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added the note about 1-pixel border in findContours (relates to ticket #2362)

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Vadim Pisarevsky 2012-10-01 16:43:07 +04:00
parent a4adf57edc
commit 57d9699058
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modules/imgproc/doc/structural_analysis_and_shape_descriptors.rst
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@ -162,7 +162,7 @@ Finds contours in a binary image.
The function retrieves contours from the binary image using the algorithm
[Suzuki85]_. The contours are a useful tool for shape analysis and object detection and recognition. See ``squares.c`` in the OpenCV sample directory.
.. note:: Source ``image`` is modified by this function.
.. note:: Source ``image`` is modified by this function. Also, the function does not take into account 1-pixel border of the image (it's filled with 0's and used for neighbor analysis in the algorithm), therefore the contours touching the image border will be clipped.
.. note:: If you use the new Python interface then the ``CV_`` prefix has to be omitted in contour retrieval mode and contour approximation method parameters (for example, use ``cv2.RETR_LIST`` and ``cv2.CHAIN_APPROX_NONE`` parameters). If you use the old Python interface then these parameters have the ``CV_`` prefix (for example, use ``cv.CV_RETR_LIST`` and ``cv.CV_CHAIN_APPROX_NONE``).