This is a simple control to ensure that you are a human being and not a nasty little program that automatically queries the directory.
I am aware that a few others have come up with small hacks to bypass this or to search through the directory by other means, so this is not what this post is about.
I simply wanted to check how well this captcha control is doing its job in fulfilling its purpose. The object is to challenge so that only a human is able to read and enter the text.
However, using two very simple tools, it is possible to automate the process of identifying the text without the use of a human.
This can be done in two simple steps, 1) perform a simple threshold to get rid of the noise and 2) use an OCR engine to read the text