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Please make sure your remappings are setup right. From your rxgraph output it looks like the mono_odometer is only subscribed to the image_rect topic and not to the camera_info topic.

Using rosnode info mono_odometer you can have a quick look at the topic connections.

image_proc is designed to run in the camera's namespace:

<node pkg="image_proc" type="image_proc" name="image_proc" ns="/Dava/camera" />

This way you have all camera-related topics together:

  /Dava/camera/image_raw
  /Dava/camera/camera_info
  /Dava/camera/image_rect
  /Dava/camera/image_mono
  ...

Hope that helps!