Python cv2 輪廓描繪處理

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原圖：



完整代碼

1. import cv2
   
2. image = cv2.imread('coins2.png')
   
3. image = cv2.cvtColor(image,cv2.COLOR_BGR2RGB)
   
4. cv2.imshow('Original',image)
   
5. cv2.imwrite('coin1_Original.png', image)
   
6. print(image.shape)
   
7. gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
   
8. cv2.imshow('gray',gray)
   
9. cv2.imwrite('coin1_gray.png',gray)
   
10. cv2.waitKey()

複製代碼

1. import cv2,coin1
   
2. gray = coin1.gray
   
3. image = coin1.image
   
4. print('高斯模糊處理')
   
5. blurred = cv2.GaussianBlur(gray,(13,13),0) # 高斯模糊的目的是把雜訊過濾掉
   
6. cv2.imshow('blurred',blurred)
   
7. cv2.imwrite('coin2_GaussianBlur.png', blurred)
   
8. print('高斯模糊的目的是把雜訊過濾掉')
   
9. print('邊緣偵測，邊緣偵測不代表輪廓處理')
   
10. edged = cv2.Canny(blurred, 30, 150)
    
11. cv2.imshow('Canny',edged)
    
12. cv2.imwrite('coin2_Canny.png', edged)
    
13. cv2.waitKey()

複製代碼

1. import cv2,coin_2
   
2. gray = coin_2.gray
   
3. image = coin_2.image
   
4. blueeed = coin_2.blurred
   
5. edged = coin_2.edged
   
6. #edged2 = coins_2.edged2
   
7. print('輪廓處理')
   
8. contours , hierarchy = cv2.findContours(
   
9.     edged.copy(),cv2.RETR_EXTERNAL,
   
10.     cv2.CHAIN_APPROX_SIMPLE
    
11. )
    
12. print('count1:',len(contours))
    
13. 
    
14. # contours , hierarchy = cv2.findContours(
    
15. #     edged2.copy(),cv2.RETR_EXTERNAL,
    
16. #     cv2.CHAIN_APPROX_SIMPLE
    
17. # )
    
18. print('count2:',len(contours))
    
19. print('contours:',contours)
    
20. print('hierarchy:',hierarchy)
    
21. coins = image.copy()
    
22. cv2.drawContours(coins, contours,-1,(0,255,0),1)
    
23. cv2.imshow('coins',coins)
    
24. cv2.waitKey()

複製代碼

灰階圖



高斯模糊圖



Canny圖


輪廓描繪圖


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