How to Build and Install OpenCV from Source | Using Visual Studio and CMake | Computer Vision

How to Build and Install OpenCV from Source | Using Visual Studio and CMake - In this video I will show you how build and install OpenCV (Open Source Computer Vision) from source code. This will allow you to use OpenCV with every programming language! OpenCV is a library for computer vision and machine learning that contains over 2500 algorithms for you to use. OpenCV gives you the tools to perform facial detection, object identification, and much more.
#opencv #computervision #tutorial
Learn more about OpenCV on their official site: opencv.org/about/
Install CMake: cmake.org/download/
Install Visual Studio: visualstudio.microsoft.com/do...
Download OpenCV source: opencv.org/releases/
OpenCV contrib repo: github.com/opencv/opencv_contrib
In this video I cover:
1. Installing CMake so you can generate binary source code.
2. Installing Visual Studio so you can build source code.
3. Building and Installing OpenCV from source and verifying it works.
If you enjoyed the video, toss it a like! 👍
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Thanks so much for watching!
- The AI Guy

[@TheAIGuy]

Let me know what other OpenCV or Computer Vision videos you would like to see!

[@samueldare29]

Hey Man it keeps giving me this error share.getcloudapp.com/jkulORkA please can you help out?

[@PUBUDUCG]

While your project is open in VS, someone is changing the files in the project. Did you configure Cmake and built with no red lines ? I used VS2019 and did not have any compiling issues

[@parsasarosh4079]

If yolov3 can be used to detect brain tumors. Which data set should be used? Can you make a video how to perform transfer learning in yolov3 for that dataset.

[@aaaafireball9322]

for whoever is reading this, if your INSTALL build doesnt work, exit VS, open cmd as admin, navigate to the build folder and open Opencv.sln from the CMD window

[@anuragdhyani1712]

no cv 2 module .......... DUDE , already put in path so please don't suggest path update in environment variable ! Please halp

[@joycechen7535]

For anyone thats getting errors on building, try to run the cmake throught admin. It worked for me!

[@raflesia1822]

while more i learn this, at this time more i love it... :D thanks so much.(Your channel is Specialist)

[@omkargosavi7415]

What a wonderful tutorial... Amazing... Thank you Man... Really helpful.

[@areennasrawi9054]

Thanks a lot for your help, I did all the steps and cv2 appeared in the cmd screen but not in the pycharm. What should I do?

[@PUBUDUCG]

I am new to this and managed to get everything compiled VS2019. Its shows all succeeded but it still could not be accessed from Python. I removed all old opencv versions and Python and included a fresh copy of Python before Cmake steps. Whenever I import cv2, says it does not available. What communication happens with Python when installing the project in VS build ? site packages folder in Python does not have any reference to OpenCV. I added build/install folder path in windows path as well. My questions here is how does python knows if the Cv2 library is installed ?.

[@sashthecreator]

after the second config on cmake i got a single red line on 'BUILD_opencv_bgsegm' please help?

[@heyalexluu]

A solution if Cmake doesn't compile, try to uninstall C++ on VS and reinstall. Worked for me! Everything else went smoothly.

[@marsinsmusic]

top guidance! thank you so much! Greately appreciated!

[@kevinwu2040]

Thank you. This is really helpful, and I really appreciate it.

[@sesgiog]

If I try activating the CUDA for the GPU Acceleration via configuring it, should it work?

[@aloufin]

How do you install this into a miniConda environment? e.g. is it possible to install these into each env you have set up?

[@MartinLind16]

I used the Opencv 4.4.0 source version and after reconfigure the contrib modules I still had red lines. Mostly they include the topic caffe_INCLUDE_DIR not found. Can I disable Caffe include and HDF5? Or what can I do to get rid of the red lines

[@fatihfuad1909]

hi, it worked for me thank you, but can i know what happened if i delete the " build " folder after everything is done? I still can use cv2 module or not?

[@NeroEinstein1973]

Thank you sir. This was very valuable.

[@panagiotissavvidis8271]

Hi Man, i got the following while cofiguring the second time when i added the contrib folder/modules "data: Download: face_landmark_model.dat CMake Warning at cmake/OpenCVGenSetupVars.cmake:54 (message): CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install directory Call Stack (most recent call first): CMakeLists.txt:967 (include)" is that something to worry?

