TY - JOUR
A1 - De Francisco Ortiz, Óscar
AU - Estrems Amestoy, Manuel
AU - Sánchez Reinoso, Horacio Tomás
AU - Carrero-Blanco Martínez-Hombre, julio
T1 - Enhanced Positioning Algorithm Using a Single Image in an LCD-Camera System by Mesh Elements' Recalculation and Angle Error Orientation
Y1 - 2019
SN - 1996-1944
UR - http://hdl.handle.net/10317/9262
AB - In this article, we present a method to position the tool in a micromachine system based on a camera-LCD screen positioning system that also provides information about angular deviations of the tool axis during its running. Both position and angular deviations are obtained by reducing a matrix of LEDs in the image to a single rectangle in the conical perspective that is treated by a photogrammetry method. This method computes the coordinates and orientation of the camera with respect to the fixed screen coordinate system. The used image consists of 5 × 5 lit LEDs, which are analyzed by the algorithm to determine a rectangle with known dimensions. The coordinates of the vertices of the rectangle in space are obtained by an inverse perspective computation from the image. The method presents a good approximation of the central point of the rectangle and provides the inclination of the workpiece with respect to the LCD screen reference system of coordinates. A test of the method is designed with the assistance of a Coordinate Measurement Machine (CMM) to check the accuracy of the positioning method. The performed test delivers a good accuracy in the position measurement of the designed method. A high dispersion in the angular deviation is detected, although the orientation of the inclination is appropriate in almost every case. This is due to the small values of the angles that makes the trigonometric function approximations very erratic. This method is a good starting point for the compensation of angular deviation in vision based micromachine tools, which is the principal source of errors in these operations and represents the main volume in the cost of machine elements’ parts.
KW - Ingeniería de los Procesos de Fabricación
KW - Ingeniería Mecánica
KW - Image processing
KW - Position control
KW - Accuracy
KW - Micromachines
KW - Position compensation
KW - Inverse conical perspective
KW - Micromanufacturing
KW - Manufacturing systems
KW - Mechatronics
KW - 3313 Tecnología E Ingeniería Mecánicas
KW - 3315 Tecnología Metalúrgica
LA - eng
PB - MDPI
ER -