Reversible and Fragile Watermarking for Medical Images

Table 2

Comparison summary.

Sr. No.	Comparison parameter	Zain & Clarke [19]	Proposed scheme
1	PSNR achieved	51.5dB	72.98dB
2	Security /authentication measures	Hash	CRC and Chaos
3	Embedding method and data	Plain LSB embedding with self-generated binary string	Residue with chaotically selected pixel embedding
4	Type of attacks	Adobe photoshop cloning	Salt & Pepper noise, AWGN
5	Tamper detection	Yes	Yes
6	Robustness of watermark	No	No
7	Host image	Fragile and recoverable only if there is no attack	Highly fragile and exactly recoverable without attack
8	Image type	Ultrasound	MRI, Ultrasound