如何達(dá)到健壯性和透明性之間的平衡是數(shù)字水印技術(shù)最大難題。二者此消則彼長。
本文將零水印概念具體貫徹到工程圖產(chǎn)權(quán)保護(hù)領(lǐng)域。算法基于ObjectARX 技術(shù)，取出原始工程圖的特征參數(shù)得到數(shù)字條形碼序列，檢測(cè)時(shí)以之與被測(cè)圖數(shù)據(jù)比較，計(jì)算相關(guān)系數(shù)，判斷水印有無。實(shí)驗(yàn)結(jié)果表明，該算法在保證完美透明性的前提下，具備相當(dāng)?shù)慕研浴?BR>關(guān)鍵詞 計(jì)算機(jī)應(yīng)用數(shù)字水印 相關(guān)系數(shù) 健壯性
Abstract: The tradeoff between robustness and invisibility remains the bottleneck
in digital watermarking technology. To solve this problem, a new concept, null-watermark technique, is introduced and instanced in this paper. The eigenvector is extracted from the original drawing and kept in some certain database in accordance with digital watermarking security system. While detecting the eigenvector is compared with data of tested drawing to evaluate the correlation coefficient, on which a judgment of watermark existence will be made. Experiments verify the robustness of this approach.
Key words: computer application ; digital watermark; correlation coefficient; robustness