This depends on:
- what a "fisheye image" is. An image of an eye of a fish? Or a photo taken through an fisheye lens printed to paper? Or an image file with the parameter of the lens stored in the EXIF data?
- what you want to achieve: Encrypt the image, distort it, rotate it, register certain parts of the eye (when you mean images of real eyes)?
So please add more details. Prefer editing the original question, because this is the location where readers expect all required details. Posting important information in a comment or pseudo-answer is less useful.
