I am currently reading a book titled "Learning OpenCV 3 Computer Vision in C++ with the OpenCV Library", and I come across these two equations:
xscreen = fx*X/Z + Cx
yscreen = fy*Y/Z + Cy
fx = F · sx and
fy = F · sy
It says that sx is the of the individual imager elements but I can't really imagine it. Anybody can explain it to me?