Finding Contour
contours,hierarchy=cv_findcontour(image,mode,method)
Input image -> must be np.ndarray
Contour retrieval mode 1->cv2.RETR_EXTERNAL 2-> cv2.RETR_LIST 3->cv2.RETR_CCOMP 4->cv2.RETR_TREE
Contour approximation method 1->cv2.CHAIN_APPROX_NONE 2->cv2.CHAIN_APPROX_SIMPLE 3->cv2.CHAIN_APPROX_TC89_L1
Returns Contours
Returns Hierarchy ->vector, containing information about the image topology
Finding Contour
This function is used to find the contours