1.This repository created in C# VS2013-x64, It contains the following function:

• merged characters segmentation algorithm according "The Robustness of “Connecting Characters Together” CAPTCHAs".
• Sauvola binarization
• OTSU binarization
• Iteration binarization
• Zhang-Suen skeletonization

2.The test data set is the TAOBAO CAPTCHA that composed of blue character and white background.