no disparity on output of stereo_image_proc [closed]

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Hi everybody, I am using prosilica stereo cameras of care-o-bot robot, recently we managed to use sync images, with triggered mode on one of cameras, so I can use stereo_image_proc without _approximate:=True filter.

but still have problem:

although I am getting both stereo/left/image_rect and stereo/right/image_rect topics with a throughput about 24Hz, not getting any stereo/disparity topic.

does anyone have any suggestion?

Regards, Reza,