object recognition on windows standalone app

Hi. I'doing a windows standalone application for a IR touchscreen and i need to add object recognition support. I need to recognize the size, or shape, of an object that users put on screen. Normally i use the touchscript assets to add multitouch events but i'm not closed to this requeriment. I know that the touchscreen has this information because i have test other apps, did on directx and c++, that recognize size and it works with no problem. But i dont know how to receive this information from unity.

Thansk you.