CAJ | 학술논문

为使水印具有不可见性，提出了一种基于图像边缘和误差扩散的数字半色调图像水印算法。Canny算子去噪能力强，在边缘检测和噪声间能取得较好的平衡。先对灰度图像进行Canny边缘检测，得到灰度图像的边缘，然后将灰度图像的边缘近似作为半色调图像的边缘，并在灰度图像使用误差扩散算法进行半色调的同时，在边缘位置进行二值水印的嵌入。对水印图像进行了Arnold预处理，增强了水印的抗剪裁和涂抹攻击的能力。结果表明，该算法不会造成图像的明显失真，能很好地抵抗剪切、涂抹、JPEG压缩、噪声攻击。
위사수인구유불가견성，제출료일충기우도상변연화오차확산적수자반색조도상수인산법。Canny산자거조능력강，재변연검측화조성간능취득교호적평형。선대회도도상진행Canny변연검측，득도회도도상적변연，연후장회도도상적변연근사작위반색조도상적변연，병재회도도상사용오차확산산법진행반색조적동시，재변연위치진행이치수인적감입。대수인도상진행료Arnold예처리，증강료수인적항전재화도말공격적능력。결과표명，해산법불회조성도상적명현실진，능흔호지저항전절、도말、JPEG압축、조성공격。
In order to achieve the goal of good imperceptibility, a kind of digital halftone image watermarking algorithm is proposed, which is based on the edge detection and error diffusion. The Canny operator has a good ability of denoising, at the same time, it can achieve a better balance between edge detection and noise. The edge of gray image is gotten using Canny detection and can be approximated as the edge of the halftone image. While the gray image turns to halftone image using error diffusion algorithm, binary watermark is embedded in the edge position. In order to enhance the ability to resist cropping attack and smearing attack, the watermark image is pretreated with Arnold. