Hello everybody,
I'm doing some AR research and currently I stuck at determine the real coordinates (or longitude, latitude) of the object given it image on the preview screen. Basically I want to calculate the real 3D-cartesian coordinates of a point given it coordinates in the preview screen (when the user touch it). I know how to get the camera orientation (azimuth, pitch and roll), GPS position of the camera (longitude, latitude) and the focal length of the camera but don't know how to put all of these together. I searched through the internet but nothing really help me understand yet.
I really appreciate if someone could help me on this or point out some hints that I could look at.
Thanks.