I have imported my photos to an iPad using the camera connection kit. How can I import these photos from the iPad into a Capture One 7 catalog?
You would have to copy them off your iPad and onto a computer. The iPad won't function as a "camera" for this purpose and it won't attach as an external drive. However, once copied off the iPad, you can just import the files into Capture One normally.
Caveat, I don't use Capture One, so I'm not thoroughly familiar with their import functions. I do know that Lightroom, in contrast, will show import options for attached iPhone and iPad devices, so if you're not see something like that in Capture One, then the method I described is how I would do it.