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

Earth, Planets and Space

Table 5 SVM model classification accuracy with image filters and clustering size of 2

Applied clusters	Model accuracy of each cluster with image filtering (%)
Applied clusters	Image sharpening	Image thresholding	Median blur	Gamma correction	Fast-NLmeans	Bilateral
1st cluster	86.5	85.9	85.8	85.9	86.4	85.9
2nd cluster	85.7	85.4	85.8	85.4	86.1	86.4
All clusters	86.1	86.4	83.9	85.8	85.8	85.8