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Performance Analysis for Digital watermarking using Quad-Tree Algorithm based on Wavelet Packet  

Chu, Hyung-Suk (특허청)
Kim, Han-Kil (울산대학교대학원)
An, Chong-Koo (울산대학교)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.11, no.4, 2010 , pp. 310-319 More about this Journal
Abstract
In this paper, digital watermarking method using wavelet transform and quad-tree algorithm is proposed. The proposed algorithm transforms the input image by DWT(Discrete Wavelet Transform) and AWPT(Adaptive Wavelet Packet Transform), inserts the watermark by quad-tree algorithm and the Cox's algorithm. The simulation for performance analysis of the proposed algorithm is implemented about the effect of embedding watermark in each subband coefficient (HH, LH, HL) of DWT, each DWT level, and each AWPT level. The simulation result by using DWT is compared with that using AWPT in the proposed algorithm. In addition, the effect of embedding watermark in the lowest frequency band (LL) is simulated. As a simulation result using DWT, the watermarking performance of simultaneously embedding in HH, LH, and HL band of DWT(6 level) is better than that of different cases. The result of AWPT(3 level) improves the correlation value compared to that of DWT(3 level). In addition, insertion the watermark to the LL band about 30~60% of all watermarks improves the correlation value while PSNR performance decreases 1~2dB.
Keywords
DWT; Digital watermarking; Quad-tree; AWPT;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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