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Listar por palabra clave "Camera calibration"

Mostrando ítems 1-17 de 17

3D image based modelling for inspection of objects with micro-features, using inaccurate calibration patterns: an experimental contribution

Percoco, Gianluca; Sánchez Salmerón, Antonio José (Springer Verlag (Germany), 2017-05)

[EN] In this report, the authors give a contribution to the study of the influence of inaccuracy of the shape and the position of calibration targets, on the accuracy of Photogrammetry in digitizing micro-features. In a ...
A review and analyses of plumb-line calibration

Lerma García, José Luis; Cabrelles López, Miriam (Wiley: 12 months, 2007)

[EN] Radial and decentring distortion parameters have long been reported as fundamental elements in camera calibration, especially in digital close range photogrammetry. This paper reports on an investigation for the ...
A System for In-Line 3D Inspection without Hidden Surfaces

Perez-Cortes, Juan-Carlos; Pérez Jiménez, Alberto José; Sáez Barona, Sergio; Guardiola Garcia, Jose Luis; Salvador Igual, Ismael (MDPI AG, 2018)

[EN] This work presents a 3D scanner able to reconstruct a complete object without occlusions, including its surface appearance. The technique presents a number of differences in relation to current scanners: it does not ...
Accurate calibration with highly distorted images

Ricolfe Viala, Carlos; Sánchez Salmerón, Antonio José; Martínez Bertí, Enrique (Optical Society of America, 2012)

Camera calibration is a two-step process where first a linear algebraic approximation is followed by a nonlinear minimization. The nonlinear minimization adjusts the pin-hole and lens distortion models to the calibrating ...
Calibración de cámaras y correspondencia entre vistas en un sistema multi-cámara de inspección de alimentos

Alcalá Jiménez, Ana María (Universitat Politècnica de València, 2020-10-19)

[ES] El presente trabajo pretende desarrollar un sistema rápido que permita trasladar puntos de una cámara a su posición en las vistas de otras cámaras. Las cámaras estarán en posiciones arbitrarias con el fin de tener ...
Camera 3D positioning mixed reality-based interface to improve worker safety, ergonomics and productivity

Muñoz García, Adolfo; Martí Testón, Ana; Mahiques, Xavier; Gracia Calandin, Luis Ignacio; Solanes Galbis, Juan Ernesto; Tornero Montserrat, Josep (Elsevier, 2020-01)

[EN] This research develops a new mixed reality-based worker interface for industrial camera 3D positioning, which is intuitive and easy to manage, in order to enhance the worker safety, ergonomics and productivity. An ...
Camera calibration under optimal conditions

Ricolfe Viala, Carlos; Sánchez Salmerón, Antonio José (Optical Society of America, 2011)

Different methods based on photogrammetry or self-calibration exist to calibrate intrinsic and extrinsic camera parameters and also for data pre- and post-processing. From a practical viewpoint, it is quite difficult to ...
Depth-Dependent High Distortion Lens Calibration

Ricolfe Viala, Carlos; Esparza Peidro, Alicia (MDPI AG, 2020-07)

[EN] Accurate correction of high distorted images is a very complex problem. Several lens distortion models exist that are adjusted using different techniques. Usually, regardless of the chosen model, a unique distortion ...
Detección Automática de un Patrón para la Calibración Automática de Cámaras

de la Escalera, Arturo; Armingol, José María; Pech, José Luis; Gómez, José Julián (Universitat Politècnica de València, 2010-10-08)

[EN] The number of applications that need to calibrate cameras is increasing. Present methods can calculate camera parameter in a semi-automatic way. Because of that full-automatic methods are being researched in order to ...
Determining image distortion and PBS (point of best symmetry) in digital images using straight line matrices

Herráez Boquera, José; Denia Ríos, José Luis; Navarro Esteve, Pablo José; Rodríguez Pereña, Jaime; Martín Sánchez, María Teresa (Elsevier, 2016)

[EN] It is impossible to take accurate measurements in photogrammetry without first removing the distortion in images. This paper presents a methodology for correcting radial and tangential distortion and for determining ...
Efficient lens distortion correction for decoupling in calibration of wide angle lens cameras

Ricolfe Viala, Carlos; Sánchez Salmerón, Antonio José; Valera Fernández, Ángel (Institute of Electrical and Electronics Engineers (IEEE), 2013-02)

In photogrammetry applications, camera parameters must be as accurate as possible to avoid deviations in measurements from images. Errors increase if wide angle lens cameras are used. Moreover, the coupling between intrinsic ...
Photogrammetric measurement of 3D freeform millimetre-sized objects with micro features: an experimental validation of the close-range camera calibration model for narrow angles of view

Percoco, Gianluca; Sánchez Salmerón, Antonio José (IOP Publishing: Hybrid Open Access, 2015-09)

The measurement of millimetre and micro-scale features is performed by high-cost systems based on technologies with narrow working ranges to accurately control the position of the sensors. Photogrammetry would lower the ...
Procedimiento completo para el calibrado de cámaras utilizando una plantilla plana

Ricolfe Viala, Carlos; Sánchez Salmerón, Antonio José (Universitat Politècnica de València, 2008-01-24)

[EN] Camera calibration is necessary to obtain 3D information from 2D images of a scene. Different techniques exist, which are based on photogrammetry or self-calibration. As a result of the calibration, the intrinsic and ...
Simple and precise multi-view camera calibration for 3D reconstruction

Pérez Jiménez, Alberto José; Perez-Cortes, Juan-Carlos; Guardiola Garcia, Jose Luis (Elsevier, 2020-12)

[EN] A precise calibration in multi-view camera environments allows to perform accurate 3D object reconstruction, precise tracking of objects and accurate pose estimation. Those techniques are of high value in the industry ...
The Influence of Autofocus Lenses in the Camera Calibration Process

Ricolfe Viala, Carlos; Esparza Peidro, Alicia (Institute of Electrical and Electronics Engineers, 2021-02-02)

[EN] Camera calibration is a crucial step in robotics and computer vision. Accurate camera parameters are necessary to achieve robust applications. Nowadays, camera calibration process consists of adjusting a set of data ...
Using the camera pin-hole model restrictions to calibrate the lens distortion model

Ricolfe Viala, Carlos; Sánchez Salmerón, Antonio José (Elsevier, 2011-09)

Camera calibration required the computation of camera pin-hole and lens distortion models. The lens distortion is estimated alone or together with the pin-hole model, by using some existing lens distortion non-metric or ...
Valoración de la fiabilidad de los resultados de calibrado de una cámara conociendo sus parámetros extrínsecos

Díaz Iza, Harold José (Universitat Politècnica de València, 2018-01-10)

In general, validation of a camera calibration process is based on the reprojection error calculated with the computed model. Given the coupling that exists between several parameters of the camera model, this error can ...