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...]
Color spaces in OpenCV (C++ / Python)
In this tutorial, we will learn about popular colorspaces used in Computer Vision and use it for color based segmentation. We will also share demo code in C++ and Python. In 1975, the Hungarian Patent HU170062 introduced a puzzle with just one right solution out of 43,252,003,274,489,856,000 (43 … [Read more...]
Neural Networks : A 30,000 Feet View for Beginners
In this article, I am going to provide a 30,000 feet view of Neural Networks. The post is written for absolute beginners who are trying to dip their toes in Machine Learning and Deep Learning. We will keep this short, sweet and math-free. Neural Networks as Black Box We will start by … [Read more...]
Alpha Blending using OpenCV (C++ / Python)
In this tutorial, we will learn how to alpha blend two images. Want to overlay a transparent PNG image over another image? Well, this tutorial will help you do that in OpenCV. We are sharing code in both C++ and Python. What is alpha blending? Alpha blending is the process of overlaying a … [Read more...]
User stories : How readers of this blog are applying their knowledge to build applications
Many years back, as a student who was getting his hands dirty in the emerging field of computer vision and machine learning, I lived in a constant state of amazement. The fact that a piece of code I wrote could find circles in an image in under 10 seconds (yes, seconds, not milliseconds) made my … [Read more...]
How to select a bounding box ( ROI ) in OpenCV (C++/Python) ?
In this tutorial, we will learn how to select a bounding box or a rectangular region of interest (ROI) in an image in OpenCV. In the past, we had to write our own bounding box selector by handling mouse events. However, now we have the option of using a function selectROI that is natively part of … [Read more...]
Automatic Red Eye Remover using OpenCV (C++ / Python)
In this tutorial, we will learn how to remove red eyes from a photo completely automatically. Just thinking about this problem of red-eye removal brings back memories from my childhood. I grew up in small towns in India where not every family in my middle-class neighborhood had a camera. My … [Read more...]
Bias-Variance Tradeoff in Machine Learning
In this post, we will develop an intuitive sense for an important concept in Machine Learning called the Bias-Variance Tradeoff. Before we dive into the subject, allow me to go off on a tangent about human learning for a little bit. Practice alone does not make you better at a skill. We all … [Read more...]
Embedded Computer Vision: Which device should you choose?
At Big Vision LLC, we receive requests for a lot of consulting projects where the solution needs to be delivered on a small single board computer like the Raspberry Pi. For example, one company wants to build a vision system for accurately detecting the state of railroad crossing signals ( a pair of … [Read more...]
Object Tracking using OpenCV (C++/Python)
In this tutorial, we will learn about OpenCV tracking API that was introduced in OpenCV 3.0. We will learn how and when to use the 6 different trackers available in OpenCV 3.2 — BOOSTING, MIL, KCF, TLD, MEDIANFLOW, and GOTURN. We will also learn the general theory behind modern tracking algorithms. … [Read more...]
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