New high speed image acquisition system and image processing techniques for fertiliser granule trajectory determination

B. Hijazi; F. Cointault; J. Dubois; S. Villette; J. Vangeyte; F. Yang; M. Paindavoine

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New high speed image acquisition system and image processing techniques for fertiliser granule trajectory determination

in Precision agriculture '09

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B. Hijazi

B. Hijazi
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F. Cointault

F. Cointault
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J. Dubois

J. Dubois
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S. Villette

S. Villette
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J. Vangeyte

J. Vangeyte
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F. Yang

F. Yang
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M. Paindavoine

M. Paindavoine
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Art:: Kapitel

Seiten:: 639–647

DOI:: https://doi.org/10.1163/9789086866649_077

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Abstract

Since the beginning of the 90’s, the problem of the environment became crucial, particularly in term of soil fertiliser use. In Europe, approximately 85% of fertiliser are distributed using centrifugal spreader, due to their relative low cost, simplicity and robustness. Numerous research have been done on the understanding of the spreading process from the vane to the soil, using optical or imaging systems. In order to predict the fertiliser deposition on the soil using a ballistic flight model, several parameters need to be determined, notably the velocity of the granules (about 35 m/s) when they leave the spinning disc. This paper presents improvements of previous high speed imaging systems developed at Enesad and ILVO Institute. New stroboscopic approach is first proposed using power-Leds located 1m height around the digital camera, which avoid the problem of illumination changing due to flashes which could not have exactly the same characteristics. This apparatus is piloted with a FPGA card specifically dedicated to our application. Multiexposure images acquired are then treated with Gabor filters method, alternative to previous method based on Markov Random Fields (MRFs). Results obtained on simple and synthetic images are very good but the first tests on real images of ejected granules give no significant information due to the particular motion of the fertiliser, bound to centrifugal force and small displacement. The use of specific intercorrelation method allows us to obtain quite similar results to the use of MRFs technique, with the need of a motion initialisation. We are currently comparing the two previous methods in different ejection cases. We have however proved that the special motion of the fertiliser granules could not be determined with classical motion estimation methods.

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Precision agriculture '09

ISBN:: 9789086866649

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 01 Jan 2009

Fachgebiete
- Biowissenschaften
  - Allgemein
  - Landwirtschaft und Umwelt

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New high speed image acquisition system and image processing techniques for fertiliser granule trajectory determination

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Precision agriculture '09

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