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Table 1 Classification accuracy [%] of spectral angle mapper classification of Cercospora leaf spot and powdery mildew diseased leaves during disease progress and quantification of diseased leaf area by SAM classification.

From: Hyperspectral imaging for small-scale analysis of symptoms caused by different sugar beet diseases

Disease

 

Days after inoculation

  

8

11

14

17

20

Cercospora leaf spot

Overall accuracy [%]

98.90

89.01

96.58

98.73

 
 

Kappa coefficient

0.99

0.53

0.92

0.98

 
 

Diseased leaf area [%]

0

6.56

7.61

20.92

 

Powdery mildew

Overall accuracy [%]

94.34

96.79

97.23

90.18

 
 

Kappa coefficient

0.88

0.91

0.95

0.84

 
 

Diseased leaf area [%]

14.40

19.37

41.94

50.04

 

Sugar beet rust

Overall accuracy [%]

    

61.70

 

Kappa coefficient

    

0.56

 

Diseased leaf area [%]

    

2.89

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Plant Methods

ISSN: 1746-4811