How to delete imported photos.

I used an SD card IPad accessory to import photos from my camera but the photos automatically go into the 'imported photos' album as well as the 'recently imported' album. I then tried to move them all into category albums ( summer, autumn, winter etc) but instead of moving them out of the 'imported photos' album it just made another copy to put in my new album. Now I have 2 or 3 copies of the same photo!!! (Not to mention photo stream and photos have copies as well!)

I wish to know how I can delete these photos but only from 'imported photos' album and 'recently imported' album without deleting them from the albums I wish to keep. It's taking up lots of space on my ipad and is extremely unnecessary for me!