Hey!
I would like to ask a question. I am using Aruco AR library, and I would like to define the coordinates of a marker. A part of my c++ code:
double x_t = -TheMarkers[0].Tvec.at<Vec3f>(0,0)[0];
double y_t = TheMarkers[0].Tvec.at<Vec3f>(0,0)[1];
double z_t = TheMarkers[0].Tvec.at<Vec3f>(0,0)[2];
To be honest I do not know what is the exact meaning of these lines. What I have so far figured out using stackoverflow and this site: (Let's see only the first line):
double x_t = -TheMarkers[0].Tvec.at<Vec3f>(0,0)[0];
TheMarkers[0]: the "0" index means that we want to inquire/get the first marker detected. It is clear.
Tvec: This is the 3D translation vector with x,y,z translation values. So how far is my marker relating to my camera coordinate system.
The next would be my first question: What does "at" mean at "Tvec.at"? I found an information on the internet about what does Vec3f mean: The Vec3f class provides a vector object for 3 dimensional locations or RGB pixel values.
After that the (0,0) part is also vague to me. Why should I use (0,0)?
The index at the end ([0]) is clear for me...
Thanks in advance for the answer!
