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he important dimension considered in organizing the review is the application of the technique applied to digital image watermarking and the comparative analysis of different techniques is also presented. It is observed that the implementation of neural networks for digital watermarking of color images yet to be improved. As regards future directions, a lot of scope still exists to improve the robustness, imperceptibility and security of the watermarking system. From the review it can be observed that only few intelligent techniques are applied to digital image watermarking. There are several other intelligent techniques such as rough sets, decision trees etc. and full potential of soft computing techniques, neural networks, fuzzy log...