cv2 python 多线程调用摄像头_Python中的多线程cv2.imshow（）可以

实现多线程调用摄像头并显示的功能。具体实现方法如下：

1. 导入必要的库

import cv2
import threading

2. 定义摄像头读取线程

class CameraThread(threading.Thread):
    def __init__(self, camera_id):
        threading.Thread.__init__(self)
        self.camera = cv2.VideoCapture(camera_id)
        self.frame = None
        self.running = True

    def run(self):
        while self.running:
            ret, frame = self.camera.read()
            if ret:
                self.frame = frame

        self.camera.release()

    def stop(self):
        self.running = False

3. 定义显示线程

class DisplayThread(threading.Thread):
    def __init__(self, name, frame):
        threading.Thread.__init__(self)
        self.name = name
        self.frame = frame
        self.running = True

    def run(self):
        cv2.namedWindow(self.name, cv2.WINDOW_NORMAL)

        while self.running:
            if self.frame is not None:
                cv2.imshow(self.name, self.frame)

            if cv2.waitKey(1) & 0xFF == ord('q'):
                self.running = False

        cv2.destroyAllWindows()

    def stop(self):
        self.running = False

4. 创建摄像头读取线程和显示线程并启动

camera_thread = CameraThread(0)
display_thread = DisplayThread('Camera', camera_thread.frame)

camera_thread.start()
display_thread.start()

camera_thread.join()
display_thread.stop()
display_thread.join()

5. 最后别忘了在程序结束时释放摄像头资源

cv2.destroyAllWindows()
camera_thread.stop()

这样就可以实现多线程调用摄像头并显示的功能了。