harder, better, faster, stronger... techniques an image-based captcha?


there lots non-image-based captcha ideas floating around. nonetheless prehistoric way?



what elements good settlement captcha? visible elements tough computers, nonetheless easier humans? mistakes, elements easier computers humans? good techniques augmenting speed captcha generator?



here's an instance capcha i've operative on. generates functions twin sine waves, following stretches calm between them. lays over credentials drawn pool images.
image-based captcha



how improved? (specifically, i'm controlling php gd.) things mind are:




  • change tone text, presumably origination multicolored.

  • add "scratches" outlines softly mysterious text.

  • add duplicity it's influenced sine waves horizontally well.



what goes glorious settlement captcha?





edit:
i know there unequivocally excellent third-party captcha resources. i'm looking attributes make good. i'd possess captchas, only purpose self-improvement. so, pronounce recaptcha, nonetheless it's accurately i'm looking for.



also, brought adult wholly image, nonetheless also experience matters, feel giveaway critique that.



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