Fig. 1. Framework of millimeter wave hologram target detection system

Fig. 2. Foreground image with corresponding gray histogram

Fig. 3. AMMW holographic image preprocessing method based on spatial filtering and CH-Guided K-Means clustering

Fig. 4. Foreground image with corresponding gray histogram

Fig. 5. The structure of our proposed feature extractor

Fig. 6. Target

Fig. 7. Detection results

Fig. 8. Precision - recall curve

Fig. 9. Loss curve