數(shù)字水印中的正交小波基
The orthogonal wavelet bases for digital watermarking
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摘要: 該文主要研究了水印算法中小波基的選擇和正交小波基的性質(zhì)與水印穩(wěn)健性的關(guān)系。研究結(jié)果表明:正交小波基的正則性、消失矩階數(shù)、支撐長度以及小波圖像能量在低頻帶的集中程度對水印穩(wěn)健性的影響極小。同時也得到了一個有意義的結(jié)論:Haar小波比較適合應(yīng)用于圖像水印。該文還研究了在水印算法中,小波變換級數(shù)和嵌入公式的選取及其它一些問題。
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關(guān)鍵詞:
- 數(shù)字水印; 正交小波基; 小波變換; 穩(wěn)健性
Abstract: In this paper, based on an embedding strategy for watermarking in DWT domain, the influence of characteristics of orthogonal wavelet for the robustness of watermarking and the selection of wavelet bases are mainly investigated. The results show the features like regularity, number of vanishing moments, filter length and the degree of energy collecting in the low frequency subband do not have any important impact on the robustness for watermarking. Meanwhile a significant conclusion that wavelet Haar is the most suitable for digital watermarking is got. Wavelet decomposed levels and watermarking embedding formula are also addressed. -
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