Research Article
[Retracted] Dictionary Learning-Based Ultrasound Image Combined with Gastroscope for Diagnosis of Helicobacter pylori-Caused Gastrointestinal Bleeding
Figure 4
Noise reduction effects of the three algorithms ((a) noise ρ =10; (b) noise ; (c) noise ; (d) noise ). Note: represents a statistically significant difference compared with N-KSVD ().
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