How can i find intersection point of two detected lines?

Hi, I have a study on detecting the true point of intersection. I did it before with a control point selection tool but my results were not satisfied due to non-repeatibilty of test. Now, i need to find it without any human operation...I will be appreciate if you can answer me...Here is the sample image below:

Sample image

What i have done before...

[Image Analyst]

I have no idea what you're trying to find or do. Read this http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer and I'll take a look again tomorrow so see if it makes any more sense then.