sub image used for ocr has boreder noise whitened before detecting
sub image used for ocr has boreder noise whitened before detecting

gabrielPeart/SudokuResolv,gabrielPeart/SudokuResolv,hkpstc/SudokuResolv,hkpstc/SudokuResolv,gabrielPeart/SudokuResolv,hkpstc/SudokuResolv