Perspective Fields for Single Image Camera Calibration

Figure 1. (A): a photo (credit David Clapp) with an off-centered principal point due to cropping. (B), (C): assuming traditional pinhole model with principal point at the center, as used by [10, 24, 29], there is no way to correctly represent both up directions (wrong in B) and horizon (wrong in C). (D): Our proposed Perspective Fields model correctly models the Up-vectors (arrows) aligned with gravity, and Latitude values (contour line: -π/2 π/2) with 0 • on the horizon. We can further recover camera parameters Roll -0.5 • , Pitch 1.7 • , FoV 64.6 • and principal point at × from the prediction.