Humberto Loaiza

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Infrared thermography is a nondestructive evaluation technique in which the specimen surface is thermally stimulated to produce a temperature difference between "sound" (free of defects) areas and eventual defective regions. It is well known that the thermographic methods based on the thermal contrast are strongly affected by non-uniform heating at the(More)
In this paper, a technique based on a new model from finite differences discretization of Fourier heat propagation in 3D, is presented in order to be applied on a sequence of infrared images to enhance contrast and automatically detect and characterize flaws in composite slabs. The performance of this technique is evaluated using artificial thermal(More)
Many applications of Colour Image Processing have problems with changes of the illuminant, in this work we present some contributions to the research line called Computational Colour Constancy that could provide solutions to those problems. Colour Constancy is the ability through which colour perception remains almost constant despite changes in the(More)
We present a comparative study about stereoscopic reconstruction process focused in modelling for parallel axis stereoscopic cameras. We used two classical models and one based on Artificial Neural Networks for modelling the parallel axis system. Then we used the root mean square of distances between the point coordinates calculated from images and measured(More)
This paper presents a system for automated 3D reconstruction of unorganized RGB-D images. Our algorithm is based on image feature matching and graph theory. We use a multiple-view registration scheme based on graph connectivity in order to reduce propagation errors found in motion. We estimate motion between two-views with 3D points back-projected from(More)
Resumen—En este artículo se presentan los resultados obtenidos, al emplear algoritmos genéticos para la combinación de algunas técnicas y clasificadores utilizados en el reconocimiento de rostros con imágenes infrarrojas. Se muestra que bajo el esquema de combinación propuesto, el sistema presenta un mayor desempeño que las técnicas individuales y abre un(More)
con ultrasonido. En el presente artículo se propone entonces un sistema de procesamiento de señales ultrasónicas captadas a través de una estructura de 2 Transmisores y 2 Receptores, de tal manera que extrayendo diferentes características del espacio temporal, de los espectros de Fourier y de los coeficientes Wavelet, eligiendo las más adecuadas mediante(More)