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The sanity check prevents Python 2 from calling findContours, because the Python 2 bindings pass an empty matrix for `_contours`. If `_contours` is not empty, the channel and depth check should determine whether the matrix is of the correct type and size. Note: the Python 2 bindings passes a matrix of type `STD_VECTOR_MAT` to parameters of the type `OutputArrayOfArrays`.
OpenCV: Open Source Computer Vision Library
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