| Title |
A Watermarking Scheme of Lowest Frequency Band Based on the Quad-Tree Algorithm |
| Authors |
정병수(Jeong, Byong-Soo) ; 추형석(Chu, Hyung-Suk) ; 신성욱(Shin, Soung-Wook) ; 안종구(An, Chong-Koo) |
| Keywords |
quad-tree algorithm ; dwt ; digital watermarking |
| Abstract |
In this paper, digital watermarking method using quad-tree algorithm and the lowest frequency band is proposed. The proposed algorithm searches the coefficient of the watermark by using quad-tree algorithm and inserts the watermark by the Cox's algorithm. The simulation of the proposed algorithm is implemented about the effect of various weight factors in Cox's algorithm, that of embedding watermark in each subband coefficient (HH, LH, HL), and that of embedding in the lowest frequency band (LL). As a simulation result, the bigger weight factors in Cox's algorithm show strong to noise. The watermarking performance of simultaneously embedding in HH, LH, and HL band is better than that of different cases. In addition, insertion the watermark to the LL band about 30~60% of all watermarks improves the watermarking performance in comparison with the case of not using the LL band. |