Carballeira, PabloRonda Prieto, José IgnacioValdés Morales, Antonio2023-06-202023-06-2020081522-4880https://hdl.handle.net/20.500.14352/5050015th IEEE International Conference on Image Processing (ICIP 2008), OCT 12-15, 2008, San Diego, CAWe present new algorithms for the recovery of the Euclidean structure from a projective calibration of a set of cameras with square pixels but otherwise arbitrarily varying intrinsic and extrinsic parameters. Our results, based on a novel geometric approach, include a closed-form solution for the case of three cameras and two known vanishing points and an efficient one-dimensional search algorithm for the case of four cameras and one known vanishing point. In addition, an algorithm for a reliable automatic detection of vanishing points on the images is presented. These techniques fit in a 3D reconstruction scheme oriented to urban scenes reconstruction. The satisfactory performance of the techniques is demonstrated with tests on synthetic and real data.engjournal articlehttp://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4711727http://www.ieee.org/restricted access004.83D reconstructionautocalibrationabsolute conicisotropic linevanishing pointprojective geometryInteligencia artificial (Informática)1203.04 Inteligencia Artificial