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Computación y Sistemas

Print version ISSN 1405-5546

Comp. y Sist. vol.14 n.4 México Apr./Jun. 2011

 

Artículos

 

Una estrategia para la selección dinámica de características aplicada a la estabilización de secuencias de imágenes

 

An Strategy for the Dynamic Selection of Features Applied to the Stabilization of Image Sequences

 

Hugo Jiménez Hernández1 y Joaquín Salas Rodríguez2

 

Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada del IPN 1hugojh@gmail.com; 2salas@ieee.org

 

Artículo recibido en Marzo 10, 2010
Aceptado en Junio 11, 2010

 

Resumen

En este trabajo se presenta una estrategia para la discriminación entre las características pertenecientes a objetos fijos y móviles de una escena observada desde una cámara sujeta a vibración. Nuestra estrategia selecciona como características fijas aquellas que minimizan el error de la proyección de la homográfica entre las imágenes, siendo tolerante a oclusiones de regiones y cambios lumínicos en la escena. Una posible aplicación de este resultado es la estabilización de secuencias de imágenes. En una etapa experimental, utilizando distintos escenarios en exteriores, mostramos los resultados y evidencia que los niveles de precisión obtenidos son mejores, que los obtenidos por propuestas eficientes basadas en la selección aleatoria de características, tal como la de RANSAC.

Palabras clave: Selección dinámica de características, estimación de la homografía, método no supervisado.

 

Abstract

This work introduces an algorithm to discriminate between either moving or static features of a given scene as observed from a fixed camera, which is under the effects of vibration,. In our strategy, we select the features minimizing the registration error from one image to the next one. The process discards the features corresponding to moving objects and untrackable regions. The algorithm is applied to the task of stabilizing an image sequence. In our experiments, we benchmark our approach with several images sequences and match the results with a randomized strategy known as RANSAC.

Key words: Dynamic selection of features, estimation of the copying, unsupervised method.

 

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