import cv2


def get_picture():
    cap = cv2.VideoCapture(0)
    ret, frame = cap.read()
    # 显示图像窗口在树莓派的屏幕上
    # cv2.imshow('Capture', frame)
    # 按下q键退出
    # key = cv2.waitKey(0)
    # print( '%08X' % (key&0xFFFFFFFF) )
    # 释放资源和关闭窗口
    cap.release()
    cv2.destroyAllWindows()
    return frame


if __name__ == '__main__':
    image = get_picture()
    cv2.imshow('Capture', image)
    # 按下q键退出
    key = cv2.waitKey(0)