短語詞組短語Fragile Digital Watermark 易碎的數(shù)字水印;脆弱數(shù)字水印Fragile invisible watermark 脆弱不可見水印semi -fragile watermark 半脆弱水印self -fragile watermark 半脆弱水印fragile and weak watermark 脆弱水印 返回 fragile watermark