Python OpenCV select 播放时 video/stream 的投资回报率

Question

感谢是否有人可以在播放视频流时帮助 select 获得 ROI（不希望它暂停或捕获第一帧）我是不是遗漏了什么，我试过将框架设置为同名

cv2.selectROI('Frame', frame, False)
cv2.imshow('Frame',frame)

谢谢

Answer 1

在那种情况下你不能使用 cv2.selectROI() 因为函数是阻塞的，即它会停止你的程序的执行，直到你选择了你感兴趣的区域（或取消它）。

要实现您想要的效果，您需要自己处理 ROI 的选择。这是一个简短的示例，说明如何执行此操作，使用两次左键单击来定义 ROI，然后单击右键将其擦除。

import cv2, sys

cap = cv2.VideoCapture(sys.argv[1])
cv2.namedWindow('Frame', cv2.WINDOW_NORMAL)

# Our ROI, defined by two points
p1, p2 = None, None
state = 0

# Called every time a mouse event happen
def on_mouse(event, x, y, flags, userdata):
    global state, p1, p2
    
    # Left click
    if event == cv2.EVENT_LBUTTONUP:
        # Select first point
        if state == 0:
            p1 = (x,y)
            state += 1
        # Select second point
        elif state == 1:
            p2 = (x,y)
            state += 1
    # Right click (erase current ROI)
    if event == cv2.EVENT_RBUTTONUP:
        p1, p2 = None, None
        state = 0

# Register the mouse callback
cv2.setMouseCallback('Frame', on_mouse)

while cap.isOpened():
    val, frame = cap.read()
    
    # If a ROI is selected, draw it
    if state > 1:
        cv2.rectangle(frame, p1, p2, (255, 0, 0), 10)
    # Show image
    cv2.imshow('Frame', frame)
    
    # Let OpenCV manage window events
    key = cv2.waitKey(50)
    # If ESCAPE key pressed, stop
    if key == 27:
        cap.release()

Python OpenCV select 播放时 video/stream 的投资回报率

Python OpenCV select ROI on video/stream while its playing

python

opencv