Table 4.

Image entropy and image contrast of imaging results in Figure 6 and Figure 8.

Algorithms	Indicators	Original Data	−5 dB	−10 dB
FP-MEA	Image entropy	11.7602	11.7887	11.8033
	Image contrast	17.2855	16.9824	15.5231
N-MEA	Image entropy	11.6461	11.6823	11.7056
	Image contrast	22.8327	21.8398	19.6554
DN-MEA	Image entropy	11.5264	11.5319	11.5384
	Image contrast	29.5762	28.0903	26.0834