ImageMagick remove background noise

问题

In order to be better prepared for the OCR process, I want to remove the background noise on my images(typically this is a scanned image).

This is the example:

Is there with magick.exe command any approaches how to remove the noise from the images like this? If so, could you please show an example.

UPDATED

I use ImageMagick-7.0.7-Q16 on Windows 10

回答1:

Use -connected-components in ImageMagick to reduce the noise. (Unix syntax)

convert \
3foBc.png -threshold 60% \
-define connected-components:verbose=true \
-define connected-components:area-threshold=5 \
-define connected-components:mean-color=true \
-connected-components 8 \
out.png

来源：https://stackoverflow.com/questions/47989687/imagemagick-remove-background-noise