本文提出一種基于閥值曲面的數字水印方法，先構造原始圖像的閥值曲面，得到原始
圖像的輪廓信息，然后在輪廓邊緣處嵌入水印。由于該方法采用的構造閥值曲面函數高平滑性與易插值等特點，故該方法對濾波，縮放等攻擊具有強抵抗力。實驗結果也證明該方法具有這些優點。
關鍵詞： 閾值曲面；數字水印；核函數
Abstract: This paper proposes a numeric watermark method based on valve value of curve surface. First it builds the valve value of curve surface of the original image to get the outline information of the original image; then it embeds watermarks into the edge of the outline. Because the function used by the method to build valve value of curve surface has high gliding property and easy interpolation ability, the method has strong resistance to attacks like filtering and zooming. The experimental results show that the method has the above advantages.
Keywords： valve value of curve surface; numeric curve ; kernel function