Lazy Loader thinking

This is just me thinking out loud, but if the Browser component can read and show and calculate the scrollY.offset, the viewport.height, and the document.height by default, then if I can get the Y position of any image on my page or use the same technology behind the Inview Animations then surely it should be quite simple to create my own Lazy Loader for my images?

Any guidance on this would be greatly appreciated. My normal Lazy Loader code and ideas can be found here.