Please see http://wiibrew.org/wiki/Wiimote#IR_Camera for the complete capabilities of the Wii camera. The IR camera code was written based on the above website and with support from Kristian Lauszus.

This library is large, if you run into memory problems when uploading to the Arduino, disable serial debugging.

To enable the IR camera code, simply set ENABLE_WII_IR_CAMERA to 1 in settings.h.

This library implements the following settings:

• Report sensitivity mode: 00 00 00 00 00 00 90 00 41 40 00 Suggested by inio (high sensitivity)
• Data Format: Extended mode (0x03). Full mode is not working yet. The output reports 0x3e and 0x3f need tampering with
  • In this mode the camera outputs x and y coordinates and a size dimension for the 4 brightest points.

Again, read through http://wiibrew.org/wiki/Wiimote#IR_Camera to get an understanding of the camera and its settings.