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S. Parimi, A. SaiKrishna, N. R. Kumar, N. R. Raajan.  2015.  "An imperceptible watermarking technique for copyright content using discrete cosine transformation". 2015 International Conference on Circuits, Power and Computing Technologies [ICCPCT-2015]. :1-5.

This paper is nominated for an image protection scheme in the area of government sectors based on discrete cosine transformation with digital watermarking scheme. A cover image has broken down into 8 × 8 non overlapped blocks and transformed from spatial domain into frequency domain. Apply DCT version II of the DCT family to each sub block of the original image. Then embed the watermarking image into the sub blocks. Apply IDCT of version II to send the image through communication channel with watermarked image. To recover the watermarked image, apply DCT and watermarking formula to the sub blocks. The experimental results show that the proposed watermarking procedure gives high security and watermarked image retrieved successfully.