts: 102	no, I have never tried this with my iphone, but I think I might try it now.

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