Sometimes a picture to be restored is too large for the scanner.
These large pictures can often be can be scanned in overlapping panels and stitched together in the computer. The process is sometimes referred to as "Quilt Scanning".
The process can be simpler than stitching a panorama because the picture can be aligned along the scanner edges as a guide.
This example was scanned in three perfectly aligned panels and stitched together. Then the visible artifacts were removed, the brightness and contrast adjusted, and a new background created.