| Title |
Digital Watermarking using Wavelet Packet Transform |
| Authors |
추형석(Chu, Hyung-Suk) ; 안종구(An, Chong-Koo) |
| Keywords |
WPT ; Digital watermark ; Quad-tree algorithm |
| Abstract |
In this paper, a digital watermarking method using the WPT (Wavelet Packet Transform) is proposed. The proposed algorithm transforms the input image by using the WPT and inserts the watermark by using the quad-tree algorithm and Cox's algorithm. The experiments for evaluating the performances of the proposed algorithm is carried out by inserting a watermark in each wavelet packet transform step and by inserting a watermark into the lowest frequency domain (LL). As a simulation result, the performance of the insertion of the watermark into the 6 levels of WPT is better than that of other cases. In addition, about 30~60% of all watermarks are inserted into the LL band, the correlation value is improved though the PSNR performance decreases 1~2dB. |