Two-step cross correlation-based algorithm for motion estimation applied to fertilizer granules' motion during centrifugal spreading

Abstract : Imaging systems are progressing in both accuracy and robustness, and their use in precision agriculture is increasing accordingly. One application of imaging systems is to understand and control the centrifugal fertilizing spreading process. Predicting the spreading pattern on the ground relies on an estimation of the trajectories and velocities of ejected granules. The algorithms proposed to date have shown low accuracy, with an error rate of a few pixels. But a more accurate estimation of the motion of the granules can be achieved. Our new two-step crosscorrelation- based algorithm is based on the technique used in particle image velocimetry (PIV), which has yielded highly accurate results in the field of fluid mechanics. In order to characterize and evaluate our new algorithm, we develop a simulator for fertilizer granule images that obtained a high correlation with the real fertilizer images. The results of our tests show a deviation of <0.2 pixels for 90% of estimated velocities. This subpixel accuracy allows for use of a smaller camera sensor, which decreases the acquisition and processing time and also lowers the cost. These advantages make it more feasible to install this system on existing centrifugal spreaders for real-time control and adjustment.
Type de document :
Article dans une revue
Optical Engineering, SPIE, 2011, 50 (6), pp.067002. 〈10.1117/1.3582859〉
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-00607938
Contributeur : Marie-Christine Nodot <>
Soumis le : lundi 11 juillet 2011 - 17:20:48
Dernière modification le : samedi 7 janvier 2017 - 01:00:29

Identifiants

Collections

Citation

Bilal Hijazi, Jürgen Vangeyte, Frédéric Cointault, Julien Dubois, Sébastien Coudert, et al.. Two-step cross correlation-based algorithm for motion estimation applied to fertilizer granules' motion during centrifugal spreading. Optical Engineering, SPIE, 2011, 50 (6), pp.067002. 〈10.1117/1.3582859〉. 〈hal-00607938〉

Partager

Métriques

Consultations de la notice

150