Table 3. Effect of adding structural loss or source identity loss on FSS vs. FTS.

Model info	SSIM	PSNR	MSE	ASR 1	ASR 2	FSS & FTS
ɛ = 5 w.o.ζ w.o.η	91.73	31.32	43.30	79.22	30.38	38.73 & 56.09
ɛ = 5 ζ = 0.92 w.o.η	94.50	32.38	34.92	75.48	39.33	45.57 & 53.09
ɛ = 5 w.o.ζ η = 0.15	92.72	31.46	42.16	75.48	42.25	47.82 & 53.36
ɛ = 5 ζ = 0.92 η = 0.15	94.62	32.57	33.72	70.57	43.92	51.76 & 50.96