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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

where 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?

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