DCT Watermarking Approach for Security Enhancement of Multimodal System

Table 3

Watermark Extraction Bit Error Rate due to JPEG Compression.

Image	Imperceptibility measurement PSNR			Quality; Factor; (Q)	Comp-ression; (BPP)	Watermark extraction BER (%)
	Proposed method	Method in [26]	Method in [27]			Propose method	Method in [26]	Method in [27]
Texture	37.2025	36.7493	35.7245	90	2.8527	0	0.39	0.93
				80	2.1015	0	0.39	0.93
				75	1.8981	0	0.39	0.93
Cameraman	38.2340	38.3245	34.8972	90	2.1323	0	0.56	2.47
				80	1.4608	0	0.56	2.47
				75	1.2816	0.1	0.56	2.47
India logo	48.7235	46.2068	36.8863	90	2.5463	0	0.39	0.93
				80	1.8955	0	0.39	0.93
				75	1.7143	0	0.39	0.93
Bank logo	42.0910	41.8456	39.6230	90	1.9196	0	0.73	1.35
				80	1.4365	0	0.73	1.35
				75	1.3010	0.5	0.73	1.35