Wheat Leaf Rust Disease Severity Estimation Using Reflectance Spectrum Coding Methods
نویسندگان
چکیده مقاله:
Using spectroradiometry and remote sensing techniques is an effective and rapid method in diagnosing vegetation diseases which enforced mostly by using spectral vegetation indices and statistical methods. The present study aimed to deploy encoding technique for the reflectance spectrum of the wheat leaves to assess the severity of the Rust disease. This is unlike to the spectral vegetation indices in which the shape of the spectrum, in all bands, independent from time and place is examined. A comprehensive laboratory spectroradiometry were used in the present study in which different stages of the development of the wheat rust stage were considered. The encoding methods were applied to the reflectance spectrum and its derivatives by the Equal Intervals Coding (EIC) and 1bit, 2bit and 3bit information and Threshold Coding (TC) methods for the 500-800 and 400-1050nm wavelength ranges. In this respect, the healthy green leaf code used as a reference. Then the similarity between any other leaf codes and the green leaf code were used to find the degree of the severity of the disease. Beside the reflectance spectrum, the progress of the disease on the leaf under observation were determined using a digital camera. The best result found to be for 3bit- TC in the 500-800 nm wavelength region with R2 and RMSE of the order of 0.95 and 0.05, respectively. Finally, the portion of the rust affected leaf was determined in four levels based on the green spot absence in which, the overall accuracy and Kappa coefficient were 85.96% and 0.81%, respectively.
منابع مشابه
Wheat leaf rust caused by Puccinia triticina.
UNLABELLED Leaf rust, caused by Puccinia triticina, is the most common rust disease of wheat. The fungus is an obligate parasite capable of producing infectious urediniospores as long as infected leaf tissue remains alive. Urediniospores can be wind-disseminated and infect host plants hundreds of kilometres from their source plant, which can result in wheat leaf rust epidemics on a continental ...
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عنوان ژورنال
دوره 6 شماره 4
صفحات 17- 30
تاریخ انتشار 2019-03
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