How to create a Geometry from an image ? help

Support Basics & Interface
1

Hi i am a compositor… new to blender…
does anybody have a tutorial about, how to create a geometry from an image…??also about UV Projection modifier… please

2

What do you actually mean by creating geometry from an image?
How to add a background reference image ?
How to make a 3d object from multiple photos ?
Be more specific
UV Projection modifier doc http://wiki.blender.org/index.php/Doc:Manual/Modifiers/Textures/UVProject