A handwritten checked or big square kids maths notebook contains horizontal(H) and vertical(V) lines. Removal of either one H/V lines are possible, that to with the loss of information.Again there are two difficulties faced at the (1)joints of H/V lines and (2) same/different handwriting / margin / checked lines color. Herewith attached a sample checked image without handwriting
Jiarong Hong
You can do a fft of the image and block the bright point corresponding to the frequency of the horizontal and vertical lines and then do an inverse fft. It takes 2 minutes to do this in imageJ.
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