[pequnp]

For accessing SmartDashboard, just extend the WPICameraExtension class provided in the jar in the SmartDashboard extensions directory.
Then just override the processImage(WPIColorImage rawImage) method. The only real change you'll need to make code wise is to figure how you want to output the data to SD. When you're done, compile your widget into a jar and place it in the extensions directory. I'm sorry, but I don't have good example code of this.