Dissertations / Ph.D. topic in Computer Science (working as lecturer) - Image Processing or Neural Networks [11]

Hi
I am praveen. I am working as lecturer in computer science department.
Please suggest me to select the Ph.D. topic in Computer Science relating to Image Processing or Neural Networks.
Which one is best one. Please guide me to choose any topic related to Image processing or Neural Networks.

I am confused to select the topic. Please suggest & give the guidelines.
Give me any URL's related to this. It is very much helpful. Give me solution as soon as possible.

My id is praveen_vmk