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disparity image generation using prosilsica camera pair

i have used two prosilica cameras. first i have launched the driver for both the cameras. left driver and right driver. once both the cameras are working i have launched the node stereo_image_proc for generating the disparity image. but the disparity image window is empty. i have checked the topic as well the one which should hold the disparity image /stereo/disparity. the topic is empty. afterwards i have check the node connection using rqt_graph. its is showing three node : left_driver, right_driver, and stereo/stereo_image_proc. the prefix stereo is for the addition of namespace. the three nodes are not interconnected. should the node stereo_image_proc subscribe from the left_driver and right_driver node. if yes how am i supposed to do the connection.

if i launch only the stereo_image_proc node without the driver nodes it is showing

well with the driver node this error is not showing. so i guess the stereo_image_proc node is subscribing form the driver nodes. But the /stereo/disparity topic is empty and in the rqt_graph is also not showing the interconnection.

i do not know what i am missing and stuck in here.... thanks in advance..

disparity image generation using prosilsica camera pair

i have used two prosilica cameras. first i have launched the driver for both the cameras. left driver and right driver. once both the cameras are working i have launched the node stereo_image_proc for generating the disparity image. but the disparity image window is empty. i have checked the topic as well the one which should hold the disparity image /stereo/disparity. the topic is empty. afterwards i have check the node connection using rqt_graph. its is showing three node : left_driver, right_driver, and stereo/stereo_image_proc. the prefix stereo is for the addition of namespace. the three nodes are not interconnected. should the node stereo_image_proc subscribe from the left_driver and right_driver node. if yes how am i supposed to do the connection.

if i launch only the stereo_image_proc node without the driver nodes it is showing

[WARN] [1415813115.021826292]: The input topic '/stereo/left/image_raw' is not yet advertised
[ WARN] [1415813115.021923430]: The input topic '/stereo/left/camera_info' is not yet advertised
[ WARN] [1415813115.021964487]: The input topic '/stereo/right/image_raw' is not yet advertised
[ WARN] [1415813115.021984075]: The input topic '/stereo/right/camera_info' is not yet advertised

well with the driver node this error is not showing. so i guess the stereo_image_proc node is subscribing form the driver nodes. But the /stereo/disparity topic is empty and in the rqt_graph is also not showing the interconnection.

i do not know what i am missing and stuck in here.... thanks in advance..