Robust Signature-Based Copyright Protection Scheme Using the Most Significant Gray-Scale Bits of the Image

Table 2

Experimental results (PSNR in dB and LRR in %) by different approaches of the proposed MSB-based scheme and existing TROI-based [12] and VQ-based [13] schemes against various attacks using Lena image and Monash logo.

Attacks	PSNR	Proposed MSB-based scheme								Existing schemes
		UROI		TBLK		DCTMSB		𝑡-DWT^1		TROI [12]		VQ [13]
		PSNR	LRR	PSNR	LRR	PSNR	LRR	PSNR	LRR	PSNR	LRR	PSNR	LRR
Affine (XY)^5	20.66	19.30	96	14.44	88	14.09	94	10.52	88	14.73	54	14.79	58
Avg. filter^2	36.85	20.58	99	21.41	96	22.04	99	30.20	100	14.97	53	23.08	60
BPM (25 dB)	22.94	14.36	91	12.97	85	11.19	89	15.18	96	13.85	56	23.67	73
Cropping	10.67	∞	100	13.16	94	13.75	87	6.69	71	15.19	53	15.57	83
Gauss. (G) filter^2	36.89	20.58	99	21.43	96	22.04	99	30.20	100	14.97	53	23.12	60
G filter^2 & noise	26.56	16.37	94	16.24	91	16.23	96	24.67	100	14.69	55	23.07	61
G noise	23.03	14.59	90	14.54	89	14.49	95	22.09	99	14.52	57	23.45	66
Histogram equal.	19.36	13.08	86	14.16	89	12.00	86	18.79	98	16.94	62	17.10	55
JPEG (quality 0)	24.88	14.96	93	13.73	84	10.51	87	18.42	98	14.30	37	23.64	79
JPEG (quality 5)	28.23	16.89	95	15.06	90	12.81	93	16.75	97	14.86	48	20.65	53
LSRD^3	20.16	12.66	88	11.92	72	10.87	86	14.19	95	13.81	55	21.76	70
Median filter^2	37.20	20.57	99	20.95	96	21.47	99	21.01	99	15.27	53	23.27	61
Motion filter^2	22.27	12.85	90	12.54	78	13.73	89	14.01	94	11.58	53	17.62	63
Print-copy-scan	11.63	10.98	72	10.64	71	10.00	72	10.07	78	13.20	61	20.72	71
Print-scan	12.52	11.36	74	10.83	72	10.08	73	10.37	87	14.10	63	22.17	69
MSB (30 dB)	30.00	10.82	75	10.28	77	8.15	76	13.91	94	15.13	53	23.14	62
MSB (35 dB)	35.00	13.36	86	12.57	85	11.65	87	18.68	98	15.16	53	23.35	62
MSB (40 dB)	40.00	15.75	92	15.28	91	15.87	94	24.16	100	15.18	53	23.39	64
Rot.-crop (2°)	19.48	16.12	89	10.26	73	11.84	86	11.61	91	13.37	53	19.74	64
Rot.-scale (2°)	19.33	16.22	89	10.21	73	11.70	85	11.36	90	13.34	53	19.65	64
Rot.-scale (5°)	11.66	11.41	82	10.38	70	10.27	70	5.68	62	11.03	52	6.86	60
RCR^4 (1 in 10)^5	34.06	23.82	99	23.42	97	22.39	99	25.40	100	15.11	53	23.43	61
Salt and pepper	18.55	20.56	97	20.43	98	30.60	100	17.38	98	12.99	53	23.04	65
Scaling (×0.5)^5	33.98	19.07	98	19.63	94	21.13	98	30.81	100	15.02	53	23.41	62
Scaling (×2)^5	39.34	24.73	99	23.70	98	24.13	99	23.64	100	15.16	53	23.49	66
Self similarities	26.04	16.47	95	15.21	90	11.37	90	25.61	100	16.71	57	23.47	66
Small rand. dist.	16.27	10.98	83	11.45	72	12.92	84	6.75	71	11.55	53	16.31	69
unZign	29.08	18.18	97	18.48	94	21.69	98	∞	100	14.68	54	23.38	65
Wiener filter^2	41.32	23.81	99	22.11	98	23.27	99	30.66	100	15.25	53	24.00	66

¹Decomposition level 𝑡=4.
²3×3 window.
³Latest small rand. dist.
⁴Row-col-removal.
⁵Resized to original.