Single View Metrology Along Orthogonal Directions

In this paper, we describe how 3D metric measurements can be determined from a single uncalibrated image, when only minimal geometric information are available in the image. The minimal information just is orthogonal vanishing points. Given such limited information, we show that the length ratios on different orthogonal directions can be directly computed. The exciting discovery of the method seems to oppose common senses: Usually, in the calibration process, all edge-lengths of cuboid are known, in this paper, cuboid edge-lengths are unknown but its edge-lengths ratios can be recovered from image. 3D metric measurements can be directly computed from the image using our linear method.