PROSAGA码农传奇-模式识别-Python：在图像上绘制两个区域

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  <P>
    以下脚本可用于使用鼠标选择图像的区域（如.gif中所示）。
    <a href="https://i.stack.imgur.com/in1vF.gif" rel="nofollow noreferrer">
      <img src =“https://i.stack.imgur.com/in1vF.gif”alt =“gif显示区域选择”/>
    </A>
  </p>
   <pre>
    <code>
      import cv2, numpy as np

# Mouse callback function
global click_list
positions, click_list, shapes = [(0,0)], [], []
def callback(event, x, y, flags, param):
    positions[-1] = (x,y)
    if event == 1: click_list.append((x,y))
cv2.namedWindow('img')
cv2.setMouseCallback('img', callback)

# Mainloop - show the image and collect the data
while True:
    # Create a blank image
    img = np.zeros((600,600,3), np.uint8)
    # Try to draw the shape being collected
    for idx in range(len(click_list)-1):
        cv2.line(img, click_list[idx], click_list[idx+1], (0,255,0), 5)
    # Draw the stored shapes
    for shape in shapes:
        for idx in range(len(shape)):
            cv2.line(img, shape[idx], shape[idx-1], 255, 5)
    # Show the image
    cv2.imshow('img', img)    
    # Wait, and allow the user to quit with the 'esc' key
    k = cv2.waitKey(1)
    # If user presses 's', go on to the next shape
    if k == 115:
        shapes.append(click_list)
        click_list = []
    # If user presses 'esc' break 
    if k == 27: break
# Clean up
cv2.destroyAllWindows()

</code>
  </pre>
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