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cv2.findContours() updated in newer versions #292

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2 changes: 1 addition & 1 deletion source/py_tutorials/py_imgproc/py_contours/py_contours_begin/py_contours_begin.rst
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Expand Up @@ -33,7 +33,7 @@ Let's see how to find contours of a binary image:
See, there are three arguments in **cv2.findContours()** function, first one is source image, second is contour retrieval mode, third is contour approximation method. And it outputs the image, contours and hierarchy. ``contours`` is a Python list of all the contours in the image. Each individual contour is a Numpy array of (x,y) coordinates of boundary points of the object.

.. note:: We will discuss second and third arguments and about hierarchy in details later. Until then, the values given to them in code sample will work fine for all images.

If you are using OpenCV version >=3.2, **cv2.findContours()** function returns only two arguments - ``contours`` and ``hierarchy``, it no longer makes any changes on the source image. So changing the code to use ``contours, hierarchy = cv2.findContours(thresh,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)`` should work.

How to draw the contours?
===========================
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