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Start from two basic examples

1. mtmoncam

It just captures and displays videos from a web cam

2. mtcam

It processes very basic multi-touch blob positioning algorithm with videos from a web cam.
In order to make it run correctly, you have to specify two parameters (mtcam asks you the parameters)
 1) Graythreshold: it determines which areas to be regarded as touch blobs. it ranges from 0 ~ 1. Select appropriate value to match your web cam
 2) Filter Kernel Size: During the multi-touch tracking, MTMAT runs a simple mean filter.