If I have an object of some size and spectral radiance, and it's some distance R from a camera, how would I calculate its digital count value in an image? I'm sure there's an equation out there, but I don't know what to search for. It would be a function of integration time, aperture, focal length, gain, quantum efficiency, point-spread function, spatial resolution, etc. For simplicity, I'd assume the noise is Gaussian, and that atmospheric transmission is perfect.

Can someone please help?

  • 2
    $\begingroup$ What do you mean by "pixel intensity" and "digital count?" $\endgroup$ Feb 11 at 15:56
  • $\begingroup$ I mean the intensity of the pixel when I take a picture with a digital camera and view the picture electronically. $\endgroup$ Feb 11 at 16:31

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