[@andrewcilia3581]

Your tutorials rock !!

[@TheAIGuy]

Appreciate it!

[@BdyPhrk]

Now that I have the source code in visual studio, why can't I just add my external project and include in main.cpp, it doesn't work.

[@i_am_great6344]

What files should i add in environment variables and visual studio

[@M2Itacho15]

Hi ! Can you please tell me why when i run INSTALL, after BUILD_ALL, visual studio starts the building process again instead of installing?

[@anamaykane9355]

Hello, I am using Eclipse with C++. I don't need Python but in CMake, Python2 keeps showing up as red even after removing the entry. What to do?

[@nicechang2468]

How can I build opencv2 on ubuntu? It failed, and a commit issuse on gihub but in won't be fixed.

[@ajmalhadi97]

how to get the cmake recognize the python interpreter? Mine the OpenCV.sln file doesn't show. Is it because the python interpreter?

[@albius96]

so i was trying to install open cv and have to create a python project, the problem is when i build the all build it gives me the "opencv_python2.vcxproj"error not completed, what should i do?

[@kotai2003]

How to uninstall the Opencv which I build with cmake and visual studio?

[@praveenkispotta1999]

After I uninstall opencv-python in the command prompt...it does not import cv2 , I tried many times

[@joshgibson539]

For those having a problem install Python from the executable found on their website and not Windows Store. Then you will automatically get Pip working as well. First type out python then hit enter. To find out the cv2 version after importing copy and paste this exactly as is for some reason it has to be specifically copied and presented this way: "import cv2 cv2.__version__" Just don't copy it with the quotation marks otherwise it won't work. Also keep the indentation for the next line it's key to making it function for some reason. Then hit enter once again. Leave a thumbs up if this worked for you like it did for me. I followed everything but that portion was the toughest.

[@evelynjunco4574]

Hi Josh, if i copied and pasted "import cv2 cv2.__version__" and it will only copy "import cv2", then show the error and "cv2.__version__" on the line after that. Btw, the error I get after import cv2 is : Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'cv2'. Please help!

[@pkz111111]

Issue when building OpenCV 4.4.0 from source. When I build "ALL_BUILD" and "INSTALL" projects using VS2019 Windows10 I got 2000 somthing warnings (only warnings no errors at all) saying: "Warning: field of class type without a DLL interface used in a class with a DLL interface" and "Warning: base class dllexport/dllimport specification differs from that of the derived class" Pre install CUDA 10.1 with matching cudnn. GPU: RTX 2080. When tring to build darknet for using YoloV3 it dosen't showing CUDA in cMake.

[@MutenRoshiUI]

I followed the steps and my build was success . But i am using Anaconda , so when i tried importing cv2 in base env it says NO module cv2.

[@weixiangng8279]

@The AI Guy, love your video.

[@hhotsauce]

I get an error " cmake error at CMakeLists.txt:106 (enable_language): generator Visual studio 16 2019(I'm using VS 2017 tho :/) could not find any instance of visual studio" how do I fix this??? Please help

[@zeynabamanat]

This is very helpful, thanks! but I want to use opencv in android so how can build it for android with libc++ and ndk r21e? from what step must change opencv building?

[@jhonjamiltonmajinerazo7894]

Congratulations on the video. A guide on how to use this opencv configuration in an anaconda environment would be excellent. since anaconda usually uses '' conda install -c conda-forge opencv '' and nowhere is it possible to make the settings to use the GPU.

[@ba-en1io]

Im getting the error Traceback (most recent call last): File "", line 1, in File "C:\Users\bisma\AppData\Local\Programs\Python\Python38\lib\site-packages\cv2\__init__.py", line 89, in bootstrap() File "C:\Users\bisma\AppData\Local\Programs\Python\Python38\lib\site-packages\cv2\__init__.py", line 79, in bootstrap import cv2 ImportError: DLL load failed while importing cv2: The specified module could not be found. Please help me resolve it.

