I have a few doubts regarding the Image targets QCAR application on android. I have created an image trackable through the QDevNet website. I have another image which differs only in color from the first image. I haven't created any trackable out of this. yet this image gets recognized when I run the application and track this. I have a third image which in quite different from 1 and 2, except that the x,y coordinates of the 3rd image is quite similar to 1 and 2. Even this gets recognized ( I haven't created a trackable for this one either). So here is my doubt :-
1. How many features(or points) are actually required for the recognition of 2 images that are different in color.
2. How can an image that is different in color but similar in x and y coordinates match with the trackable?