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I finally found the solution. what I should have in the launch file for the remapping of the image should be :

<remap from="image" to="depth/image_raw"/>

This way it works and the /scan topic is being published correctly.

I finally found the solution. what I should have in the launch file for the remapping of the image should be :

<remap from="image" to="depth/image_raw"/>

So it was the namespace which was not correctly set. This way it works and the /scan topic is being published correctly.

I finally found the solution. what I should have in the launch file for the remapping of the image should be :

<remap from="image" to="depth/image_raw"/>

So it was the namespace / which was not correctly set. causing the problem. This way it works and the /scan topic is being published correctly.