Visual Monitoring Technology for Substation Vulnerable High-Voltage Electrical Equipment Based on ISSA-LSTM Deep Learning Model Coupling Video Overlay Algorithm

Table 2

Objective index comparison of image quality before and after fusion.

Objective indicators	Prefusion results	Postfusion result
Entropy	7.55	7.57
Standard deviation	55.39	56.48
Root mean square error	6.63	2.84
Peak signal-to-noise ratio	70.36	87.33
Spatial frequency	11.026	15.51
Average gradient	5.192	6.09