[@divyasree53]

@AI Guy, when importing cv2 it gives import error:DLL load failed. The specified module could not be found.

[@dkibe6006]

I have a question... if I install OpenCV from the source will it also be set up in my virtual environment correctly?

[@AdmMusicc]

Is it possible to use this manually built opencv package in a virtual environment? If yes, can someone guide on the steps involved?

[@9934max]

Hi Thank you for tutorial, after Building the model , i got the error "Severity Code Description Project File Line Suppression State Error C2872 'SIFT': ambiguous symbol opencv_test_xfeatures2d C:\Users\Public\OpenCV\opencv_contrib-4.3.0\modules\xfeatures2d\test\test_features2d.cpp 100 ". I though my earlier python-opencv causing the issue, so uninstalled the python-opencv and rebuild the program. still i am get above error, can you help me on this

[@peregrinussolutionsllc6010]

Thank you again for posting such amazing content! I appreciate your assistance to my previous comments to this video. I wasn't able to devote much time to this project for a couple of weeks until today. I just finished successfully installing everything on a different hard drive/copy of Windows by following your video only! I'm going to install Cuda Toolkit next. Then its: The AI Guy YOLOv3 Object Detection with Darknet for Windows/Linux | Install and Run with GPU and OPENCV video here we go! :-) We greatly appreciate your videos, thanks again for them and your help in the comments!

[@TheAIGuy]

Glad you got it to work! Hope everything else goes smoothly! You can also try "Yolov3 in the cloud..." video and it will easily install darknet and allow you to run yolo detections in the cloud!

[@rob26r]

Man - I must be dumb. I keep getting the can’t find module error message. I reviewed all previous posts and troubleshot it to death but no luck. I’m uninstalling anaconda then will try again.

[@TheAIGuy]

@@rob26r you are getting the cant find module cv2 error?

[@TheAIGuy]

@@rob26r if so google "add opencv to path" and follow along with one of the solutions

[@rob26r]

The AI Guy yes that is the error message. I saw that comment from another user. I got too tired last night to follow it but back at it now... thanks!!

[@hariteja6188]

I have done the same thing for cv2 3.4.10 version but I couldn't get it install .

[@alishatechz7035]

Hello I want help whenever I download open CV Contrib from Git Hub it also show some error in the file not extracting the data . Plz guide me

[@MrMiniMe03]

Hey thanks alot for the good tutorial, I was wondering how to get pycharm to work with the opencv version just built, now I just run the .py files from terminal, seems like "pycharm python" and python is two different installs.

[@TheAIGuy]

if you are using pyn how charm then I think you can just install opencv-python and it should work. Check out my separate video on how to do this!

[@anamaykane9355]

How to build and install OpenCv using mingw and cmake with Eclipse in Windows 10?

[@LathaTutorial]

so i am getting error while configure in cmake so plz reply so it is showing error and project files may not be uploded corectly so plz solve i am ur subscriber

[@iam_a_sad_khan]

after installation when I type import cv2 in python, I am getting an error "ModuleNotFoundError: No module named 'cv2'". Can someone help me out? is it because I haven't set the environment variable of the directory in which I built this OpenCV project?

[@adithikashain9007]

i also have the same issue. did you fix it?

[@moawiyaguinoubi836]

hi, thank you for the video really amazing, but i have this warning that keeps coming up everytime i try to build OpenCV with VS: "field of class type without a DLL interface used in a class with a DLL interface", i get like 5000 warning like this, mind you that i am still going to build the darknet for YoloV3 after this, idk what to do, can you please help me.

[@karljoyeux8845]

Hi, I did every steps but when I try to check the version with python it says cv2 has no module __version__ do you know why ? Plus I still can't use opencv on my vscode but thanks anyways. Hope you will see this !

[@calitosmenem]

Great video AI Guy. I also got the error ' ModuleNotFoundError: No module named 'cv2''. I solved it with next steps: 1. Install Pyhton 3.7, not 3.8 o higher. 2. install numpy before running cmake (cmake doesn't recognoise numpy path if missing) 3. set environment variables C:\Users\xxxxxx\OpenCV\build\install\x64\vc16\bin to PATH C:\Users\xxxxxx\OpenCV\build a OPENCV_DIR to OPENCV_DIR 4. Reboot!

