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Have you tried the following in your terminal:

To print the contents of one message on screen (ctrl-C to interrupt):

rostopic echo -n 1 /camera/image_raw

To check the bandwidth used by the topic:

rostopic bw /camera/image_raw

To check the frequency of publishing:

rostopic hz /camera/image_raw

Another thing you can do, after starting image_view like this:

rosrun image_view image_view image:=/camera/image_raw

is to open another terminal and typing

rxgraph

This should show if image_view is actually subscribing to the topic. Assuming that the previous rostopic tests revealed that data is in fact being published on the topic. As a last resort:

roswtf

If no data is being sent to the topic, there could be something wrong with the camera driver.