How to Install OpenCV in Ubuntu for C / C++ (Ubuntu 18.04, Ubuntu 20.04 )

In this post we will see How to Install OpenCV in Ubuntu for C/C++.
OpenCV is an image processing library created by Intel and later supported by Willow Garage and now maintained by Itseez. OpenCV means Intel® Open Source Computer Vision Library. It is a collection of C functions and a few C++ classes that implement some popular Image Processing and Computer Vision algorithms. OpenCV is Available on Mac, Windows, Linux (Terminal environment).

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[davidgogelein]

For all of you wondering how to fix the *Package opencv was not found...* Problem.
Use these commands instead:


pkg-config --modversion opencv4

g++ main.cpp -o output `pkg-config --cflags --libs opencv4`


Worked for me, hope I can save some time for someone, took me several hours to figure out what was wrong

[dimasveliz]

hey y'all if you were in 2020, there are two important comments in this whole chat. The fist made by @Jeff D'Stéfano Z. Cooper. And the second made by @Nhat Le Quoc Nhat. They really help! thanks!

[nero]

Thanks ! It works perfectly for me (Linux Mint 19.1 and Qt 5.12).
I had to change "python3.5-dev" to "python3.7-dev", and to remove "libjasper-dev" because apparently it doesn't exist anymore.

[JeffryCooper]

It worked perfect, but I made a little change. Just as the user "nero" said: "I had to change 'python3.5-dev' to 'python3.7-dev', and removed 'libjasper-dev' because apparently it doesn't exist anymore." That was really usefull.

[alejandrosanchez]

You are amazing. I was trying to build opencv from source to use the modules for this udacity course. I did it on a VM on vmware but now that I upgraded to windows pro 11 I decided to start using hyperV so I had to remake a new VM since converting the vmware to hyperV was causing issues. I remembered I did a tutorial and was looking for it for hours and now I finally found it. It was your tutorial! :)

[bhavukgarg]

on command make -j4 i got error :



[84%]Built target opencv_bioinspired
Makefile:162: recipe for target 'all' failed
make: *** [all] Error 2


//Please Help

[nicolasperez]

after you clone the opencv repo, you can choose which version you want to install using the 'git checkout' command. I ran 'git checkout 3.4' to install opencv 3.4. I also removed '-D from my cmake command, to avoid conflicts from changing my opencv version

[mohammedhakeem]

after I followed all the instructions and when run this command
$ pkg-config --modversion opencv
this what i get
Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found

any one help me please?

[denver_dalman]

For everyone who had a problem after entering:
pkg-config --modversion opencv

Which showed:
"Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found"

Fix:
pkg-config --modversion opencv4

the package folder changed to opencv4 instead of opencv alone.

[samueldesantis]

@10:38 I get:

"Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found"

I went through the exact same steps several times and it still gives me this message. Any thoughts or solution?

[bldabirum]

I'm on ubuntu 18.04
It worked for me...

Thanks !!

[chrizu]

Íf u get "Package opencv was not found in the pkg-config" just run "sudo apt-get install libopencv-dev", works on ubuntu 18.04

[parasgupta]

I followed the steps but instead of version 3.2.x , version 2.4.9.1 got installed....

Can you please tell me how to get 3.2.x version?

How this 2.4.9.1 version got installed?

[lamebene]

hello! I followed all the procedures and everything went fine except for this error "No package 'tesseract' found" and the --modversion output for opencv is "2.4.9.1" can someone help me with this please

[DominoDayLive]

Great video! This worked for me while the tutorial on opencv itself failed.

[gullumpanie]

Please could you explain (or give a link) what happens in this part the command for compiling and linking the main.cpp : `pkg-config --cflags --libs opencv` ?

[grapesalt]

if you got error: No pakage opencv found
try this one:
pkg-config --modversion opencv4

[guardiansortico]

I followed all the instructions and it works! Thxs

[julianrendon]

Just a quick note that when running "pkg-config --modversion opencv" it gave me an error saying
"
Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc'
to the PKG_CONFIG_PATH environment variable
No package 'opencv' found
"


Instead run "pkg-config --modversion opencv4". It gives me the output for opencv4. If someone runs into issues maybe try other version like 2 or 3?

[danpop]

Thank you so much for this tutorial. Keep up the good work.