A view camera is handy for a real life ("meat space") photographer, since it allows distortion-free photos to be taken from the real life photographer's normal camera position, namely five to six feet above the ground. Virtual photographers have no such restrictions. Our cameras can be mounted on top of virtual fifty-foot poles if necessary, to get the same result. View cameras are unnecessary in 3D graphics. :)

For correcting an already distorted image, Les'  technique will work, at least at a quality level which is adequate for backgrounds. I haven't tried it for anything close-up, but given the likely reason for the distortion occurring in the first place, that probably wouldn't be a problem.