短語(yǔ)詞組短語(yǔ)fragile digital watermarking 脆弱性數(shù)字水印fragile digital image watermarking 脆弱數(shù)字圖像水印Semi -Fragile Printed Digital Watermarking 半脆弱印刷數(shù)字水印 返回 digital fragile watermarking