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

Table 6

Comparison of the MOS using two natural images (Figures 5(c) and 5(d)), 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]	2.42	3.71	1.76	3.18	3.07	3.85	1.97	2.85	2.24	3.61	2.09	3.24	1.70	3.03
[14]	3.07	3.68	1.90	3.15	3.66	3.52	2.76	2.94	2.86	3.48	2.52	3.27	2.29	3.12
Proposed	4.17	4.08	3.03	3.46	4.30	3.98	3.61	3.26	3.65	3.77	3.40	3.47	3.35	3.41