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It's an example of removing the staves on an unskewed image. That's why the first stage of "setting up" would be "straighting out" the picture. It is important because a difference of even 2-3 pixels on the different ends of the line could cause us some serious problems later on.



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Removing the staves could be quite complicated because while getting rid of the staves one should be careful not remove all the different musical symbols (look at the picture above). However, no matter how careful a person may be some damage will be done and after the staves are gone it will necessary to restore damaged musical symbols.

The principle of removing the stave lines:

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