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Since the pi_face_tracker package works with your laptop camera, it sounds like your msi star cam clip is not supported by the uvc_cam driver. You might try the camera_umd driver instead as follows. I see you are using ROS Fuerte so you can install the camera_umd package using the commands:

$ sudo apt-get install ros-fuerte-camera-umd
$ rospack profile

I have added a suitable launch file for this driver to the pi_face_tracker package. To get the update run the commands:

$ roscd pi_vision
$ svn update
$ rospack profile

You can now try this launch file with your msi camera which is probably /dev/video1 on your laptop. Assuming the camera is plugged in to a USB port, run the command:

$ roslaunch pi_face_tracker camera_node.launch device:=/dev/video1

Then test to see if you have an image by running the command:

$ rosrun image_view image_view image:=/camera/image_raw

If you do not see an image, it is possible you camera is not uvc-compatible. If you do see an image, you can try pi_face_tracker. Ctrl-C out of the image_view process then run:

$ roslaunch pi_face_tracker face_tracker_uvc_cam.launch