[python-opencv entry notes] 9 - Morphological operations: open operation, closed operation

1、開運算

先腐蝕後膨脹的操作稱為開運算

The role of open operation：消除細小物體、在窄區域分離物體、平滑大物體邊界等.

Open operation function： cv2.morphologyEx(圖像, cv2.MORPH_OPEN,矩陣)

• cv2.MORPH_OPEN 是常量,Means open operation

示例代碼：

import cv2
import numpy as np
img = cv2.imread("./k.jpg")
k = np.ones((20, 20), np.uint8)
k_img = cv2.morphologyEx(img, cv2.MORPH_OPEN,k)
cv2.imshow("img", img)
cv2.imshow("k_img", k_img)
cv2.waitKey()

運行結果：

原圖

After opening operation：

2、閉運算

先膨脹後腐蝕的操作稱為閉運算
作用：填充物體空洞、消除噪聲、連接鄰近物體、平滑邊界等.

closed operation function： cv2.morphologyEx(圖像, cv2.MORPH_CLOSE,矩陣)

• cv2.MORPH_CLOSE 是常量,Means closed operation

import cv2
import numpy as np
img = cv2.imread("./csdnb.jpg")
k1 = np.ones((8, 8), np.uint8)
k2 = np.ones((15, 15), np.uint8)
k3 = np.ones((22, 22), np.uint8)
k1_img = cv2.morphologyEx(img, cv2.MORPH_CLOSE, k1)
k2_img = cv2.morphologyEx(img, cv2.MORPH_CLOSE, k2)
k3_img = cv2.morphologyEx(img, cv2.MORPH_CLOSE, k3)
cv2.imshow("img", img)
cv2.imshow("k1_img", k1_img)
cv2.imshow("k2_img", k2_img)
cv2.imshow("k3_img", k3_img)
cv2.waitKey()

運行結果：

原圖

k1:

k2:

k3: