FAQ
For my calculations i need the local length in pixels(opencv format).
The andriod API getFocusDistances(float[])<http://developer.android.com/reference/android/hardware/Camera.Parameters.html#getFocusDistances(float[])>
  give me the focal length in mm.
I try to convert from mm to pixels

In opencv exists the function cv::CalibrationMatrixValues that convert from
pixels to mm. I want to do the inverse conversation (based on the
function's source code). But i can't understand the apertureWidth and
apertureHeight parameters.

Can someone help me?


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