A Polar Complex Exponential Transform-Based Zero-Watermarking for Multiple Medical Images with High Discrimination

<div>Relationship between watermark size and robustness. (a) JPEG compression (QF = 30). (b) Rotation (−5°). (c) Scaling (0.5). (d) Salt and peppers noise (<i>d</i> = 0.01).</div>

Security and Communication Networks

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Figure 6

Figure 6: A Polar Complex Exponential Transform-Based Zero-Watermarking for Multiple Medical Images with High Discrimination 