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

Table 10

Comparisons of different approaches of the proposed scheme and existing schemes [12, 13].

Issues	Existing		Approaches of the proposed MSB-based scheme
	TROI [12]	VQ [13]	UROI	TBLK	DCTMSB	t-DWT
Transparency	yes	yes	yes	yes	yes	yes
Robustness	no	no	high	moderate	high	no
Uniqueness	no	yes	yes	yes	yes	yes
Unambiguous	no	no	yes	yes	yes	no
Security	yes	yes	yes	yes	yes	yes
Blindness	semi-blind	blind	semi-blind	semi-blind	semi-blind	semi-blind
Multiple logo	yes	yes	yes	yes	yes	yes
Publicly verifiable	no	yes	no	no	no	no
StirMark resistance	no	no	moderate	low	moderate	no
MSB attack resistance	moderate	high	moderate	moderate	moderate	high
Scalability^1	no	no	yes	yes	yes	yes
Signature addition^2	no	yes	no	no	no	no
JPEG quality < 10	low	high	high	high	high	high
Operation domain	spatial	DWT	spatial	spatial	DCT	DWT
Time complexity	high	high	constant	low	low	low
Algorithm simplicity	no	no	yes	yes	yes	yes
Region-of-interest used	yes	no	yes	no	no	no

¹Signature calculation using different types of image and logo.
²With image header.