Equations in the paper

[Xianrui Luo]

Hi, I am not familiar with 3D projection, I wonder if there is any reference regarding to the equation 7 in your paper? I cannot find where to calculate $V_{proj}$

[Yunhan Zhao]

v_{proj} is just vector [0, 0, 1] and extract the last dimension (z axis) in the 3d point.

[Xianrui Luo]

Thank you for replying.