OpenCV Trackbar的動作偵測

woff

原始碼

1. import cv2
   
2. import  numpy as np
   
3. drawing=False
   
4. mode=True
   
5. ix,iy=-1,-1
   
6. def nothing(x):
   
7.     pass
   
8. def draw_circle(event,x,y,flags,param):
   
9.     s=0
   
10.     r=cv2.getTrackbarPos('R','image')
    
11.     g=cv2.getTrackbarPos('G','image')
    
12.     b=cv2.getTrackbarPos('B','image')
    
13.     color=(b,g,r)
    
14.     if s==1:
    
15.         color=(255,255,255)
    
16.     s=cv2.getTrackbarPos('eraser','image')
    
17.     thin=cv2.getTrackbarPos('thin','image')
    
18.     global  ix,iy,drawing,mode
    
19.     if event==cv2.EVENT_LBUTTONDOWN:
    
20.         drawing=True
    
21.         ix,iy=x,y
    
22.     elif event==cv2.EVENT_MOUSEMOVE and flags==cv2.EVENT_FLAG_LBUTTON:
    
23.         if drawing==True:
    
24.             if mode == True:
    
25.                 cv2.rectangle(img,(ix,iy),(x,y),color,-1)
    
26.             else:
    
27.                 cv2.circle(img,(x,y),thin,color,-1)
    
28.     elif event==cv2.EVENT_LBUTTONUP:
    
29.         drawing==False
    
30. 
    
31. img=np.zeros((440,440,3),np.uint8)
    
32. img[:]=255
    
33. cv2.namedWindow('image')
    
34. cv2.createTrackbar('R','image',0,255,nothing)
    
35. cv2.createTrackbar('G','image',0,255,nothing)
    
36. cv2.createTrackbar('B','image',0,255,nothing)
    
37. cv2.createTrackbar('eraser','image',0,1,nothing)
    
38. cv2.createTrackbar('thin','image',1,50,nothing)
    
39. cv2.setMouseCallback('image',draw_circle)
    
40. while True:
    
41.     cv2.imshow('image',img)
    
42.     k=cv2.waitKey()
    
43.     if k==ord('m'):
    
44.         mode=not mode
    
45.     elif k==27:
    
46.         break

複製代碼

• 視窗建立後會不斷的做訊息傳遞，所以Trackbar若改為nothing的函數，代表不做任何事情。
• setMouseCallback( )代表滑鼠相關的訊息偵測，呼叫draw_circle函數。

1. cv2.createTrackbar('R','image',0,255,nothing)
   
2. cv2.createTrackbar('G','image',0,255,nothing)
   
3. cv2.createTrackbar('B','image',0,255,nothing)
   
4. cv2.createTrackbar('eraser','image',0,1,nothing)
   
5. cv2.createTrackbar('thin','image',1,50,nothing)
   
6. cv2.setMouseCallback('image',draw_circle)

複製代碼

演示圖