Targetless image-based method for measuring displacements and strains on concrete surfaces with a consumer camera

Measurement of concrete strain through non-invasive methods is of great importance in civil engineering and structural analysis. Traditional methods use laser speckle and high quality cameras that may result too expensive for many applications. Here we present a method for measuring concrete deformations with a standard reflex camera and image processing for tracking objects in the concretes surface. Two different approaches are presented here. In the first one, on-purpose objects are drawn on the surface, while on the second one we track small defects on the surface due to air bubbles in the hardening process. The method has been tested on a concrete sample under several loading/unloading cycles. A stop-motion sequence of the process has been captured and analyzed. Results have been successfully compared with the values given by a strain gauge. Accuracy of our methods in tracking objects is below 8 μm, in the order of more expensive commercial devices.

Software for video-based multi-point frequency measuring and mapping

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Methods and algorithms for video-based multi-point frequency measuring and mapping

Software for video-based multi-point frequency measuring and mapping: http://hdl.handle.net/10045/53429

Software for "Realistic limits for subpixel movement detection"

Object tracking with subpixel accuracy is of fundamental importance in many fields since it provides optimal performance at relatively low-cost. Although there are many theoretical proposals that lead to resolution increments of several orders of magnitude, in practice, this resolution is limited by the imaging systems. In this paper we propose and demonstrate through numerical models a realistic limit for subpixel accuracy. The final result is that maximum achievable resolution enhancement is connected with the dynamic range of the image, i.e. the detection limit is 1/2^(nr.bits). Results here presented may help to proper design of superresolution experiments in microscopy, surveillance, defense and other fields.

Realistic limits for subpixel movement detection

Object tracking with subpixel accuracy is of fundamental importance in many fields since it provides optimal performance at relatively low cost. Although there are many theoretical proposals that lead to resolution increments of several orders of magnitude, in practice this resolution is limited by the imaging systems. In this paper we propose and demonstrate through simple numerical models a realistic limit for subpixel accuracy. The final result is that maximum achievable resolution enhancement is connected with the dynamic range of the image, i.e., the detection limit is 1/2∧(nr.bits). The results here presented may aid in proper design of superresolution experiments in microscopy, surveillance, defense, and other fields.

Seguimiento del Grado en Óptica y Optometría

En el marco del proyecto de Redes de Investigación en Docencia Universitaria 2014-15 de la Universidad de Alicante se creó, como en años anteriores, una red de trabajo formada por los profesores coordinadores de semestre y el profesor responsable de la Clínica Optométrica con el fin de realizar un seguimiento del Grado en Óptica y Optometría. Siguiendo el trabajo llevado a cabo en convocatorias anteriores, esta red de seguimiento ha prestado especial atención a la coordinación de las asignaturas de Optometría, presentes en todos los cursos, el Trabajo Fin de Grado y las Prácticas Externas. El elevado número de profesores involucrado en estas asignaturas, exige un mayor nivel de coordinación. Durante el desarrollo del curso académico se han recogido las sugerencias y propuestas realizadas a través de diferentes comisiones, así como a partir de las reuniones con el alumnado. Las comisiones que han participado son la Comisión de Grado, las comisiones de semestre y la comisión de garantía de calidad. El objetivo final ha sido optimizar el funcionamiento del título, tanto en la distribución de contenidos, como en las metodologías docentes y de evaluación de las distintas materias que componen el plan de estudios.