Valdés Morales, AntonioRonda Prieto, José Ignacio2023-06-202023-06-202005-030924-9907 (Print) 1573-7683 (Online)https://hdl.handle.net/20.500.14352/52266We study the geometric object given by the set of lines incident with the absolute conic. We see that this object is given by a pencil of quadrics of P5, which is characterized. We describe some of its most relevant properties for the camera autocalibration problem. Finally, we illustrate the applicabil- ity of the theory proposing a linear algorithm for the metric upgrading of a projective calibration of a set of ten or more cameras with varying parameters and known skew and aspect ratio.engjournal articleopen accessInteligencia artificial (Informática)1203.04 Inteligencia Artificial