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2012-10-04 08:28:48 -0500 commented question initialize but topics are empty

For, rostopic info /camera/rgb/image_raw, /camera_nodelet_manager, is the publisher with no subscriber, but when I use rostopic echo, there are no messages being published.

2012-10-02 07:33:31 -0500 received badge  Popular Question (source)
2012-10-01 06:50:48 -0500 asked a question initialize but topics are empty

I am using fuerte in ubuntu 12.04.

Whether I use roslaunch openni_launch openni.launch or rosrun openni_camera openni_node I get the following output:

[ INFO] [1349109695.908019815]: Number devices connected: 1
[ INFO] [1349109695.908117225]: 1. device on bus 003:26 is a Xbox NUI Camera (2ae) from Microsoft (45e) with serial id 'A00364903898050A'
[ INFO] [1349109695.909604011]: Searching for device with index = 1
[ INFO] [1349109695.951698285]: Opened 'Xbox NUI Camera' on bus 3:26 with serial number 'A00364903898050A'
[ INFO] [1349109695.983343985]: rgb_frame_id = '/camera_rgb_optical_frame' 
[ INFO] [1349109695.983442622]: depth_frame_id = '/camera_depth_optical_frame'

When I use rostopic list I can see all the topics:

/camera/depth/camera_info
/camera/depth/disparity
/camera/depth/image
/camera/depth/image/compressed
/camera/depth/image/compressed/parameter_descriptions
/camera/depth/image/compressed/parameter_updates
/camera/depth/image/compressedDepth
/camera/depth/image/compressedDepth/parameter_descriptions
/camera/depth/image/compressedDepth/parameter_updates
/camera/depth/image/theora
/camera/depth/image/theora/parameter_descriptions
/camera/depth/image/theora/parameter_updates
/camera/depth/image_raw

...

/camera/rgb/image_rect_color/theora
/camera/rgb/image_rect_color/theora/parameter_descriptions
/camera/rgb/image_rect_color/theora/parameter_updates
/camera/rgb/rectify_color/parameter_descriptions
/camera/rgb/rectify_color/parameter_updates
/camera/rgb/rectify_mono/parameter_descriptions
/camera/rgb/rectify_mono/parameter_updates
/rosout
/rosout_agg
/tf

But all the topics are empty, there is no information being published

Can someone please help me?