To solve the overflow or underflow of the components of appearance attributes caused by watermarking , we clip the error ones to the correct ranges by adjusting the corresponding basis function elements . the normalization operation would destroy the watermark embedded in the normal vector . the author presents a novel approach by rotating the normal vector around a fixed axis , which will modify its orientation , not magnitude 其中,針對(duì)在外觀屬性分量上植入水印的值溢出問題,作者提出了動(dòng)態(tài)修改基函數(shù)的方法;考慮到直接修改法向量分量的方法會(huì)受到法向量單位化操作影響導(dǎo)致水印提取困難,作者提出一種繞固定軸旋轉(zhuǎn)法向量的方法,有效地避免了單位化對(duì)已植入水印信息的影響。