Paralelni Polis is three storey building with no insulation whatsoever. Our gas consumption is so big, that last year our gas bill reached the sky, and we got disconnected. This is the reason why we need keep an eye on our gas usage.
Camera board has normal USB webcam glued on the front side with few LEDs to light up the scene. Flexible camera stand is used to adjust camera view.
This is how board looks like from the back. On the left side you can see Odroid, WiFi dongle and USB memory stick. That's where SimpleCV does its magic. In bottom corner sits voltage regulator which makes 5V out of 12V for Odroid. And a lot of LEDs. Just to make the back cover look pretty.
And that's how everything looks in place. Camera is positioned slightly above the gas meter, to prevent reflections from LEDs. Back cover was designed and printed by MakersLab is light up by many LEDs you can see on previous the image.
This is image taken by the camera. That's where computer vision fun begins. In corners you can see orange stickers which helps us to find the counter, area we are interested in.
We just look for orange blobs desired size. It's easy to find our stickers on the image.
Knowing where the corners are, we can resize the counter to a rectangle of known size.
Now we know that our digits are in particular location of the image.
With a little bit of magic, we can crop digits from the image. Digits are roughly 50x150px big and similar to MINST dataset. Digits recognition uses LinearSVC from Scikit.
This was my first project with SimpleCV and I fell in love with this library.
Its API is really simple and easy to use and you don't need to have ten PhDs to understand it.
I tried to document the code as much as possible, feel free to use it for whatever you want.
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