I have a set of boundary points of an object.
I want to draw it using opencv as contour.
I have no idea that how to convert my points to contour representation.
To the same contour representation which is obtained by following call
contours,_ = cv2.findContours(image,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)
Any ideas?
Thanks
Advertisement
Answer
By looking at the format of the contours I would think something like this should be sufficient:
contours = [numpy.array([[1,1],[10,50],[50,50]], dtype=numpy.int32) , numpy.array([[99,99],[99,60],[60,99]], dtype=numpy.int32)]
This small program gives an running example:
import numpy import cv2 contours = [numpy.array([[1,1],[10,50],[50,50]], dtype=numpy.int32) , numpy.array([[99,99],[99,60],[60,99]], dtype=numpy.int32)] drawing = numpy.zeros([100, 100],numpy.uint8) for cnt in contours: cv2.drawContours(drawing,[cnt],0,(255,255,255),2) cv2.imshow('output',drawing) cv2.waitKey(0)