Blind data hiding technique using the Fresnelet transform

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Table 3 PSNR (dB) of the information embedded image

Information embedded images (512 × 512)	USAF (256 × 256) Scaling factor (α)					DDNT (256 × 256) Scaling factor (α)
Information embedded images (512 × 512)	0.03	0.04	0.05	0.06	0.07	0.03	0.04	0.05	0.06	0.07
Camerman	38.99	37.57	36.24	35.03	33.94	39.60	38.35	37.15	36.03	35.00
Pepper	40.92	38.85	37.14	35.68	34.42	41.89	39.94	38.29	36.88	35.64
Elaine	32.67	32.29	31.85	31.36	30.85	32.80	32.51	32.16	31.77	31.35
Lena	33.97	33.46	32.90	31.66	32.29	34.14	33.75	33.30	32.80	32.27