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In view of the frequent multimedia data transfer authentication andprotection of images has gained importance in todays world. In this paper wepropose a new watermarking technique, based on bit plane, which enhancesrobustness and capacity of the watermark, as well as maintains transparency ofthe watermark and fidelity of the image. In the proposed technique, higherstrength bit plane of digital signature watermark is embedded in to asignificant bit plane of the original image. The combination of bit planes(image and watermark) selection is an important issue. Therefore, a mechanismis developed for appropriate bit plane selection. Ten different attacks areselected to test different alternatives. These attacks are given differentweightings as appropriate to user requirement. A weighted correlationcoefficient for retrieved watermark is estimated for each of the alternatives.Based on these estimated values optimal bit plane combination is identified fora given user requirement. The proposed method is found to be useful forauthentication and to prove legal ownership. We observed better results by ourproposed method in comparison with the previously reported work on pseudorandomwatermark embedded in least significant bit (LSB) plane.

Optimization of Bit Plane Combination for Efficient Digital Image Watermarking