In OpenCV, a video can be read either by using the feed from a camera connected to a computer or by reading a video file. The first step towards reading a video file is to create a VideoCapture object.
In this post, we will provide a bash script for installing OpenCV-4.0.0 (C and Python 3.7) on macOS – High Sierra and Mojave. We will also briefly study the script to understand what’s going in it. Note that this script will install OpenCV in a local directory and not on the entire system. Let’s jump in 🙂. Free download page for Project OpenCV's opencv-3.1.0.exe.The Open Source Computer Vision Library has 2500 algorithms, extensive documentation and sample code for real-time computer vision. It works on Windows, Linux, Mac OS X, Android and iOS. Opencv For Mac; Opencv 3.1 Download; In OpenCV, a video can be read either by using the feed from a camera connected to a computer or by reading a video file. The first step towards reading a video file is to create a VideoCapture object. At this point, you should have OpenCV 4 and Python installed on your Mac. We can write a small test program that will print the OpenCV version, load an image from the disk, convert the image to gray and show the result. Start by downloading the next image: Save it as clouds.jpg.
I have trawled through all of Google's and Stack Overflow's search results in order to install stupid OpenCV on my Mac and all the methods have been completely useless.
I started trying to do this with OS X 10.8 and its XCode version and it didn't work. Now I'm on 10.9 and XCode 5.0.1.
I have tried mainly 2 methods:1) Downloading the .dmg file from OCV website and doing the CMAKE routine. When I get to the make -j8 step, at around 36% it gives me errors such as:
-make[1]: * [modules/imgproc/CMakeFiles/opencv_perf_imgproc.dir/all] Error 2
-Documents/Libraries/opencv-2.4.6.1/modules/ts/include/opencv2/ts/ts_perf.hpp:480:12: note: expanded from macro 'CV_PERF_TEST_MAIN_INTERNALS' while (++argc >= (--argc,-1)) {VA_ARGS; break;} /this ugly cons.. ^ ~~1 error generated.make[2]: ** [modules/imgproc/CMakeFiles/opencv_perf_imgproc.dir/perf/perf_main.cpp.o] Error 1
2) Using Homebrew at the end of which, even if I added the python path, when I do 'import cv' it gives me a 'no module named cv' error
I tried Macports as well a while ago so I don't remember the steps, but it didn't work.
It goes without saying that I've tried different versions of OCV and all have given me issues at the make step.
Any other solutions?
Rupert Cobbe-WarburtonRupert Cobbe-Warburton
2 Answers
There is a great tutorial located here. It highlights that the version you are trying to use 'is not compatible'. I am thinking that you should try installing the version stated in those instructions and see how you go.
The following instructions are taken directly from that link:
INSTALLING CMAKE
First you need to download the .dmg file under Binary Distribution of CMake here. At the time of I installed this, the file name is cmake-2.8.11.2-Darwin64-universal.dmg.
Upon completion of the installation you will be prompted whether to put CMake in /usr/bin, select Yes and finish installation
To ensure that CMake has been successfully installed, type cmake -version in Terminal
INSTALLING OPENCV
First, download the tar file of OpenCV 2.4.3 stable version here and DO NOT use the latest version. I struggled with the installation because I used OpenCV 2.4.6.1 and it's not yet compatible.
Extract the tar file in a folder and go to that folder through the terminal, e.g. cd Downloads/OpenCV-2.4.3
Now, each of the following line is to be executed in Terminal and must be executed successfully (no error)
mkdir buildcd buildcmake -G 'Unix Makefiles' .make -j8sudo make install
You are all set to use OpenCV!
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Steps for those who prefer to build opencv from source
I prefer to use cmake-gui instead of entirely doing this from command line, since that gives you more idea about the options available for opencv configuration and bring you in better position if you want to customize opencv build tomorrow ( like enabling java wrapper or OpenCL etc ).
- Download source either from opencv.org(1) or opencv githubrepo(2)
- Start cmake-gui.
- Set
source pathto downloaded opencv directory andbuild pathtoyour choice and click Configure button. - Specify generator as unix makefiles and pressContinue
- Choose compilers and click Done button.
- An options page with errors might be listed.
- Hovering mouse over any option gives a tooltip about the option. Edit option(s) as you feel fit. E.g.
CMAKE_INSTALL_PREFIX- change opencv install pathBUILD_SHARED_LIBS- build static or shared library. etc
Then click Configure again. If there are still errors, edit the option(s) causing the error and click Configure button. Repeat the edit / Configure cycle until there are no more errors. Once there are no more errors, proceed to step (8).
A minimal sample config of the WITH tab below. Feel free to play with options. This might cause build problems initially. But your understanding of build, will be better.
- Click Generate to generate make files.
- Type
make( in terminal at build folder ) - Type
make install
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