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Scanning QR Codes 3 Feb 2012 | 08:12 pm
These days, you can see QR codes almost everywhere. You see them at stores, on products, on screens. So one day, I was curious how the gears are put together to read QR codes. I ended up reading the I...
Implementing Canny Edges from scratch 2 Jul 2011 | 01:17 am
Here’s an interesting article – we’ll implement canny edges. We won’t use any prepackaged functions. I’ll be using OpenCV for this article, but I’m sure translating it to some other computer vision pa...
The Canny Edge Detector 28 Jun 2011 | 05:41 pm
A lot of people consider the Canny Edge Detector the ultimate edge detector. You get clean, thin edges that are well connected to nearby edges. If you use some image processing package, you probably g...
Image Moments 21 Jun 2011 | 06:34 pm
An Image moment is a number calculated using a certain formula. Understand what that formula means might be hard at first. In fact, I got a lot of questions about moments from the tracking tutorial I ...
The OpenCV 2 Computer Vision Application Programming Cookbook 16 Jun 2011 | 06:34 pm
The good people at Packt Publishing sent me a copy of OpenCV 2 Computer Vision Application Programming Cookbook, by Robert Laganiere. I’ve been reading it for a few days now, and here’s my take on the...
A super fast thresholding technique 1 Jun 2011 | 03:26 am
In computer vision, thresholding is probably the most basic operation. It needs to go through every single pixel of every single frame to detect objects. If you can make it efficient, you’ll have CPU ...
The Sobel and Laplacian Edge Detectors 24 Apr 2011 | 09:18 pm
Detecting edges is one of the fundamental operations you can do in image processing. It helps you reduce the amount of data (pixels) to process and maintains the “structural” aspect of the image. We’l...
Predator: Tracking + Learning 1 Apr 2011 | 07:05 am
Researcher Zdenek Kalal has come up with a system that can quickly learn how to track objects in a video stream. The demo is quite interesting. The related papers are mentioned at the end of the video...
OpenCV Face Detection Visualized 21 Mar 2011 | 07:40 pm
This video visualizes the detection process of OpenCV’s face detector. The algorithm uses the Viola Jones method of calculating the integral image and then performing some calculations on all the area...
New statistical model of vision explains various pecularities 9 Feb 2011 | 10:15 pm
The human retina is made up of approximately 100 million light sensitive cells. This is enough to overload all neurons in the brain. So, people believed that the brain somehow reduced this information...
