Dan Tait created a Visual Sudoku Solver app where users can solve Sudoku puzzles by just pointing their camera at them. The app utilizes computer vision and machine learning for this purpose. It is advised to ensure even lighting, hold the camera directly above the puzzle, and make sure the puzzle is in focus for best results. However, there are known issues with the app such as trouble recognizing the grid and occasional errors in reading parts of the puzzle. The app is not perfect but was created for learning purposes. If interested, more information on how it was built is available on Github.
https://sudoku.dotslashdan.com/