Raspberry pie 4B installation opencv3.4.0

This thing is difficult for thieves to install , I pretended for two days ,make If you fail once, you have to start all over again ....

First of all, let me explain that this is ： The raspberry pie installation runs on Python3 Upper OpenCV

Get to the point ：

Installation premise ：

1、 Configured with raspberry pie Raspbian operating system

2. Switch to domestic apt-get Download source and pip Download source , Prevent download speed from being too slow （ I won't go into details here , Please Baidu ）

install opencv

1、 install numpy

install Python Scientific Computing Library numpy（ Get administrator permission first ,su）

pip3 install numpy

2、 Expand the root directory to the whole... In the raspberry pie setting SD card

Command line interface input command , Enter the raspberry pie configuration interface . Use the up and down keys and the left and right keys to switch the cursor position .

raspi-config

Select the seventh row ：Advanced Options

Choose the first Expand Filesystem, Expand the root directory to this SD card . If you don't take this step , Subsequent commands will get stuck .

Exit the setup screen , Restart raspberry pie （reboot）.

3、 install OpenCV Required Library

Eight orders , Run one by one , The penultimate one needs four dev

sudo apt-get install build-essential git cmake pkg-config -y
sudo apt-get install libjpeg8-dev -y
sudo apt-get install libtiff5-dev -y
sudo apt-get install libjasper-dev -y
sudo apt-get install libpng12-dev -y

sudo apt-get install libavcodec-dev libavformat-dev libswscale-dev libv4l-dev -y

sudo apt-get install libgtk2.0-dev -y
sudo apt-get install libatlas-base-dev gfortran -y

4、 download OpenCV

Download two compressed packages to raspberry pie **/home/pi/Downloads** Under the table of contents （ It's best to download to this place , The follow-up is convenient ）

First switch to Downloads Under the table of contents ,（ It depends on your own situation , Not necessarily the path I wrote below ）

cd /home/pi/Downloads

use wget download

wget https://github.com/Itseez/opencv/archive/3.4.0.zip

wget https://github.com/Itseez/opencv_contrib/archive/3.4.0.zip

If visit GitHub Some difficulties , Take care of yourself （ There is a link at the end of the article ）.

Once the download is complete , Unzip to downloads Folder

unzip opencv-3.4.0.zip
unzip opencv_contrib-3.4.0.zip

5、 Set compilation parameters

cd /home/pi/Downloads/opencv-3.4.0
mkdir build
cd build

Set up CMAKE Parameters , It's a little long , About ten minutes , Here is a whole sentence , Don't forget to copy the last two points

cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_C_EXAMPLES=ON -D INSTALL_PYTHON_EXAMPLES=ON -D OPENCV_EXTRA_MODULES_PATH=/home/pi/Downloads/opencv_contrib-3.4.0/modules -D BUILD_EXAMPLES=ON -D WITH_LIBV4L=ON PYTHON3_EXECUTABLE=/usr/bin/python3.5 PYTHON_INCLUDE_DIR=/usr/include/python3.5 PYTHON_LIBRARY=/usr/lib/arm-linux-gnueabihf/libpython3.5m.so PYTHON3_NUMPY_INCLUDE_DIRS=/home/pi/.local/lib/python3.5/site-packages/numpy/core/include ..

After the execution is completed, the following figure shows success

6、 compile （ The one with the most moths and the most time-consuming ）

First of all, you should have enough storage space ,5g above , It's better not to use it ssh Connect the raspberry pie , A span ssh Will automatically exit , Cause you don't know make Is it over . It is best to vnc Connect , You can also connect raspberries to the monitor .

cd /home/pi/Downloads/opencv-3.4.0/build
make

Raspberry pie 4b,4g Running memory , I ran for about four hours , And there are many thieves in the middle of something wrong . Let me summarize my

1、 Missing file type error

Report errors ：Built target opencv_tracking [Makefile:163 : all] error 2, It means lack boostdesc_bgm.i,boostdesc_bgm_bi.i Wait for these documents

Because the downloaded installation package files are incomplete , Copy the missing files to ：home/pi/Downloads/opencv_contrib-3.4.3/modules/xfeatures2d/src/ Then you can

Documents needed , I'll finally give you a link .

2、 Type of path error

Report errors ：fatal error: opencv2/xfeatures2d/cuda.hpp: There is no file or directory .

Building CXX object modules/stitching/CMakeFiles/opencv_stitching_pch_dephelp.dir/opencv_stitching_pch_dephelp.cxx.o
In file included from /home/pi/opencv-3.4.0/build/modules/stitching/opencv_stitching_pch_dephelp.cxx:1:
/home/pi/opencv-3.4.0/modules/stitching/src/precomp.hpp:91:12: fatal error: opencv2/xfeatures2d/cuda.hpp:  There is no file or directory 

include “opencv2/xfeatures2d/cuda.hpp”
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [modules/stitching/CMakeFiles/opencv_stitching_pch_dephelp.dir/build.make:63：modules/stitching/CMakeFiles/opencv_stitching_pch_dephelp.dir/opencv_stitching_pch_dephelp.cxx.o]  error  1
make[1]: *** [CMakeFiles/Makefile2:21443：modules/stitching/CMakeFiles/opencv_stitching_pch_dephelp.dir/all]  error  2
make: *** [Makefile:163：all]  error  2

This is a type , There will be all kinds of mistakes , such as cuda.hpp,xfeatures2d.hpp,nonfree.hpp Wait, several documents , All wrong “ There is no file or directory ”.

This is the difference between absolute path and relative path , The system defaults to the relative path , We just need to find the wrong file , Find the wrong line , Put the relative path , Change to an absolute path .

for example ：include “opencv2/xfeatures2d/cuda.hpp” Report errors , It's because I can't find /cuda.hpp, Let's just put this cuda.hpp Set to absolute path , To find the /cuda.hpp file .

If you follow my path above , Generally speaking , All in /home/pi/Downloads/opencv_contrib-3.4.0/modules/xfeatures2d/include/opencv2/xfeatures2d here

Then we found the file that reported the error （/home/pi/opencv-3.4.0/modules/stitching/src/precomp.hpp）, Modify the line reporting an error

And then include “opencv2/xfeatures2d/cuda.hpp” Change to include “/home/pi/Downloads/opencv_contrib-3.4.0/modules/xfeatures2d/include/opencv2/xfeatures2d/cuda.hpp”, Then save ,

In short, this type of solution is the same , All the missing files are here /home/pi/Downloads/opencv_contrib-3.4.0/modules/xfeatures2d/include/opencv2 The inside . encounter “ There is no file or directory ” Just go to this folder to find , use pwd Get the path , Then modify the path in the error file .

Another thing to note is ,make After failure , If you want to re make, First of all clean Before you drop it make Of , stay build Under the table of contents , perform

make clean

  And then again

make

  As shown in the figure below , It was successful （ It is estimated that more than three hours ）

100% After that, no error was reported , Congratulations , It's going to work ！

The next in build Under the table of contents , next （ You need to run under administrator conditions , If you are not an administrator , Please first su）

make insall

This command takes half a minute , If there is no error, it means success .

7、 stay Python3 Up test OpenCV

open python3, I don't need to say orders

First

import cv2

then （ Notice the two underscores ）

cv2.__version__

The effect as shown in the figure appears , That's success .

Required documents

opencv3.4 Files and missing files .zip: https://089u.com/file/30936724-479224952 Access password ：123456