A High-Capacity Image Steganography Method Using Chaotic Particle Swarm Optimization

Table 4

PSNR for Lena, Peppers, and Boat using Airplane and Baboon as secret images.

Secret image	Cover image		Lena	Peppers	Boat
	Resolution	Capacity (bits)	PSNR (dB)	PSNR (dB)	PSNR (dB)
Airplane	64 × 64	32,768	68.51	64.99	68.84
	80 × 80	51,200	67.184	63.16	67.22
	90 × 90	64,800	65.823	63.2	66.13
	96 × 96	73,728	62.58	62.66	65.63
	116 × 116	107,648	60.03	59.30	63.90
	128 × 128	131,072	59.42	58.80	63.00
	160 × 160	204,800	56.15	56.58	61.02
Baboon	64 × 64	32,768	69.02	68.94	69.20
	80 × 80	51,200	67.37	67.12	67.38
	90 × 90	64,800	66.27	66.30	66.24
	96 × 96	73,728	65.66	65.82	65.69
	116 × 116	107,648	64.03	61.02	64.08
	128 × 128	131,072	60.15	60.2	63.08
	160 × 160	204,800	60.10	58.38	61.20