Table 5.

Performance comparison of different preprocessing algorithms. The best results are marked in bold

Preprocessing method	Precision	Specificity	Recall	Accuracy	F1-score
No Preproprocessing	0.8878	0.8840	0.9180	0.9010	0.9027
Average filter	0.9305	0.9420	0.6430	0.7975	0.7605
Gaussian lowpass filter	0.9315	0.9490	0.7740	0.8715	0.8576
Median filter	0.9076	0.9150	0.8350	0.8750	0.8698
Bilateral filter	0.9466	0.9500	0.8860	0.9180	0.9153