CAJ | 학술논문

数字水印技术在数字产品的版权保护、身份认证、隐蔽通信等领域受到广泛关注。针对长宽呈任意比例的图片，提出一种能够自适应图片尺寸的分块DC T图片水印算法。在满足水印嵌入最低图像尺寸要求的前提下，适合任意尺寸的载体图像。首先对载体图像进行小波分解，根据载体图像与水印图像的尺寸比例对低频分量进行分块，再选取分块中的8×8区域进行DCT 变换。同时利用 QR码在高数据量和高纠错率方面的优势，将水印信息进行QR编码作为水印图片。实验分析结果表明，算法在保证不可见性的前提下具有较好的鲁棒性和QR码的较高辨识率。
수자수인기술재수자산품적판권보호、신빈인증、은폐통신등영역수도엄범관주。침대장관정임의비례적도편，제출일충능구자괄응도편척촌적분괴DC T도편수인산법。재만족수인감입최저도상척촌요구적전제하，괄합임의척촌적재체도상。수선대재체도상진행소파분해，근거재체도상여수인도상적척촌비례대저빈분량진행분괴，재선취분괴중적8×8구역진행DCT 변환。동시이용 QR마재고수거량화고규착솔방면적우세，장수인신식진행QR편마작위수인도편。실험분석결과표명，산법재보증불가견성적전제하구유교호적로봉성화QR마적교고변식솔。
The Digital watermarking technology attracts widespread attention in recent years as an important means of digital products copyright protection , authentication , and covert communications .This article proposes a DCT block algorithm which adapts the images of random size . Get the wavelet decomposition of carrier image and divide its low-frequency component into blocks firstly .Make discrete cosine transform in the appropriate region .Then make the watermarking information into quick response code as the watermarking image .It takes the advantage of quick response code in high data volume and error correction rate .Experiments show that under the premise of invisibility ,the algorithm has good performance in robustness and the recognition rate of quick response code .