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Correct barrel distortion without reference images


I want to correct a simple barrel distortion whithout using calibration images. In imagemagick-convert I just call e.g. convert img -distort Barrel "0.0 0.0 -0.1 1.0". This is sufficient for my camera. In OpenCV it seems to be much more complicated than this.

Is there any easy way comparable to imagemagick to do this simple distortion correction? I just want to avoid calling imagemagick from my python script since OpenCV should be able to do the entire job.

Thanks in advance.