My task today is to build an environment for graduation design on Raspberry Pi, such as opencv
Raspberry Pi ready to boot
First burn the Raspberry Pi system
Put the blank ssh file into the boot disk of the SD card
Manually create a blank Notepad .txt file, name it ssh, rename it, and delete the .txt extension. Put this file into the boot disk of the SD card.
Configure the wifi file and put it into the boot disk of the SD card
Use the same method to create a new blank file wpa_supplicant.conf (note to delete the extension .txt)
Open wpa_supplicant.conf with a text editor and enter the following configuration, you can use multiple network{} to configure multiple wifi:
country=GB
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="将我替换成第一个WiFi的名字，不删除引号,不能有中文"
psk="将我替换成WiFi密码，不删除引号"
priority=将我替换成数字，数字越大代表优先级越高
}
network={
ssid="将我替换成第二个WiFi的名字，不删除引号,不能有中文"
psk="将我替换成WiFi密码，不删除引号"
priority=将我替换成数字，数字越大代表优先级越高
}
country=GB
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
network={
ssid="dyk"
psk="dyk159357"
priority=5
}
network={
ssid="FAST_55555"
psk="dyk159357"
priority=2
}
get raspberry pi ip
Change the source of the Raspberry Pi
The default download speed is very slow, so we need to replace the domestic source ourselves
Edit the /etc/apt/sources.list file
sudo vim /etc/apt/sources.list
Use # to comment out the content of the original file and replace it with the following
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib rpi
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib rpi
Edit the /etc/apt/sources.list.d/raspi.list file
sudo vim /etc/apt/sources.list.d/raspi.list
Use # to comment out the content of the original file and replace it with the following
deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
After replacing the source, run the following two commands
sudo apt-get update
sudo apt-get upgrade
This command will visit each URL in the source list, read the software list, and save it locally on the Raspberry Pi.
The above steps realized that Respbian's package manager apt-get changed the source to the Tsinghua University software mirror site, and updated the software list. In the future, when executing sudo apt-get install on the Raspberry Pi command line, the software name will be automatically downloaded from Tsinghua University. Open source software mirror site high-speed download
Change the source of pip
Configure the source change script
This method is effective for pro-testing on Raspberry Pi
Enter and run the following three commands in sequence on the command line of the Raspberry Pi
sudo mkdir ~/.pip
cd .pip
sudo chmod 777 pip.conf
sudo vim pip.conf
Enter the following into the open file:
[global]
timeout = 10
index-url = http://mirrors.aliyun.com/pypi/simple/
extra-index-url= http://pypi.douban.com/simple/
[install]
trusted-host=
mirrors.aliyun.com
pypi.douban.com
Install Remote Desktop
sudo apt-get install xrdp
install opencv
I didn't choose to compile and install here. It's a waste of time, although it's not very clear the difference between compiling and installing and not compiling and installing.
Install dependencies
Please execute the following commands one by one:
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install libhdf5-dev libhdf5-serial-dev
sudo apt-get install libqtgui4 libqtwebkit4 libqt4-test python3-pyqt5
sudo apt-get install libatlas-base-dev
sudo apt-get install libjasper-dev
Then execute
sudo pip3 install --no-cache-dir opencv-contrib-python==3.4.3.18
Test for successful installation
Run the following commands in sequence: sudo python3 >>> import cv2 >>> print(cv2.version) If the installation version can be output normally, the installation is successful.
import cv2 # 导入库
cap = cv2.VideoCapture(0) # 开启摄像头
# 循环读取图像
while True:
ok, img = cap.read() # 读取摄像头图像
if ok is False:
print('无法读取到摄像头！')
break
# 展示图像
cv2.imshow('image', img)
k = cv2.waitKey(10) # 键盘值
if k == 27: # 通过esc键退出摄像
break
# 关闭摄像头
cap.release()
cv2.destroyAllWindows()
Install on Raspberry Pi
Big guy blog link
Thanks to this blog, I installed and reinstalled the Raspberry Pi system twice
To re-replace the source of pip or you can't download it
[global]
timeout = 6000
index-url = http://mirrors.aliyun.com/pypi/simple/
extra-index-url=https://www.piwheels.org/simple/
[install]
use-mirrors = true
mirrors = http://mirrors.aliyun.com/pypi/simple/
trusted-host = mirrors.aliyun.com
some necessary environment
sudo apt-get install libhdf5-dev -y
sudo apt-get install libatlas-base-dev -y
sudo apt-get install libjasper-dev -y
sudo apt-get install libqt4-test -y
sudo apt-get install libqtgui4 -y
sudo apt-get install libatlas-base-dev -y
pip install
python3 -m pip install hyperlpr
Running the official website code directly will report the following error
pip3 install opencv-python==3.4.6.27
ImportError: libcblas.so.3: cannot open shared object file: No such file or directory
Because the latest version of opencv is not compatible with Raspberry Pi, it is necessary to roll back the version and install the environment that opencv depends on to run.
reinstall opencv
pip3 install opencv-python==3.4.6.27
test code
#导入包
from hyperlpr import *
#导入OpenCV库
import cv2
#读入图片
image = cv2.imread("car3.jpg")
#识别结果
print(HyperLPR_plate_recognition(image))
Ok, the environment is also very troublesome to set up, here is a record hahaha a little excited