Question

我正在使用连接到raspberrypi3B +的两个摄像头进行图像处理。我收到一个错误“选择时间错误” .... enter image description here

from collections import deque
import numpy as np
import argparse
import imutils
import cv2
import time
from multiprocessing import Process, Queue

class opencv:
    def __init__(self):
        self.FrameWidth = 640           
        self.FrameHeight = 480          

    def rescale_frame(self, frame, percent=75):
        width = int(frame.shape[1] * percent/ 100)
        height = int(frame.shape[0] * percent/ 100)
        dim = (width, height)
        return cv2.resize(frame, dim, interpolation =cv2.INTER_AREA),width,height

    def cam(self, video):
        camera = cv2.VideoCapture(video)
        camera.set(3, self.FrameWidth)
        camera.set(4, self.FrameHeight)
        while True:
            (grab, frame) = camera.read()
            frame,width,height = self.rescale_frame(frame, percent= 30)             # pixcel 50% 
            cv2.circle(frame, (round(width/2), round(height/2)), 1, (0, 255, 255), 3)
            cv2.imshow("Frame", frame)
            key = cv2.waitKey(60) & 0xFF
            if (key == 27):
                break
            if (key == ord('i')):
                while True:
                    cv2.imshow("Frame", frame)
                    cv2.waitKey(0)
                    if key == ord('i'):
                        break

        camera.release()
        cv2.destroyAllWindows()

if __name__ == "__main__":
    cam0 = opencv()
    cam1 = opencv()
    p1 = Process(target = cam0.cam, args = (0,))
    p2 = Process(target = cam1.cam, args = (1,))
    p1.start()
    p2.start()

出什么问题了？电源问题？（我正在使用usb-hub向网络摄像头供电。）我尝试使用Pi-cam和网络摄像头运行相同的代码，并且可以正常工作，但我更喜欢使用网络摄像头，而不是Pi-cam（当时Pi-cam性能不不太好

在Raspberry PI3 +上使用两个网络摄像头，错误“选择超时”

0 个答案: