ABC Transcription Tools - Scanning Sheet Music to MusicXML with "Sheet Music Scanner"
Demonstration (iPad screen capture with sound) of scanning a tune from "The Waltz Book 2" with "Sheet Music Scanner" for iOS, exporting the MusicXML file it created, then importing and playing the file using the ABC Transcription Tools.
You can also email or AirDrop the MusicXML file from the iPad/iPhone to use the file on a desktop system.
Sheet Music Scanner:
https://sheetmusicscanner.com/