Right now I use a DSLR to capture an 18MP RAW image of the negatives on my lightbox as shown here Light source suggestions
The issue is that the individual frames are not very high resolution. My concept for contact sheets is as follows:
Step1. Lay out the negatives on the lightbox
Step2. Enter data about the negative; when, where, film type, keywords.
Step3. Quickly capture the frames one at a time with a minimum of button presses (accept/reject). Next strip button would be useful so the app knows the contact sheet layout.
Step4. App creates a contact sheet (large jpg) that matches your negatives, with metadata embedded in the file.
Major advance over traditional darkroom methods or dslr capture would be that each frame would be exposed and colour corrected individually, getting over lighting and exposure differences on a negative.
Hope this concept works for others too…