Digital camera noise reduction idea

Discussion in 'Digital Photography' started by Viator, Dec 2, 2007.

  1. Viator

    Viator Guest

    I was curious if anyone has thought of the following way to
    reduce image noise, in particular noise that comes from an
    electromagnetic source i.e. not light. The idea is,
    just cover most of the camera with tinfoil, everything except
    the lens of course. By this method, the only signal noise
    that affects the analog sensor elements will be of either
    internal origin (the circuits) or optical.

    But will it work? I haven't tried it, since I temporarily don't
    have a digital camera.
    Viator, Dec 2, 2007
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  2. Viator

    Marra Guest

    It wont make any difference as the internal electronics are low
    impedance anyway.

    The noise is caused by the semiconductor material not outside
    Marra, Dec 3, 2007
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  3. Viator

    acl Guest

    Part of it is also inherent in the incoming signal (because at low
    enough levels the photon's discreteness is important).
    acl, Dec 3, 2007
  4. Viator

    Didi Guest

    No, it will not work. A tinfoil hat on the operators head
    might be a more useful idea, though...

    Didi, Dec 3, 2007
  5. Viator

    EAL Guest

    The noise comes from the sensor and the electronics, not from radio
    signals around you.

    You can reduce noise by cooling the camera. That reduces in the sensor
    and electronics. Don't cool below freezing, though, because then the
    battery will fail.

    EAL, Dec 3, 2007
  6. Viator

    Ron Hunter Guest

    I think your tinfoil helmet has slipped.
    Ron Hunter, Dec 3, 2007
  7. Viator

    Ron Hunter Guest

    It is true that even a small reduction in the temperature of the sensor
    can greatly lower noise. However, one runs into power problems (lithium
    batteries can help), and condensation problems when the camera is
    returned to room temperatures.
    Ron Hunter, Dec 3, 2007
  8. It would help if the tinfoil was very thick, say an inch, and deep
    frozen first before applying it to the camera half an hour before
    taking a photograph.
    Chris Malcolm, Dec 3, 2007
  9. Viator

    irwell Guest

    He could also mount a high powered phase cancellation oscillator
    on the camera.
    irwell, Dec 3, 2007
  10. Viator

    Viator Guest

    I appreciate your maturity.
    Viator, Dec 4, 2007
  11. Viator

    Viator Guest

    Dealing with quality people like you is the spice of life.
    Viator, Dec 4, 2007
  12. The "noise" does not come from external "signal noise", so shielding
    it will do nothing.

    David L. Jones, Dec 4, 2007
  13. Viator

    Ron Hunter Guest

    Thanks. When one asks such a question one should be open to some ridicule.
    It tends to promote rational thinking, and some research before posting.
    Ron Hunter, Dec 4, 2007
  14. Dealing with retarded ideas from clueless people is the leftover
    meatloaf of life.
    Oh, BTW *light* IS electromagnetic!
    a7yvm109gf5d1, Dec 4, 2007
  15. Viator

    Brian MW0GKX Guest

    Buy a decent camera. Mine already has an aluminium casing.
    Brian MW0GKX, Dec 5, 2007
  16. Viator

    Ron Hunter Guest

    Oh? I guess physics has changed in the 40 years or so since I last
    studied it. Seems to me, that at that time, light was made up of
    'photons', and was only in the 'electromagnetic spectrum' by virtue of
    wavelength considerations. VERY different from the flow of electrons,
    at least by the standards I studied. Has this changed?
    Ron Hunter, Dec 5, 2007
  17. Viator

    acl Guest

    No but there seems that there's some confusion here: light is
    precisely coupled undulations in the electric and magnetic fields.
    These are quantised, and the quantum is called the photon.

    The flow of electrons is another story. But it can be cast in the same
    terms. For that matter, sound waves in solids can be cast in the same
    form: there, you'd probably think of them as "waves", but in fact they
    can also be thought of as consisting of particles-phonons. And so on.
    acl, Dec 5, 2007
  18. Viator

    Ron Hunter Guest

    Well, since sound has the 'medium', of matter, and travels as motion of
    molecules (or atoms), it seems to obey much the same rules, but can't
    travel through a vacuum.
    Ron Hunter, Dec 5, 2007
  19. Viator

    acl Guest

    True, I was just commenting that switching between thinking of
    something as particles and as waves is done in many different
    contexts, not only for electromagnetic radiation. It just depends on
    how closely you look (like light: normally you're fine thinking of it
    as waves, but if you look too closely, it's sort of made up of
    discrete particles).

    That sound "quanta" are different from light quanta is also signified
    by the fact that they have a different name :)
    acl, Dec 5, 2007
  20. Hilarious from Mr "It tends to promote rational thinking, and some
    research before posting. "
    a7yvm109gf5d1, Dec 5, 2007
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