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Robust Methods for Measurement of Leaf-Cover Area and Biomass from Image Data

Published online by Cambridge University Press:  20 January 2017

Ran Nisim Lati ,
Sagi Filin  and
Hanan Eizenberg
Ran Nisim Lati*
Affiliation:
Mapping and Geo-Information Engineering, Technion-Israel Institute of Technology, Haifa, Israel
Sagi Filin
Affiliation:
Mapping and Geo-Information Engineering, Technion-Israel Institute of Technology, Haifa, Israel
Hanan Eizenberg
Affiliation:
Department of Weed Research and Plant Pathology, Agricultural Research Organization, Newe Ya'ar Research Center, Israel
*
Corresponding author's E-mail: [email protected]
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Abstract

Leaf-cover area is a widely required plant development parameter for predictive models of weed growth and competition. Its assessment is performed either manually, which is labor intensive, or via visual inspection, which provides biased results. In contrast, digital image processing enables a high level of automation, thereby offering an attractive means for estimating vegetative leaf-cover area. Nonetheless, image-driven analysis is greatly affected by illumination conditions and camera position at the time of imaging and therefore may introduce bias into the analysis. Addressing both of these factors, this paper proposes an image-based model for leaf-cover area and biomass measurements. The proposed model transforms color images into an illumination-invariant representation, thus facilitating accurate leaf-cover detection under varying light conditions. To eliminate the need for fixed camera position, images are transformed into an object–space reference frame, enabling measurement in absolute metric units. Application of the proposed model shows stability in leaf-cover detection and measurement irrespective of camera position and external illumination conditions. When tested on purple nutsedge, one of the world's most troublesome weeds, a linear relation between measured leaf-cover area and plant biomass was obtained regardless of plant developmental stage. Data on the expansion of purple nutsedge leaf-cover area is essential for modeling its spatial growth. The proposed model offers the possibility of acquiring reliable and accurate biological data from digital images without extensive photogrammetric or image-processing expertise.

Keywords

Purple nutsedge, Cyperus rotundus L. CYPROBiomasshomographic transformationimage processinginvariant imageleaf-cover areapurple nutsedge
Type
Special Topics
Information
Weed Science , Volume 59 , Issue 2 , June 2011 , pp. 276 - 284
Copyright
Copyright © Weed Science Society of America 

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