In this tutorial, we will compare the performance of the forEach method of the Mat class to other ways of accessing and transforming pixel values in OpenCV. We will show how forEach is much faster than naively using the at method or even efficiently using pointer arithmetic. There are hidden … [Read more...]
cvui: A GUI lib built on top of OpenCV drawing primitives
Often the development of a computer vision project involves tweaking parameters of a technique to achieve the desired outcome. These parameters could be the thresholds of an edge detection algorithm or the brightness of an image, for instance. If you don't use any graphical user interface (GUI) for … [Read more...]
Install Dlib on Windows
In this post, we will provide step by step instructions on how to install Dlib on Windows. Compiling Python modules such as NumPy, SciPy etc. is a tedious task. Anaconda is a great Python distribution which comes with a lot of pre-compiled Python packages. So we will use Anaconda as our Python … [Read more...]
Install Dlib on Ubuntu
In this post, we will provide step by step instructions on how to install Dlib on Ubuntu. Step 1: Install OS libraries Step 2: Install Python libraries We will use Virtual Environment to install Python libraries. It is generally a good practice in order to separate your project … [Read more...]
Install OpenCV3 on Ubuntu
In this post, we will provide step by step instructions for installing OpenCV 3 (C++ and Python) on Ubuntu. Step 1: Update packages Step 2: Install OS libraries Step 2.1: Remove any previous installations of x264 Step 2.2: Install dependencies Step 2.3: Optional … [Read more...]
Read, Write and Display a video using OpenCV ( C++/ Python )
In this post, we will learn how to read, write and display videos in OpenCV. Before we do that, allow me a digression into a bit of history of video capture. On June 15, 1898, in Palo Alto, California, a remarkable experiment was conducted to determine whether a galloping horse ever had all … [Read more...]
Install Dlib on MacOS
In this post, we will provide step by step instructions on how to install Dlib on MacOS and OSX. The installation instructions are slightly different for different versions of the operating system and XCode. Please choose the right one for you. Install Dlib on MacOS >= 10.11 & XCode >= … [Read more...]
Install OpenCV 3 on MacOS
In this post, we will provide step by step instructions for installing OpenCV 3 (C++ and Python) on MacOS and OSX. Step 1: Install XCode Install XCode from App Store. If XCode available on App Store is not compatible with your OS: Find XCode version compatible to your OS from this table … [Read more...]
Install OpenCV 3 on Windows
In this post, we will provide step by step instructions on how to install OpenCV 3 (C++ and Python) on Windows. Step 1: Install Visual Studio Download and install Visual Studio 2015 community edition from https://www.visualstudio.com/vs/older-downloads/. You can use Visual Studio 2017 as well but … [Read more...]
Get OpenCV Build Information ( getBuildInformation )
In this tutorial, we will introduce a quick way to check your OpenCV build settings. If you have ever compiled or installed OpenCV, you know it can be compiled with an overwhelming number of options. For example, when installed on MacOS with Homebrew, OpenCV3 has the following options. … [Read more...]
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