region_of_interest issue with fillPoly() about carnd-lanelines-p1 HOT 6 CLOSED

Actually, it wants a numpy array of (arrays of) 32 bit integers, so it's more like:

cv2.fillPoly(mask, np.array([vertices], dtype=np.int32), ignore_mask_color)

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Yep, the second argument is an array of array of points. The cpp interface has a proxy object called InputArrayOfArray.

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The way this is demonstrated in the classroom quiz includes vertices as being an array of shapes already - vertices = np.array([[(0,imshape[0]),(0, 0), (imshape[1], 0), (imshape[1],imshape[0])]], dtype=np.int32) (this is before tuning :) ). I think it may be more confusing to change this within the notebook, as the vertices themselves are already supposed to be in an array.

What are your thoughts? Perhaps just editing the docstring to mention that vertices is an array of integer points might solve it.

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this should make a pull request

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udacity/sdc-issue-reports#577

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Updated the docstring to clarify this further.

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