Tensorflow Captcha Solver

Solve image based captchas using Tensorflow neural networks. This demo was developed for the DAHO.AM Conference in Munich, 2017.

Getting started

Clone the repository:

$ git clone https://github.com/KarimJedda/dahoam2017.git

This guide was written for Mac users, but users might still find it useful.

Set up Python virtualenv

Create a new virtual environment:

$ virtualenv dahoam

Activate the virtual environment:

$ source dahoam/bin/activate

Check if the Python virtual environment is set up correctly:

$ which python
/Users/your-username/Development/dahoam2017/env/bin/python

Install dependencies:

$ pip install -r requirements.txt

Troubleshooting: Tensorflow could not be found:

Could not find a version that satisfies the requirement tensorflow==1.1.0 (from -r requirements.txt (line 51)) (from versions: )
No matching distribution found for tensorflow==1.1.0 (from -r requirements.txt (line 51))

If you encounter this error, try installing Tensorflow from the binary:

$ python -m pip install --upgrade https://storage.googleapis.com/tensorflow/mac/cpu/tensorflow-1.1.0-py2-none-any.whl

Linux or Windows users need to find another download link...

Generate captchas

Go to captchas folder:

$ cd captchas

Download SimpleCaptcha to the folder:

$ curl -O https://vorboss.dl.sourceforge.net/project/simplecaptcha/simplecaptcha-1.2-jdk1.5.jar

Extract SimpleCaptcha:

$ jar xf simplecaptcha-1.2-jsd1.5.jar

Run SimpleCaptcha:

$ javac Main.java && java Main

Train the neural network

Once you've generated the test data, go to the solver folder:

$ cd solver

Create the tensorflow records:

$ python captcha_records.py

Train the network (Note, that the training runs until you stop it):

$ python captcha_train.py

Evaluate the performance of the network:

$ python captcha_eval.py

Try to solve some captchas:

$ python captcha_predict.py

Everything working? Great! Go solve some captchas (on your own machine for developing purposes, 'f course).

Further info