Blog of things

OpenCV baby steps 4: Building a HSV calibrator


So far we have taken small bits of OpenCV goodness and explored them independently. Today we are going to see how we can combine a few things together and build ourselves a small app that helps us convert a coloured image into its Hue, Saturation and Value equivalent, and then adjust the HSV range to isolate one or more colours in the image.

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Open CV Baby steps 3: Circle detection


So far we have seen how to install OpenCV and capture images from a video stream. Today we'll see how we can detect circles (or balls) in an image. Last year, the biggest challenge of PiWars was to be able to detect coloured balls kept on four corners of an arena and drive a robot towards it. Now I don't know if they will have the same challenge this year, however we can use this as a starting point to use a few more OpenCV tricks. Today we'll learn about how to use Hough transforms in OpenCV and how we can use it to detect balls in an image.

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Open CV Baby steps 2: Capturing video frames


In the introductory post we saw how to setup OpenCV on a Raspbian (Desktop) and run a small sample application to convert an image into greyscale. Today we'll see how easy it is to capture frames from a camera and write some text on to each frame and save them.

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Open CV Baby Steps 01: Installation


I always wanted to learn OpenCV, because it was a massive step up from my Computer Graphics theory class back in the University days. Also I dream that all my the pictures I have ever taken will one day be collated, indexed and searchable with context like place, scene, people in the image so on and so forth. So learning OpenCV is the natural first step towards that (no, I will not use a my images as training material for some corporate AI engine, I wear a tin-foil-hat, sue me!). Of course everything had to run off (one or more) RaspberryPi!

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PiWars 2018: Team Pi-O-Steer's day out


Finally managed to collate all the images from friends and family who had come along to PiWars 2018. Here's a glimpse of Team Pi-O-Steer's action packed day at PiWars 2018.

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Cost of building a robot for PiWars


This maybe a controversial topic and I fully expect to get panned for it, however, I thought I should write down what I spent on my PiWars bot (First time and in the Beginners category) for two reasons:

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