How are the camera parameters extracted from the input images?

[LPHFAQ]

Hi, when I ran this project I found it's cool that the camera parameters (including poses, angles, intrinsic) can be extracted and saved at the path "./test/dataset/c/". But I'm confused about the method of extracting camera parameters. I referred to your paper and found this part about camera parameters: Then I referred to the paper [9] "Accurate 3D Face Reconstruction with Weakly-Supervised Learning: From Single Image to Image Set", there are no descriptions about extracting camera pose and intrinsic. So could you explain how the camera parameters are extracted from input face images? (PS: I referred to the project codes but failed to understand how the camera poses and intrinsic are extracted, but I guess that camera parameters might be calculated from the 3dmm coefficient -- the pose of face? )