how to gate top view of some part of image /

i am new in matlab. if i take image from camera. (fig 1)

 if i have to take top view of some part(fig 2) of image using matlab..how to do programing for that...plz help me..

the size of image doesn't matter only top view like this is required (fig 3)

Answer 1

[Image Analyst]

Somehow you have to have robotics to move the camera. MATLAB can control the robot. Do you have some DLL to communicate with your robot?

[AMIT]

can i do it via image projection technique ? ortho or perspective projection

[Image Analyst]

You can warp the image but it won't be the same as if you had an overhead shot of the scene. It's best to actually physically move the camera. Why can't you do that?

To "fake" it in software, use imtransform(), which, like I said, is not the same thing because all it does is warp the image. The Computer Vision System Toolbox has routines for camera calibration, if you need that.

[AMIT]

how to do that ? give me any help for that ...

[Image Analyst]

Here's a discussion: http://blogs.mathworks.com/steve/2006/08/04/spatial-transformations-defining-and-applying-custom-transforms/