To check that the drip lines are not taut or twisted during the embedding procedure 檢查在鋪設(shè)時滴灌管沒有拉得太緊或扭曲。
Extracting the watermark requires the original image , and its procedure is the reverse of embedding procedure . the existence of watermark is decided by observation visually and similarity measurement 水印恢復(fù)時需借助原始圖像信息,其過程是水印嵌入的逆過程,水印的存在性通過視覺觀察和相似性度量兩種標(biāo)準(zhǔn)來判定。