Considering the problems of copyright from bruiting randomly by the buyers, a spatial domain digital watermarking arithmetic, which can recover destroyed watermark, is introduced in this paper.

• 摘要针对当前数字图像被购买者随意的散播、修改，而造成的版权问题，提出了一种空域水印认证算法，即使水印信息被篡改，也能够修复水印信息。