Revision history [back]

Hello!

I have a question and a problem, which I'm putting together, since they are possibly related.

First the problem. I am calibrating a wide-angle IP Cam. Here as an example of the image after calling remap() with the calibration data:

Lines are straight. Good. However, notice that the checkboard squares are tall. They are rectangles instead of squares. Bad. Should the calibration process have made this good? How do I correct for this?

When performing the calibration (for the example posted), I am not using the CALIB_FIX_ASPECT_RATIO flag. However, I have tried it with the flag (using it correctly as per the sample) and end up with the same problem. I understand that this flag indicates that there is a known pixel-size-ratio, but if I don't provide the flag, I assumed that this would have been calculated, right?

Hello!

I have a question and a problem, which I'm putting together, since they are possibly related.

First the problem. I am calibrating a wide-angle IP Cam. Here as an example of the image after calling remap() with the calibration data:

Lines are straight. Good. However, notice that the checkboard squares are tall. They are rectangles instead of squares. Bad. Should the calibration process have made this good? How do I correct for this?

When performing the calibration (for the example posted), I am not using the CALIB_FIX_ASPECT_RATIO flag. However, I have tried it with the flag (using it correctly as per the sample) and end up with the same problem. I understand that this flag indicates that there is a known pixel-size-ratio, but if I don't provide the flag, I assumed that this would have been calculated, right?

Hello!

I am calibrating a wide-angle IP Cam. Here as an example of the image after calling remap() with the calibration data:

Lines are straight. Good. However, notice that the checkboard squares are tall. They are rectangles instead of squares. Bad. Should the calibration process have made this good? How do I correct for this?

When performing the calibration (for the example posted), I am not using the CALIB_FIX_ASPECT_RATIO flag. However, I have tried it with the flag (using it correctly as per the sample) and end up with the same problem. I understand that this flag indicates that there is a known pixel-size-ratio, but if I don't provide the flag, I assumed that this would have been calculated, right?