Stories from the land of Rob

On saturday I decided to have a bit of fun hacking, so I got out my wiimote and decided to hack on some 3d gesture recogition.. There’s a great little library called libcwiid that allows an application to talk to a wiimote, with full access to the accelerometer (x,y,z force, roll, yaw) and the ir sensor. It also comes with a nice gui (wmgui) that shows you everything in real time. So far so cool.

There’s also a nice project called wiigee that was written in conjunction with a paper (ACM access required) by a group at the University of Oldenburg. This uses a k-mean quantizer, a left-right hidden Markov model and a Baysian classifier to recognize and classify gestures in a 3d space. Downside is that it’s in Java, and I want something small and fast in C.

So, I decide, lets see how hard it is to port some java code to vala… and yeah, takes me about an hour (including learning vala…) to covert the HMM. I then noticed some slight inefficiencies in vala’s generated code for accessing field members, so hacked a patch to vala for that. The HMM code also uses a lot of multidimensional arrays, and vala doesn’t yet support getting the array dimensions of an existing array, so today I finished a patch to add support to vala for this. All in all vala is a pretty nice language and valac itself is not hard to hack on!

Next up, I’m gonna finish porting wiigee to vala and come up with some fun demos
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