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Created September 11, 2019 15:34
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Smooth contours in Opencv
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contour_smooth.py
import numpy
import cv2
from scipy.interpolate import splprep, splev
smoothened = []
for contour in contours:
x,y = contour.T
# Convert from numpy arrays to normal arrays
x = x.tolist()[0]
y = y.tolist()[0]
# https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.interpolate.splprep.html
tck, u = splprep([x,y], u=None, s=1.0, per=1)
# https://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.linspace.html
u_new = numpy.linspace(u.min(), u.max(), 25)
# https://docs.scipy.org/doc/scipy-0.14.0/reference/generated/scipy.interpolate.splev.html
x_new, y_new = splev(u_new, tck, der=0)
# Convert it back to numpy format for opencv to be able to display it
res_array = [[[int(i[0]), int(i[1])]] for i in zip(x_new,y_new)]
smoothened.append(numpy.asarray(res_array, dtype=numpy.int32))
# Overlay the smoothed contours on the original image
cv2.drawContours(original_img, smoothened, -1, (255,255,255), 2)
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