How to detect image in document

Hello,I want to write a matlab code to detect images in a document.the document contains images and texts.can anyone help me to do it?

[John D'Errico]

Please don't post the same question three times.

This is your homework, your project. Make an effort. You will learn by doing, not by being given the answer. Once you try something, then ask a question if you have a problem, and you will likely get an answer then.