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Image topics can be visualized using the "Image" view in rviz as described here and here. If the Image display does not offer any topics when clicking on the button at the far right of the "topic" row it might be the case that your camera driver is not running or not publishing images properly. If this is the case, it might make sense to first check if a image topic exists, for instance using

rostopic list

and (provided a topic exists) checking if anything is published on it:

rostopic echo [your_image_topic]

[your_image_topic] must be set to the approriate topic, like "/camera/image_raw" or whatever else you are using.