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Here is a bunch of possible traditional ways: https://lmgtfy.com/?q=sudoku+opencv&s=g

As for YOLO, this could work without finding additional rubbish if your training set contained not just plain numbers, but numbers inside squares and empty squares made of grid lines. It is quite unlikely that you will see many numbers in squares and empty squares somewhere around the sudoku grid. And, I believe, also a number of rubbish newspaper pages as negative examples. If that worked, it would save a lot of effort of traditional methods.

Here is a bunch of possible traditional ways: https://lmgtfy.com/?q=sudoku+opencv&s=g

As for YOLO, this could work without finding additional rubbish if your training set contained not just plain numbers, but numbers inside squares and empty squares made of grid lines. It is quite unlikely that you will see many numbers in squares and empty squares somewhere around the sudoku grid. And, I believe, also a number of rubbish newspaper pages as negative examples. If that worked, it would save a lot of effort of traditional methods.methods. If you decide to use YOLO, please let us know your results.

Here is a bunch of possible traditional ways: https://lmgtfy.com/?q=sudoku+opencv&s=g

As for YOLO, this could work without finding additional rubbish if your training set contained not just plain numbers, but numbers inside squares and empty squares made of grid lines. It is quite unlikely that you will see many numbers in squares and empty squares somewhere around the sudoku grid. And, I believe, also a number of rubbish newspaper pages as negative examples. If that worked, it would save a lot of effort of traditional methods. methods.

If you decide to use YOLO, please let us know your results.

Here is a bunch of possible traditional ways: https://lmgtfy.com/?q=sudoku+opencv&s=g

As for YOLO, this could work without finding additional rubbish if your training set contained not just plain numbers, but numbers inside squares and empty squares made of grid lines. It is quite unlikely that you will see many numbers in squares and empty squares somewhere around the sudoku grid. And, I believe, also a number of rubbish newspaper pages as negative examples. If that worked, it would save a lot of effort of traditional methods.methods. And you don't need no number classifier, as YOLO will do it all for you! Still, I am not sure it is going to be 100% accurate, which is crucial here...

If you decide to use YOLO, please do let us know your results.