1. Download our Official Android App: Forums for Android!

Weird scanline on camera picture

Discussion in 'Android Devices' started by apanbest, Oct 8, 2010.

  1. apanbest

    apanbest Lurker
    Thread Starter
    Rank:
    None
    Points:
    5
    Posts:
    5
    Joined:
    Feb 19, 2010

    Feb 19, 2010
    5
    0
    5
    got this 'scanline' like effect on every picture i snap. anybody know what can cause this?

    [​IMG]

    Uploaded with ImageShack.us
     

    Advertisement

  2. Jammy

    Jammy Android Expert
    Rank:
    None
    Points:
    113
    Posts:
    972
    Joined:
    May 29, 2010

    May 29, 2010
    972
    174
    113
    United Kingdom
    Try taking a picture with the battery cover off...
     
  3. Phenomenological

    Phenomenological Android Expert
    Rank:
    None
    Points:
    93
    Posts:
    782
    Joined:
    Jul 7, 2010

    Jul 7, 2010
    782
    186
    93
    You're indoors taking a picture in very low light. It's image noise caused by the camera increasing the ISO (Amplification of the electrical signals from the sensor) to compensate for the awful lighting. Try taking a picture outside in the daylight. They should go away. If not, it may be to do with the lens cover (Do what the poster above said to check this), or it could be a sensor issue. But the latter is unlikely.
     
  4. arkazain

    arkazain Well-Known Member
    Rank:
    None
    Points:
    56
    Posts:
    142
    Joined:
    Sep 1, 2010

    Sep 1, 2010
    142
    6
    56
    Yes, what the above poster said, try snapping a picture in a well-lit place.
     
  5. apanbest

    apanbest Lurker
    Thread Starter
    Rank:
    None
    Points:
    5
    Posts:
    5
    Joined:
    Feb 19, 2010

    Feb 19, 2010
    5
    0
    5
    thanks for the suggestion guys, will try to snap a picture outside tomorrow and see what happens.
     
  6. Rastaman-FB

    Rastaman-FB Android Expert
    Rank:
    None
    Points:
    313
    Posts:
    6,113
    Joined:
    Sep 11, 2009

    Sep 11, 2009
    6,113
    1,010
    313
    UK
    also it looks like iso 800?
    its a quick shutter so you get more grainy effect as its not having time to process all the colours
     
  7. No_u

    No_u Android Enthusiast
    Rank:
    None
    Points:
    63
    Posts:
    483
    Joined:
    Sep 4, 2010

    Sep 4, 2010
    483
    45
    63
    Or use your built in flash :D
     
  8. Phenomenological

    Phenomenological Android Expert
    Rank:
    None
    Points:
    93
    Posts:
    782
    Joined:
    Jul 7, 2010

    Jul 7, 2010
    782
    186
    93
    Don't get me started on the disadvantages of a flash that is effectively a point light source. :p Anyway, I'm kinda bored, so I'm going to give a quick crash course in camera sensors for anyone who really cares!

    There are three ways of controlling the brightness of the images your camera takes. Shutter speed, which is how long the sensor is activated for in this case (As there is no real shutter in a phone), aperture, which is how wide the opening in the lens is, and ISO. Aperture is fixed on phone cameras as far as I know, or is at least very limited, so you can't control that. So the phone is left with the ability to increase the shutter speed (Which allows more light to hit the sensor, but causes blur if the camera or subject moves), or increase the ISO. Given the choice, it does the latter, so the photo doesn't become blurry and unusable.

    The grain you see in the image comes about due to the higher ISO. Effectively, the sensor operates exactly the same way every time you take a picture. You cannot physically change the sensor. But integrated into the sensor are a series of amplifiers, that take the signals from the individual sensor elements and increase their power. This allows the camera to 'see' a brighter image than the sensor actually generates, in much the same way as a megaphone amplifies your voice.

    However, in all images captured by a camera there is an artefact called noise. This is caused by the electronics inside the sensor and camera (The constantly changing currents generate magnetic fields that induce currents in nearby components). It's similar to (But not the same as) the phenomenon that gives you white noise on your TV if it isn't tuned, or static on your radio - Random signals being picked up. And these random signals are amplified along with the signals from the sensor. Therefore, the higher the ISO, the more the noise is magnified, and the more grainy your image becomes.

    The only real way to get around this is to physically move the elements in the sensor further apart, which is one of the reasons why professional cameras have much larger sensors than those in phone cameras, as well as larger lenses to gather more light. Thus, in the world of photography, bigger is ALWAYS better. ;)
     
Tags:

Share This Page

Loading...