microscope 0 Optical E D interface -0 Reference camera and -USB L u --0 encoder ISAAbstract -In the geometrical metrology field, calibration of graduated scaies is performed by comparison of the scale under inspection against a length standard at specific intervals. The procedure can take a long time due to the human intervention as a part of an observation process at each measurement interval. For example, the calibration o f a scale of l m can be divided in intervals of lcm, which results in a process with around 100 measurements. This paper describes a fully automated measurement instrument used in the calibration of graduated scales. The instrument avoids the human intervention by means of computer vision hardware and software and automated control. The measurement acquisition is done in known length intervals by the accurate positioning of an observation device and then applying computer vision techniques in order to recognize the magnitude in the scale. The measurements are compared against those reported by the length standard to complete a caIibration chart. The system described here improves the overall performance in relation to the manual method.
Abstract.A method for graduated scale inspection using computer vision is proposed. We deal mainly with the lens distortion problem in the image acquire device due to its influence in the uncertainty of the graduated scale inspection process. This paper presents an algorithm for image correction by means of camera calibration and distortion compensation. The camera calibration method provides the ideal undistorted coordinates of the system using as input distorted images of a 2D calibration pattern. The distortion compensation stage is implemented using the ideal undistorted coordinates as an unwarped mesh. Then distortion compensation can be applied to any image acquired with the system, improving the inspection procedure. Test results using real data are presented. Also, we describe the image feature extraction approach used in order to automate the process.
Este trabajo presenta datos que caracterizan a un sistema de fallas normales lístricas en dominó, con arreglos sintético y antitético en el borde de lo que se presume es una cuenca tipo rift en el noreste de México. Los afloramientos se localizan dentro de las estructuras anticlinales La Gavia y Arteaga, en el Estado de Coahuila y paleogeográficamente en el borde oriental del Bloque de Coahuila. El análisis de tensores de paleoesfuerzos de estas fallas permite definir un vector de extensión σ3 perpendicular al borde del Bloque de Coahuila, en La Gavia dirigido ~0°/191°-193° y en Arteaga con dirección de σ3 ~0°/200°. Deformación en sedimentos suaves “no litificados” también está presente en la sucesión. El análisis estructural de las fallas y las estructuras sedimentarias en sedimentos suaves sugieren que estas deformaciones fueron sincrónicas al relleno de la cuenca y co-genéticas. Este sistema de fallas se restringe a un nivel estratigráfico específico, por lo que se sugiere que tiene un desarrollo contemporáneo con la sedimentación clástica de la Arcosa Patula y la Formación Carbonera durante el Cretácico Inferior. Se interpreta que la extensión que generó estas fallas y la deformación de sedimentos suave puede ser atribuida a diferentes causas: 1) Como consecuencia de esfuerzos tectónicos regionales durante extensión en un ambiente tipo rift, similar en las cuencas de Sabinas y del Centro de México; 2) A una pendiente acentuada de la cuña sedimentaria entre el Bloque de Coahuila y las cuencas durante rejuvenecimiento del relieve, o bien, 3) La combinación de los mecanismos enunciados.
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