Opencv learning note 4 - expansion / corrosion / open operation / close operation

1. corrosion

effect ： Depilation point

image1 = mpimg.imread('./11.png')
plt.imshow(image1);

kernel = np.ones((3, 3), np.uint8)
image2 = cv2.erode(image1, kernel, iterations = 1)
plt.imshow(image2)

2. inflation

The result of corrosion , As the input of inflation , It can make small things bigger .

kernel = np.ones((3, 3), np.uint8)
image3 = cv2.dilate(image2, kernel, iterations = 1)
plt.imshow(image3)

3. Open operation

Corrosion before expansion

image = mpimg.imread('11.png')
kernel = np.ones((3,3), np.uint8)
image1 = cv2.morphologyEx(image, cv2.MORPH_OPEN, kernel)
plt.imshow(image1);

4. Closed operation

Expand before corrode

image = mpimg.imread('11.png')
kernel = np.ones((3,3), np.uint8)
image1 = cv2.morphologyEx(image, cv2.MORPH_CLOSE, kernel)
plt.imshow(image1);