I hear and I forget. I see and I remember. I do and I understand. — Chinese Proverb


OCR Dhiraagu E-Directory Captcha with ImageMagick and tesseract-ocr

Dhiraagu E-Directory requires you to enter the Captcha text from the randomly generated image before it searches the directory.

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

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By Ahmed Ibrahim

Today the software development landscape has evolved significantly with the proliferation of Web technologies. Thus a majority of applications developed have some form of connectivity or integration with another application, web service, web application, remote database, etc.

This article will therefore try to touch one specific area, which is HTML content and DOM. And in doing so will investigate two approaches available in .Net which can be used to fuse these two for some practical purpose.

Examples provided are based on .Net code and libraries. However, the concepts remain the same for HTML and DOM are independent from any programming language. This article is not exhaustive in any manner however references are provided for those seeking a more in depth coverage.

Demo Application Screenshot

Full Article on Code Project…