There is no direct way to register your image using Google Earth. One simple way is to save the image as any format such as JPG. It is preferable to save it with grid and without grid, one for use in collecting reference point (with grid) and the other is the one to register. I recommend to download latest version of QGIS it is an open source free of charge software which you can use in the registration process.
http://www.qgis.org/en/site/
Version 2.18.12
Please note that there are many ways to save a large image from Google Earth one way is explained in the following site
Can you please give more details about GE engine e.g. you select an algorithm for classification of a selected area than you get the classification results. Is this how it work please correct me or expatiate the subject thank you.