Unpublished conference/Abstract (Scientific congresses and symposiums)
Leaf area and leaf orientation measurement by using stereo-vision
Leemans, Vincent; Dumont, Benjamin; Destain, Marie-France
2013International Workshop on Image Analysis Methods for the Plant Sciences
 

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Keywords :
LAI; 3D; plant leaf area; ALA
Abstract :
[en] This paper presents a 3D stereo-vision system aiming at the measurement of plant characteristics. The method is intended to be used in an Ecotron where the availability of plant material is limited and where crop should be characterised non destructively. The plants were not considered as individuals, it was the crop as a whole that was characterised. The leaf area index (LAI) was measured. It is an important property of vegetation, since it determines the photosynthetic primary production, the plant evaporation and characterises the plant growth. The average leaf angle (ALA) was also measured. For the computation, leaf pixels were differentiated from soil pixels by using linear discriminant analysis. The stereo vision system computed the distance to the camera of each pixel in the image in the region where the pixels are present in both images. The observed area was computed on the basis of the average distance of the leaf pixels in the region. The leaf area was evaluated for each triplet of adjacent pixels by computing the cross product of the vectors defined by those three points. The sum gave the leaf area for the same region. The area of these triangles was summed for all the pixels in the region and the ratio to the observed area gave the LAI. The ALA was the mean orientation of the pixel triplets. After calibration, the method was found to present a coefficient of correlation of 0.93 with destructive reference measurements and a precision of 0.12 for the LAI. It was possible to measure the LAI and the ALA from the germination up to the ripening stage with a minimum of work load.
Disciplines :
Agriculture & agronomy
Engineering, computing & technology: Multidisciplinary, general & others
Author, co-author :
Leemans, Vincent ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Dumont, Benjamin  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Destain, Marie-France ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Language :
English
Title :
Leaf area and leaf orientation measurement by using stereo-vision
Alternative titles :
[en] Mesure de la superficie et de l'orientation foliaire par vision stéréoscopique
Publication date :
03 September 2013
Number of pages :
1
Event name :
International Workshop on Image Analysis Methods for the Plant Sciences
Event organizer :
University of Nottingham
Event place :
Nottingham, United Kingdom
Event date :
du 2 au 3 Septembre 2013
Audience :
International
Available on ORBi :
since 10 February 2015

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