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February 18, 2010

Roll Cameras!

devadutta @ 11:59 pm, GMT +0000 ( 1266537570 ) Play

This 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.


10 Responses to “Roll Cameras!”

  1. udupendra
    4
    4
    7

    Happen in DSLR cameras due to sensor being read out at slower speeds than the propeller’s movement


  2. Airplane Prop + CMOS Rolling Shutter


  3. Logik
    1
    5
    3

    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’.


  4. Rogi
    48
    10
    5

    Aliasing or slit-scanning caused by a rolling (non-global) CMOS shutter used in cheap cameras like the iPhone.


  5. Raghuvansh
    1
    9
    4

    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.


  6. Dibyo
    11
    14
    10

    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


  7. rahulk
    2
    5

    hjouhi


  8. Rahulk
    2
    5

    Photon Gating by iPhone due to missing physical shutter


  9. sidsen
    2

    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.


  10. 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 :):)


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