(ii) Structure Sensor
The Structure Sensor is an Infrared sensor system and it is sensor only, so it has to be connected with an iPad which has SDK app running and available processor and memory for processing raw sensing signal collect by the sensor. After tested several different SDK app, we chose to use  the "Room Capture" SDK package for its convenience. So the iPad camera captured the targeting curb using scalable images during the scan.  It was an important reference for our scanning results.