The watermark decision threshold is lack of adaptability to the illumination and the print quality. So we propose a method to normalize the watermark decision threshold, which greatly improves the success rate of watermark judgment.

• 由于水印判决阈值缺乏对光照、打印质量等全局因素的自适应性,本文提出了水印判决阈值归一化处理的方法,大大提高了水印判决的成功率。