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Table 6 SVM model classification accuracy with image filters and clustering size of 3

From: Automatic classification of spread‐F types in ionogram images using support vector machine and convolutional neural network

Applied clusters

Model accuracy of each cluster(s) with image filtering (%)

Image sharpening

Image thresholding

Median blur

Gamma correction

Fast-NLmeans

Bilateral

1st cluster

86.5

86.1

85.4

86.1

86.1

85.8

2nd cluster

86.2

85.8

85.1

86.2

86.5

85.8

3rd cluster

85.5

85.7

85.5

85.8

85.8

85.8

1st and 2nd cluster

87.0

85.8

84.7

85.8

86.5

85.9

1st and 3rd cluster

85.4

85.5

85.9

85.2

85.8

85.4

2nd and 3rd cluster

85.5

86.2

84.2

86.1

86.2

86.1

All clusters

86.1

86.4

83.9

85.8

85.8

85.8