Remove black line/spot from a picture

hi, can anyone guide me on how to remove the black line above the words on figure 2.

I just want to have the image of the letter and number, if you can make the words darker it is better.

figure 1

figure 2

this is the code that i used to get from figure 1 to figure 2.

 %read image
 BW = imread( 'test20.jpg' )
 figure(1),imshow(BW),title('test');

 %adjust intensity
 BW = imadjust(BW,[0 1],[]);

 % - Read RGB image and convert to BW.
 BW = im2bw(BW) ;

 % - Build vectors of logicals targeting all-black rows/cols.
 colId = ~sum( BW, 1 ) ;
 rowId = ~sum( BW, 2 ) ;
 % - Make them all white.
 BW(:,colId) = 1 ;
 BW(rowId,:) = 1 ;
 % - Show result.
 figure(2), imshow(BW)