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On Secure Digital Image Watermarking Techniques

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Figure

Figure 1. Reconstructed image, compression image and quan- tization image by using DCT
Figure 3. Flow chart for watermark embedding algorithm.
Figure 5. Three original images of 256 × 256 pixels (a) The original lena image (b) The original facial image (c) The original moon image
Figure 7. Grey level of original image and watermarked image under without attacks and the corresponding qualities: (a) Lena (29.2752 db), (272.2211 db), (b) Facial (29.9337 db), (284.1641 db), (c) Moon (24.0375 db), (275.1305 db)
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