[@vaidippatel529]

I am also getting same error.Tried your way but not helping may be i messed up in 3rd step can you please explain it..

[@ericbighead8953]

Perfect Video and well explained. In the end I would have just expected an example in VS. One question: Don’t we have to set environment settings in windows for openCV?

[@GaryMarkowski]

Yes. You should add a path similar to C:\OpenCV\opencv-4.7.0\out\build\x64-Debug\bin in the Windows system "Environment Variables" (Path variable). Then close and reopen Visual Studio for the Path settings to take effect. Do this after you Build OpenCV. If you create the Install for OpenCV, then you can use a path similar to C:\OpenCV\opencv-4.7.0\out\install\x64-Debug\x64\vc17\bin instead. This Path is used when you create a project that uses OpenCV.

[@ravirajsinhdabhi9255]

I used opencv 4.2 source version, my all build and install code succeeds but still when I’m importing cv2, module not found error occurs!!!:( So i have to add opencv to path environment variable???

[@akshayhulkuli9971]

pls give the solution for this , even i have got the same error

[@bakamiku9428]

@RealfagsMorten Thank you so much. It worked for me!

[@jeffreyli3268]

@RealfagsMorten I run the "All_Build" and "Install-Build" in a second time, bui it stll didn't work

[@jjhennessy9960]

@RealfagsMorten Thank you for the solution! I was running into the same issue and this fixed everything

[@dingyuliu7336]

@RealfagsMorten After building "install" again, I still got this ModuleNotFoundError, do you have any ideas about it..

[@abhinavmishra9323]

i have done exactly the same as told in th tutorial but when i am running it is saying access denied i have edited the environment variables and included in that the bin folder but still its the same issue somebody please help

[@fatihgenc7385]

I can't also import openCv after all steps, i use anaconda and paths also added to system variables. HELP !

[@zekerich5823]

The install was amazing, only one i could get to work! Wish you could make a video on OpenCV basics. Like how to use it now that its installed. Thanks!

[@andhikatidarprasetyo1968]

can we use the generated opencv in vs code?

[@aqiffmursyideen3830]

hello there, i've setup my CUDA, CUDNN before and its version 10.0, Its just that I need to use MSVC 2017 and not MSVC 2019. However, I did not get the OpenCV.sln after finish configuration. Can you help me?

[@urbansmurf6669]

you yo need to press 'Generate' for the OpenCV.sln to appear (I believe)

[@ibrakaya1773]

when I build ALL_BUILD, my pc shut down suddenly after 2 minutes. do you have any idea about this situation?

[@qzorn4440]

great video... i was using opencv on the raspberry pi, which is nice. now for opencv on windows. very clear presentation. thanks a lot...:)

[@feraudyh]

Is the contrib download tightly coupled to the core dowload? I mean I downloaded version 4.5.5 for the sources of the main version, but I did not see a version on the contrib.

[@AnPhu-yy2pk]

me too

[@thetrainoflife8327]

I'm selecting 'with_qt' also , but I'm Getting error about qt

[@noeltam75]

can u explain why the reds can be cleared after the 2nd configure without any changes?

[@simplevc2980]

maybe...just maybe....it detect changes...so from nothing to first configure , that's all the changes....and second configure when nothing changes turns to white

[@Luk3r]

Can we get an update on this please? I've followed each step perfectly three times over and it never works :( I assume there's something else you need to do these days.

[@tahrirsiddiqui6588]

Firstly, thanks a lot for this brilliant tutorial! So I keep getting the following error when I configure in cmake, even after adding the contrib path: CMake Warning at cmake/OpenCVGenSetupVars.cmake:54 (message): CONFIGURATION IS NOT SUPPORTED: validate setupvars script in install directory Call Stack (most recent call first): CMakeLists.txt:967 (include) Also, I noticed that the python path after I configure is to the Anaconda3 folder for 3.7, although I deleted 3.7 and installed 3.8 with the windows system path for python also pointing to the location where I downloaded 3.8. Maybe that could be the reason? I've been banging my head over this so I'd really appreciate some help!

[@jonosmilesalot]

did you ever get a solution to this? I'm struggling with the same thing. :(

[@weixiangng8279]

The AI Guy, does the compilation in visual studio affected by computer low ram?

[@sibghariaz974]

hi sir thank you for great tutorial. i have a problem that there is red lines after configure the contrib module path please suggest any solution? thank you in advance reply m as soon as possible because i m stuck in it and i have less time to do my project

[@erolgyte]

i got similar error. Python 3.7.7 (tags/v3.7.7:d7c567b08f, Mar 10 2020, 10:41:24) [MSC v.1900 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'cv2' >>>

[@user-jl4wk5ms4f]

same problem how to solve?

[@dabody123456]

عالمي انت عالمي شكرا كثيرا ❤️❤️ ممكن اذا سمحت فيديو اخرا مشابه لهذا بدون Visual Studio اعرف طلبي صعب :""(

[@areennasrawi9054]

the error still there >>> import cv2 Traceback (most recent call last): File "", line 1, in ModuleNotFoundError: No module named 'cv2' pleaaase I neeeeeed help SOS

[@sashthecreator]

this fixed mind by running 'py -3.7 -m pip install opencv-python' Note: 3.7 will be changed to whatever version of python you have installed on your system.

[@saul1265]

@@sashthecreator but it doesn´t work for SIFT.

[@fernandodealmeida9748]

I assume you got this message in the Terminal of visual studio code. If you want to do it in Visual studio code, create a .py file, and then run it. or you can run a 'CMD windows", after active python and they try to import cv2.

[@ednincer]

Hello. I am doing "ALL_BUILT" (10:14) but I'm getting Build: 40 succeeded, 154 failed I'm getting a lot of LNK1181 errors, example: cannon open input file '..\..\lib\Release\opencv_core430.lib' and some C1189 errors: example: unsupported Microsoft Visual Studio version! Only the versions between 2013 and 2017 are supported (Project opencv_core, file host_config.h). I'm using MS Visual Studio 2019, same as you. Please let me know what can I try. Thanks!

[@prembanker8308]

same for me. I dont know how to proceed next

[@fatima-oz3ne]

If you solve this problem PLEASE HELP ME!!!

[@Sm0rezDev]

Try the opencv master branch from the github repository: github.com/opencv/opencv

[@DineshCrazYGuY]

Hi i have a query.. after i press configure in cmake after checking the required options. I get download error for some of the modules.. it says "libcurl doesnot support https proxy" Actually i am working behind company proxy.. Please guide me

[@DineshCrazYGuY]

I have already set the HTTP_PROXY and HTTPS_PROXY environment variables..but still the error persist..

[@adityashah4333]

Done building project "INSTALL.vcxproj" -- FAILED. is the error that I am getting in the VS code Can anyone help me?

[@MutenRoshiUI]

I followed the steps and my build was success . But i am using Anaconda , so when i tried importing cv2 in base env it says NO module cv2. Anyone help. who uses Anaconda.

[@sherzodnurullayev1239]

Hey man. Fantastic tutorial. The most clear one I've seen so far. But I have a dumb question. Why we need to install opencv from source? What is wrong with installed opencv using PIP?

[@oddcloud9022]

Building from source gives a few advantages over installing over pip (Python’s installer) • Allows you to install and select your own features (like in this example the contribution expansion library is added, you can also install other things like CUDA utilization) • Allows you to select the install location • Allows you to select optimization flags for faster performance of OpenCV (for example if you’re installing it with CUDA) • Allows you to add or remove features during installation A disadvantage of building from source though, is that you’re responsible for updating the install yourself (keeping up with new features, security patches, etc).

[@dume85]

is anyone else getting this error? CMake Error at cmake/OpenCVModule.cmake:370 (_glob_locations): Syntax error in cmake code at C:/OpenCV/opencv-4.4.0/cmake/OpenCVModule.cmake:370 when parsing string C:\OpenCV\opencv_contrib-4.4.0\modules Invalid character escape '\O'. Call Stack (most recent call first): modules/CMakeLists.txt:7 (ocv_glob_modules)

[@vigneshb.r9569]

After building the install in VS 2019, I checked on the command prompt and it shows that "no module named cv2"

[@visarbedzeti2780]

hey did you find out how to fix this?

