Visible Watermarking Technique Based on Human Visual System for Single Sensor Digital Cameras

Table 5

Comparison of the MOS using two artificial images (Figures 5(a) and 5(b)), among two previously proposed algorithms [13, 14] and proposed algorithm under several attacks. “V” and “UO” mean watermark visibility and unobtrusiveness, respectively.

Algorithms	JPEG compression; (quality factor: 30%)		High contrast; (+200)		Low contrast; (−200)		Gaussian blur; (8 × 8 filter)		High luminance; (+100)		Low luminance; (−100)		Gaussian noise; (variance 0.01)
	V	UO	V	UO	V	UO	V	UO	V	UO	V	UO	V	UO
[13]	3.13	3.92	2.66	3.68	3.13	3.45	2.86	3.23	2.86	3.47	2.35	3.17	2.39	3.20
[14]	3.04	3.77	2.45	3.50	3.57	3.48	2.97	3.25	2.94	3.47	2.37	3.11	2.40	3.15
Proposed	4.56	4.32	4.49	4.19	4.36	3.83	4.24	3.69	4.17	3.87	3.98	3.71	4.00	3.75