问题:

Well tried morphology in Imagemagick, but unfortunately the output also affects the text, thus making it unsatisfactory for ocr. So is there any faster way to remove the lines from image without affecting the text for ocr?

Input image:

Imagemagick code:

magick 1sa.jpg -morphology close:1 "1x4: 0,1,1,0" result.png

Output image

Edit: Thanks to all those who replied. I finally made it work by the following code:

magick E:\1sa.jpg ( +clone -threshold 50% -negate -statistic median 219x1 ) -compose lighten -composite E:\z1.jpg

回答1:

Your ImageMagick command is erroneous and should not even work. You need to make the kernel a horizontal line not vertical and you need a longer line for the kernel. Try the following:

magick 1sa.jpg -morphology bottomhat "20x1:0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0" -negate result.png

Adjust the kernel length as needed to optimize your result.

回答2:

Is this ImageMagick command any better in the result?

convert 1sa.jpg -morphology bottomhat "20x3:0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0" -negate result.png