[@aleemrehmtulla]

Thank you!

[@pratimasingh4307]

How do uninstall the OpenCV built using this?

[@anuragdhyani1712]

no cv 2 module .......... DUDE , already put in path so please don't suggest path update in environment variable ! Please halp

[@BOHICAMAN1]

Followed every step in video correctly. No red at all in CMake. Loaded OpenCV.sln into VS2019 and got what appears to be 500+ file errors that all seem to end with same error: C:\OpenCV4\Build\ALL_BUILD.vcxproj : error : Error HRESULT E_FAIL has been returned from a call to a COM component. No idea what is wrong! Also, at the top of VS screen "Solution Configurations" and "Solution Platforms" boxes are grayed out.

[@BOHICAMAN1]

Disregard my last Comment above. I reloaded CMake and clicked the"Open Project" button next to the Config and Generate buttons. I then re-loaded OpenCV,sln into VS2019 and all worked. Apparently it didn't like me loading the ,sln file from outside CMake. Great Video!!

[@aloufin]

THANK YOU! had this problem on windows 10, VS2019

[@kobishamir3]

Hi and thank you! while I write ' import cv2' I am getting this message: ' ModuleNotFoundError: No module named 'cv2' ' can you help me out?

[@fahidlod1]

I had the same error and the above reply did not work for me. Try this: pip install opencv-python. OpenCV should begin installing in the cmd window, then as shown in the video >import cv2. Then next line >print(cv2.__version__). This should work

[@kobishamir3]

@@fahidlod1 thank you bro! It worked

[@fahidlod1]

@@kobishamir3 no problem! I had the same problem last night and took me hours to solve it hahaha so glad I could help

[@dirozx]

@@fahidlod1 This video is about installing opencv from source not installing it with pip.

[@hadighahremannezhad2725]

I did everything, still python can't find opencv: ImportError: DLL load failed while importing cv2: The specified module could not be found.

[@niltoncesarrojasvales246]

How can i uninstall opencv? I've tried build 'uninstall' instead of install but still exists in python

[@auto9358]

Thanks for the video! Tried running the import cv2 to confirm in the cmd prompt and no luck! Also how about integrating openCV into the visual studio IDE so that it can reference the functions, etc.

[@auto9358]

maybe you skipped the step of adding opencv to PATH env

[@drixe7024]

I have the same issue that import cv2 doesnt work How did you fix it?

[@imnischaygowda]

Awesome Content. While buidling OpenCV in Visual studio "warning : field of class type without a DLL interface used in a class with a DLL interface" I got this error, haven't found anyway to correct it.

[@user-tj5zv2ts9d]

I have the same warning

[@anirudhdashottar1828]

Any solution found?

[@chandandebnath3211]

I did the same thing as you showed in the video but it did not create any opecv.sln file for my case. what should I do now?

[@TheAIGuy]

chandan adittyo did you receive any errors in configuration or generate?

[@chandandebnath3211]

@@TheAIGuy yes In your video you import the source code from open cv but in my case i have to choose the opencv/sources for source code and 1st time it showed some red list and i have edited the file location and reconfigure it but still there was no opencv.sln

[@furkanaydnoz8905]

Hello 1 package is installed after doing 'install' in visual studio. But there is no cv2 import in cmd

[@nondeterministic]

any luck?

[@johncaling6150]

Make sure you are running import cv2 in the same python environment what was selected in the Cmake

[@johncaling6150]

@Armaan Priyadarshan Make sure you are running import cv2 in the same python environment what was selected in the Cmake

[@johncaling6150]

@@nondeterministic Make sure you are running import cv2 in the same python environment what was selected in the Cmake

[@Thamiah]

any luck?

[@DevRaj-te1kh]

AttributeError: module 'cv2' has no attribute '__version__'

[@johncaling6150]

I get error LNK1181. How to fix this?

