Research Article
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 | |
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