在python中无法通过树莓派相机捕捉图像

尝试使用Raspberry Pi相机拍摄图像时出现问题。

当我执行此代码时:

import sys

sys.path.append('/usr/local/lib/python3.4/site-packages')
import cv2
import numpy as np
import detect
cap = cv2.VideoCapture(0)

while(True):
    ret, frame = cap.read()
    img = detect.detect(frame)

    cv2.imshow('frame',img)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()

我收到错误:

Traceback (most recent call last):
...
...
...
TypeError: 'NoneType' object is not subscriptable

我搜索解决这个问题,并找到一个命令进入终端:

sudo modprobe bcm2835-v4l2

它暂时解决了问题,但是在重新启动Raspberry Pi之后再次出现。

请帮我解决这个问题。


编辑文件/etc/modules (以root身份)并添加bcm2835-vl42行,如下所示:

# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.


# v4l2 added for OpenCV video capture
bcm2835-v4l2
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