February 18, 2010
Roll Cameras!
PlayThis one from Rogi 
keeps the GQ marathon running
What’s the cause of the anomalies pictured?
Hint: They happen only in specific type of cameras
Cracked by: udupendra , Gurupad , Logik , Rogi , Raghuvansh , Dibyo , Rahulk , sidsen and shenoyvarun86
Nice crack, people!
Answer:
Quoting Rogi
Aliasing or slit-scanning caused by a rolling (non-global) CMOS shutter used in cheap cameras like the iPhone
In simple terms, if a sensor is read slower than the rate of change of the image formed on it, you get these artifacts. specially when taking pics of propellers because it would have moved by the time the sensor reads the contents on the scene.
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this->bb();
February 19th, 2010 at 4:25 am, GMT +0000 ( 1266553509 )
Happen in DSLR cameras due to sensor being read out at slower speeds than the propeller’s movement
February 19th, 2010 at 5:06 am, GMT +0000 ( 1266556016 )
Airplane Prop + CMOS Rolling Shutter
February 19th, 2010 at 6:06 am, GMT +0000 ( 1266559561 )
Mobile phone camera often use progressive scanning of data, by sequentially transferring data from the sensor, line by line.
So a moving object renders as a split image, like in this case.
‘Focal plane shutter artifact in digital cameras’.
February 19th, 2010 at 8:20 am, GMT +0000 ( 1266567636 )
Aliasing or slit-scanning caused by a rolling (non-global) CMOS shutter used in cheap cameras like the iPhone.
February 19th, 2010 at 5:44 pm, GMT +0000 ( 1266601496 )
The camera on an iPhone doesn’t capture images like a normal camera. It does a sideways scan – like on a computer scanner or photocopier. Therefore.
February 19th, 2010 at 6:12 pm, GMT +0000 ( 1266603179 )
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
February 19th, 2010 at 11:13 pm, GMT +0000 ( 1266621205 )
hjouhi
February 19th, 2010 at 11:16 pm, GMT +0000 ( 1266621394 )
Photon Gating by iPhone due to missing physical shutter
February 19th, 2010 at 11:27 pm, GMT +0000 ( 1266622023 )
lovely question – this happens in cameras which use a top down sensing mode. basically picks up the picture like a scanner would and consequently has photos at differing moments in time at different parts of the sensor screen.
February 20th, 2010 at 7:27 am, GMT +0000 ( 1266650824 )
IN DSLR cameras due to sensor being read out at slower speeds
http://chdk.wikia.com/wiki/Tal.....Flash-Sync
I did not undertand anything though :):)