Contours Detection
Summary
Contours Detection with open cv example.
Detect contours around objects in an image.
import cv2
import numpy as np
import matplotlib.pyplot as plt
img = cv2.imread(file_path,0)
plt.figure(1)
plt.imshow(img,cmap='gray')
contours,hierarchy = cv2.findContours(img, cv2.RETR_CCOMP, cv2.CHAIN_APPROX_SIMPLE)
external_contours = np.ones(img.shape)
for i in range(len(contours)):
if hierarchy[0,i,3]==-1:
cv2.drawContours(external_contours, contours, i, 255,-1)
plt.figure(2)
plt.imshow(external_contours,cmap='gray')
internal_contours = np.ones(img.shape)
for i in range(len(contours)):
if hierarchy[0,i,3]!=-1:
cv2.drawContours(internal_contours, contours, i, 255,-1)
plt.figure(3)
plt.imshow(internal_contours,cmap='gray')
