6 replies to this topic

[wpanther93]

Hey all,

I was recently reading about breaking captchas and ocr, and since I know there are some talented programmers here I thought I would ask if you guys knew anything about it.
I'm proficient in python, c, and java. I've already figured out some easy algorithms to filter out color and flesh out letters using python and the image library.
Anyone have experience with this? I'm just kind of shooting in the dark.

[Noitidart]

Im not so experiences but others are. What exactly are you looking for in this topic?
If you post up some examples of what you're trying to crack we could guide you.

[Hydrogen]

If you are into Python, check out the Python Imaging Library: http://www.pythonware.com/products/pil - It's a great way to get started with image manipulation and it's what we use at Codex .

[Pyro699]

If you are into Python, check out the Python Imaging Library: http://www.pythonware.com/products/pil - It's a great way to get started with image manipulation and it's what we use at Codex .

Beware on x64 systems though, its a bitch to get going...

[sLAUGHTER]

Well I'm not sure about other ones, but the neo captcha is basically:

• Break down the image into colors using getpixel or something...
• Find the darkest pixel
• Darkest pixel = pet.

If that doesn't work, create a map of each with no neopets on it, then compare and find differences in pixels and colors.

[Hydrogen]

Well I'm not sure about other ones, but the neo captcha is basically:

• Break down the image into colors using getpixel or something...
• Find the darkest pixel
• Darkest pixel = pet.

If that doesn't work, create a map of each with no neopets on it, then compare and find differences in pixels and colors.

Not to brag about Codex, but we've found a better method that has a much higher success ratio than that method .

[sLAUGHTER]

Well, so do have I, breaking the image down even further, but this is the less-strenuous version.