Fig. 1. Target characteristics for different backgrounds

Fig. 2. The overall algorithm flow

Fig. 3. Background suppression results

Fig. 4. Heat maps corresponding to grayscale values for different areas in the image（zone 2 is the target region）

Fig. 5. Schematic of background suppression results（zone 0 represents the target area and zones 1~8 represents its 8 neighborhoods）

Fig. 6. Background suppression results of different regions and their 3-dimensional characteristics

Fig. 7. The influence of different parameters $m$ on the value $k$ mapping curve

Fig. 8. Ablation experiment results

Fig. 9. Example of different test video figure

Fig. 10. Five typical scenario test figure

Fig. 11. Comparison of visual results of each method in five typical scenarios

Fig. 12. The hardware implementation effect of the proposed method in different complexity scenarios