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This repo contains tutorials on OpenCV-Python library using new cv2 interface

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The given link is not working. So it is better to remove it.

Hi everyone, I would love to contribute to this project, however I am not sure if maintainers are still active here ... 🤔 Would appreciate your answer.

small corrections to the mean error computation: - added parenthesis - changed xrange to range for Python 3 compatibility - total_error is undefined

Edited some texts and added some missing texts so that reader can easily understand about the documentation.

There is a parameter called `lines` in between `threshold` and `minLineLength`. Without specifying the parameter name will cause cv2.HoughLinesP() to take the wrong positional parameter. Docstring: `HoughLinesP(image, rho, theta, threshold[,...

![image](https://user-images.githubusercontent.com/43515926/108447654-359e5b80-729b-11eb-813c-00958cff358f.png)

- I believe that the `tot_error` has to be replaced by `mean_error` in this tutorial, and the `print` function might print: `print("Mean Projection Error: ", mean_error/len(objpoints))` - see the [link](https://github.com/abidrahmank/OpenCV2-Python-Tutorials/blob/master/source/py_tutorials/py_calib3d/py_calibration/py_calibration.rst)