Reference : Caractérisation de jets agricoles par traitement d'images
Computer developments : Software
Life sciences : Agriculture & agronomy
Caractérisation de jets agricoles par traitement d'images
[en] Characterization of agricultural sprays by image analysis
De Cock, Nicolas mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Agriculture de précision >]
Massinon, Mathieu mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Agriculture de précision >]
Lebeau, Frédéric mailto [Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction >]
[fr] Granulométrie ; Goutte ; Buse agricole ; Diamètre médian volumique ; Analyse d'image ; Pulvérisation ; Ombroscopie ; Double exposition
[en] Volume Median Diameter ; Image analysis ; Particle tracking velocimetry ; Droplet sizing ; Droplet ; Agricultural nozzle ; Shadowgraphy ; Double exposure
[en] A digital image analysis algorithm is proposed as an alternative to established optical techniques such as Phase Doppler Particle Analyser (PDPA) or laser diffraction spectrometry (LDS) for the experimental determination of the size and velocity distributions of droplets produced by agricultural nozzles . The algorithm requires pairs of grayscale images acquired within a very short time for particle tracking in a backlighted arrangement. Spatial illumination heterogeneities are corrected by subtracting a mean background from each image. Droplets are then localized and sized. The algorithm accuracy is ensured by the rejection of out of focus particle using a focus parameter depending on gradient intensity at particle edges. Thresholds for in-focus particle selection were determined by studying the evolution of the focus parameter and the error on particle size measurement from images containing known size droplets at various distance of the object plane. Selected droplets are identified on both images of the pair for determining their velocities. Finally, drop size distribution is corrected to account for the uneven sampling probability caused by the volumetric method.
Researchers ; Professionals ; Students
Matlab R2013a with image processing toolbox

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