can't capture image by raspberry pi camera in python
I have a problem when trying to take an image with a Raspberry Pi camera.
When I execute this code:
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()
I get the error:
Traceback (most recent call last):
...
...
...
TypeError: 'NoneType' object is not subscriptable
I searched to solve this problem and found a command to enter in terminal:
sudo modprobe bcm2835-v4l2
It solves the problem momentarily, but it appears again after I restart the Raspberry Pi.
Please help me to solve this problem.
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