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depth_image_proc register issue

I'd like to use the depth_image_proc pipeline to create point cloud xyzrgb using a RGBD camera. I calibrated rgb and ir camera and used image_proc to rectify them. Now I would like to register depth image to the frame of the rgb camera. All input topics are up - depth image, depth camera info, rgb camera info and the required tf is also there. The topics depth_registered/camera_info and depth_registered/image_rect are generated, but they are empty.

The question is why?

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