How To Install OpenCV in Ubuntu (Linux)

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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[yashmiglani]

hey all commands are run with no error but when i was trying to run this command pkg-config --modversion opencv then they showing error. Error is (Package opencv was not found in the pkg-config search path.
Perhaps you should add the directory containing `opencv.pc')
Kindly help on this.


to the PKG_CONFIG_PATH environment variable
No package 'opencv' found

[ramezanifard]

It was really really helpful. Many thanks.

[hmswrth]

I got this error while verifying the version
"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"

[emadmojtahedifar]

for openvc Version 4.0.0 (v4.0), you must use -std=c++14:
g++ main.cpp -o output `pkg-config --cflags --libs opencv` -std=c++14
and change 'CV_LOAD_IMAGE_COLOR ' to cv::IMAGE_COLOR

[PrajwalDsouza]

Best tutorial ever!! Clear and concise instructions...well done!

[sangammanbuddhacharya]

sir i am having problem
error: ‘CV_CALIB_CB_ADAPTIVE_THRESH’ was not declared in this scope
drawChessboardCorners(drawToFrame, chessboardDimension, foundPoints, found, CV_CALIB_CB_ADAPTIVE_THRESH);

[Dahaksha]

for some reason the pkg config, only shows the opencv 2.X.X

[datapiburma]

Thanks for your sharing . May I ask a question, is there any difference between 'cloning folder by using sudo su(as admin) ' and 'under normal Home as usual' ? because I did as normal way :( miss your instructions (to use sudo su).

[korkmazkagan]

In here g++ main.cpp -o output `pkg-config --cflags --libs opencv`. What does `pkg-config --cflags --libs opencv` do? Can you explain?

[itsgia]

i'm having this error:
E: Unable to locate package python3.5-dev
E: Couldn't find any package by glob 'python3.5-dev'
E: Couldn't find any package by regex 'python3.5-dev'

[davidtan]

Hi @ProgrammingKnowledge2, I followed step by step to download the Opencv on my Ubuntu 18.04. I've got the Opencv downloaded but the problem is I can't seems to get cv2 on my Ubuntu. Is there anyway to get cv2 on my system?

[vijaykumar-yqsf]

excellent, simple, easy.. thank you.

[kermadjislam]

hi, i'm really greatful for what you have done for us . my problem is when i wrote sudo su then press enter then i wrote below cd/opt/ and press enter it was appearing : there is no document with this type how can i solve this problem and thank you

[afrazkhan]

I get error as 'CV_PY_TO_ENUM'(cuda::Hostman::AllocType), what is this about?

[prashantsingh]

Please show a sample python program to show image. Thanks

[saitejareddyvenkat]

bro its working fine..now i am able to import cv dependencies in python script. Thank You so much..
GREAT WORK..

[JohnSmith-geqc]

E: Unable to locate package python3.5-dev
E: Couldn't find any package by glob 'python3.5-dev'
E: Couldn't find any package by regex 'python3.5-dev'

Not addressed, will have to try a different tutorial.

[geetanjalisharma]

i have installed opencv and import it but can't import cv2
plz help me

[trendingfever......]

i got error ''CMake Error: The source directory "/opt/opencv" does not exist.
Specify --help for usage, or press the help button on the CMake GUI.'