The programmer can’t do any extra optimization by selecting different available Optimization flags.The method allows you to add your own features or get rid of already present features, this is especially useful when you want to use a feature which does not come with the default installation or when you are deploying on a device with limited memory so then you can get rid of unnecessary features.You can select some Optimization flags and get fast performance in some areas of the library.

The installation is a tedious process, many things along the way can go wrong.

To work with the flags you must be familiar with the library so you know which features to enable or disable for your specific purpose.

In order to update you have to do more than just run a single line of command.

In this tutorial the two main advantages from source installation that you will get, first you will be able to enable the Non-Free Algorithms in OpenCV. In later versions of OpenCV you can’t use algorithms like SIFT, SURF, etc as they are not installed with pip, but with source installation you will be able to install these. You will also be able to enable Cuda flags so that you can use Nvidia GPUs with the OpenCV DNN module, which will give you a huge speed boost when running neural nets in OpenCV. You can still follow along if you don’t have an Nvidia GPU, you will just have to skip that part. Note: I’m assuming that you already have python installed in your system, if not then you can go ahead and install anaconda distribution for python 3.7 here. Step 0: Uninstall OpenCV ( Do this only if you already have OpenCV installed ) Gpu support opengl 4.4 install# If you are installing OpenCV in your system for the first time then you can ignore this step but if you already have installed OpenCV in your system then this step is for you.

After Uninstalling these then you should see an error when you import OpenCV by doing: import cv2Ĭlick here to go to the OpenCV release page.

Click on the Sources button, and you’ll download a zip folder named opencv-4.3.0.zip.

Make a new folder named “ OpenCV-Installation” and extract this zip folder inside that folder.

You can then get rid of the zip folder now. The contrib package in OpenCV gives you a lot of other interesting modules that you can use with but unfortunately it does not come with the default installation so we have to download it from Github.

Download the Source code (zip)įrom here and Unzip it in the OpenCV-Installation directory.

Does my gpu have opengl 4.3