You would need to connect your phone, via USB, to the computer. From there you can locate the phone on your computer, and the folder where the images are. Then just move them as you would any file. If for some reason you cannot locate them, or don't have a USB to connect to the computer, you could then try the hard way, which is email them all to yourself. But that could take a while.
One other option to try, if you have a google account, would be to copy them to google through the Photo app on the phone (if your phone didn't come with it you can download it from the the google play site.)