I'm afraid that's not possible. If you encoded a proper video DVD from your photos, they're now all part of a MPEG-2 motion video file and not individual images anymore. The images would be resized to standard TV resolution, which is very small compared to the resolution your original digital photos probably had, and are subject to strong intraframe and interframe compression, possibly with some effects, decorations and text titles encoded on top of them. You could only try to use the function to extract single frames, which is e.g. available in Movie Edit Pro, to get images files again. However, they wouldn't be anywhere near the quality of your original photos. Sorry.  :-(