In this paper we discuss, study and compare two linear algorithms for the triangulation reÿnement problem: the known longest-side (triangle bisection) reÿnement algorithm, as well as a new algorithm that uses longest side bisection techniques for reÿning Delaunay triangulations. We show that the automatic point insertion criterion, taken from the fractal property of optimal (linear) longest-side bisection algorithms, assures the construction of good quality Delaunay triangulations in linear time. Numerical evidence, showing that the practical behaviour of the new algorithm is in complete agreement with the theory, is included.

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El presente trabajo analizó el costo y rendimiento de una faena de raleo bajo un criterio de manejo silvopastoral en una plantación de 18 años de P. ponderosa ubicada en la comuna de Coyhaique, Región de Aysén de Chile. Se realizó un estudio de tiempo y rendimiento de las principales actividades asociadas al sistema de cosecha forestal tradicional (no mecanizado), para determinar productividad y costos de la faena y generar información para futuros instrumentos de fomentos de la actividad de manejo de plantaciones forestales

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In this paper, a real-time tracking/synthesis loop is proposed to animate the eye texture of a 3D head model using a video camera. The user's eyes, captured by a video camera, are tracked by means of a frame-rate pupil detector technique, based on an active illumination scheme. A small area of interest is selected around each pupil detected in the video. These areas contain the eye and eyebrow features. Substituting the captured areas on the texture of the 3D model, animation of the eyes and eyebrows is created. To avoid the 'collage' effect, the extracted areas are colour-corrected, stretched and blended with the texture.