How to use PS to remove the words and tables on the back of scanned tables?

Adjust brightness and contrast, 1, brightness can't be adjusted too much at a time? 2, the contrast is reduced, as shown in the figure, if the back is clear, then increase the brightness. The back will disappear. The curve is better, the key is that the parameters of the file can not be unified in batches, and it is best to achieve consistent results with brightness and contrast.