An Improved Blind Watermarking Algorithm for Image Based on Dwt Domain
نویسندگان
چکیده
This paper has brought forward an improved blind watermarking algorithm based on two-dimensional discrete wavelet transform. Watermarking applied binary image which had direct testing result and special meaning as watermark. Before embedded watermark, the watermarking image is pretreated by using Arnold scrambling to improve its security. According to the human eyes visual characteristic, it selected the watermark embedded position and improved its concealment. The specific means handled the original image two-level DWT and blocks DA sub-graph. Then it used scrambling watermarking values 0 and 1 as control signal to deal with coefficients in each block. It has achieved the watermarking information embedding. As the algorithm extracted watermark, it only needed use the relevant key without the original image and it had more practical value. Experimental results have showed that this algorithm had better concealment and improved the robustness and efficiency.
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