Conversation focal distance from mm to pixels

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androidcamerafocallengthopencv

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Aleksey Odinochenko

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Jul 19, 2013, 2:51:27 AM7/19/13

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For my calculations i need the local length in pixels(opencv format).

The andriod API 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.