In order to differentiate incidental attacks and malicious attacks, semi-fragile watermark must be robust against content-protection image processing. 为了能够区分偶然攻击与恶意篡改,半脆弱水印需要对一般的内容保护图像操作有一定的鲁棒性。
Eliminate the incidental noises before detecting the edge of image. 在进行边界检测之前,首先要滤除原图像的寄生噪声的干扰。