Hi at all,
before explaining my problem, I feeling really stupid about asking such an "easy" question, but I searched the Internet for about three hours without any result.
I have a running version of OpenCV 3.1.0 installed on my Raspberry Pi (Linux Raspbian, Python 3) since September this year, used: http://www.pyimagesearch.com/2016/04/18/install-guide-raspberry-pi-3-raspbian-jessie-opencv-3/
cv2.__version__ says 3.1.0
In 2015 there was a bug according to the fisheye-calibration and in April 2016 a fix was officially committed on GitHub: https://github.com/opencv/opencv/pull/6454/commits
Now, I want to re-download changed files and rebuild OpenCV to take advantage of the bug-fix (if this is the right way to handle an update). Another question is why I could download a bug-file after there was a fix half a year ago.
As I said, I was seeking for an answer for hours, but "update open cv linux" or "git update rebuild open cv" results in lots of crap.
Thank you all in advance!