RONI Based Secured and Authenticated Indexing of Lung CT Images

Table 3

PSNR values for the existing and proposed methods.

Method used (without attack)	PSNR (dB)
Discrete cosine transform (DCT) based watermark embedding [26]	32.34
Local binary pattern (LBP) based watermark embedding [27]	39.79
Integer wavelet transform (IWT) based watermark embedding [28]	29.67
Watermarking based on redundant wavelet transform and singular value decomposition (RDWT-SVD) based watermark embedding [25]	36.69
Proposed: RONI based secured and authenticated indexing