One of key elements of the multi-touch user interface is to detect multi touch points in fast and robust way. This process is called the blob detection and has been implemented in many multi touch programming environments.
The technical details can be found at NUI group community and Multigesture.net. However, if you want to know the blob detection algorithm for multi touch without leaving your browser, following two blog posts might be helpful.
- Detecting blobs at the speed of light, play.blog2t.net: In this post, you can see a live show of the author’s blob detection algorithm.
- Blob detection, geekblog.nl
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