How to improve this one?

I tried to solve this captcha(http://gsxt.hnaic.gov.cn/VerifierImage.jpg) with following filters, but the result is bad. The accuracy is less than 5%.
image

-scale 200%
-threshold 50%
-remove-dust 2
-remove-objects 30
-segment 50

How to improve it? Thanks a lot.

Comments

  • SvenSven www.GSA-Online.de
    got a 50% success rate with just the Max / min filters...will add that on next release. Can probably improve success rate much further.
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