[@kaviyadharshini6383]

I am so new to these language and software, I have an error MSB3073 the command SETLOCAL while building the INSTALL and the output shows : 2>Done building project "INSTALL.vcxproj" -- FAILED. ========== Build: 1 succeeded, 1 failed, 163 up-to-date, 0 skipped ========== Kindly,someone help.thank you!

[@MuhammadAbbas-vh8ff]

Hello sir, Your videos are very valuable and your method is very good to understand. Also i face a issue while building OpenCV from source kindly help me. I do all the processes successfully which you show in this video to build OpenCV from source and it didn't show any error while building. But at the time of verifying the OpenCV is installed successfully or not it didn't import cv2 in command prompt. Kindly help me to configure this issue. Thank you

[@Titandosgames]

I have the same issue

[@SharkbaitDC]

Build ran great, but now I don't know how to include the library to the actual C++ projects so I dont get a bunch of red underlines telling me it doesnt understand some commands.

[@dogeilante]

dude how did you figure this shit out

[@RI-zr3go]

If an error occurs when "import cv2' "ModuleNotFoundError: No module named 'cv2' before building CMack install in python "numpy" for this, write the command 'pip install numpy') OpenCv 4.5.1 instaled in windows Python 3.6.8

[@joaosilva5483]

Hi. Everything worked for me and i didnt get any error importing cv2, but when i do cv2.__version__ i get an error cv2 has no attribute version

[@jasmeetsingh2666]

I am having the same issue....if you have resolved this issue.....can you share the solution.

[@joaosilva5483]

@@jasmeetsingh2666 I don't remember how I fixed it. I think that opencv is successfully installed. If you are trying to install DARKNET, like I was, when generating code for DARKNET or other project in cmake you can define Opencv_build folder I think. That's how I remember at least

[@RMdimension]

So in the last step it prints out Version 4.2.0, even though I downloaded Version 4.3.0. Is this a problem?

[@kavinduwijesinghe7771]

The same thing happened.

[@sergiyisakov5192]

did you succeed to build 4.3.0? For me it tells it cannot find SIFT in xfeatures2d, I think it's not supported since some release

[@krishnasahoo6676]

ALL_BUILD completed successfully without error. But while building the INSTALL, I got 1 error with code MSB3073. Please help.

[@pathumrathnayaka2840]

Hi! Few of the extra modules; such as SFM, VIZ, etc... were missing after configuring with Cmake. Any help would be much appreciated. Thanks in advance!!

[@evankolberg]

C:\>python Python 3.6.8 (tags/v3.6.8:3c6b436a57, Dec 24 2018, 00:16:47) [MSC v.1916 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import cv2 >>> print(cv2.__version__) Traceback (most recent call last): File "", line 1, in AttributeError: module 'cv2' has no attribute '__version__' I am able to import cv2 but I can't check the version. I downloaded the same version as you though, 4.1.2. Does this matter?

[@rahuldas6109]

Sir I need help, please tell me how to fix this: >>> import cv2 OpenCV bindings requires "numpy" package. Install it via command: pip install numpy Traceback (most recent call last): File "", line 1, in File "C:\Program Files\Python312\Lib\site-packages\cv2\__init__.py", line 11, in import numpy ModuleNotFoundError: No module named 'numpy' and I tried installing numpy using pip install numpy but its still showing same this error

[@tuanazzam6320]

I did exactly as you did it. But still it is not build and give errors. CMake Error at cmake/OpenCVModule.cmake:274 (message): No modules has been found: D:/AzzAM/After2020/MyPrograms/VS_Programs/AdditionalLibraries/raw_libraries/CV/opencv_contrib-4.5.2 Call Stack (most recent call first): cmake/OpenCVModule.cmake:356 (_glob_locations) modules/CMakeLists.txt:9 (ocv_glob_modules) That is the errror output

[@kushshah1288]

I am getting the following error: CMake Error: Cannot open file for write: C:/Program Files/Opencv/build/CMakeCache.txt.tmpab264 CMake Error at cmake/OpenCVUtils.cmake:924 (file): file problem creating directory: C:/Program Files/Opencv/build/CMakeFiles/dephelper Call Stack (most recent call first): CMakeLists.txt:80 (include)

[@vagheladarshan570]

i am getting "msb3073 the command setlocal" errror after build install help