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Sci., 2009, 179, (6), pp. 791–808" }, { "key": "ref4", "doi": "10.1049/iet-ipr.2008.0068", "unstructured": "Liu, K.C., Chou and C.H.: „Robust and transparent watermarking scheme for color images‟, IET Image Process., 2009, 3, (4), pp. 228–242" }, { "key": "ref5", "unstructured": "De Vugt, F.: „Quantization-watermarking methods for digital audio‟, 2001" }, { "key": "ref6", "doi": "10.1109/icip.1997.647968", "unstructured": "Ruanaidh, J., Pun, T.: „Rotation, scale and translation invariant digital image watermarking‟. Proc. IEEE Int. Conf. Image Processing, 1997, pp. 536–539" }, { "key": "ref7", "doi": "10.1016/j.aeue.2012.06.008", "unstructured": "Makbol, N.M., Khoo, B.E.: „Robust blind image watermarking scheme based on redundant discrete wavelet transform and singular value decomposition‟, AEU-Int. J. Electron. C, 2013, 67, (2), pp. 102–112" }, { "key": "ref8", "doi": "10.1016/j.ins.2007.02.019", "unstructured": "Chang, C., Lin, C., Tseng, C., et al.: „Reversible hiding in DCT-based compressed images‟, Inf. Sci., 2007, 177, (13), pp. 2768–2786" }, { "key": "ref9", "doi": "10.1109/83.650120", "unstructured": "Cox, I., Kilian, J., Leighton, F., et al.: „Secure spread spectrum watermarking for multimedia‟, IEEE Trans. Image Process., 1997, 6, (12), pp. 1673–1687" }, { "key": "ref10", "doi": "10.1109/tifs.2007.897266", "unstructured": "Li, Q., Cox, I.: „Using perceptual models to improve fidelity and provide resistance to volumetric scaling for quantization index modulation watermarking‟, IEEE Trans. Inf. Forensics Sec., 2007, 2, (2), pp. 127–139" }, { "key": "ref11", "doi": "10.1016/j.optcom.2009.04.034", "unstructured": "Aslantas, V., Ozer, S., Ozturk, S.: „Improving the performance of DCT-based fragile watermarking using intelligent optimization algorithms‟, Opt. 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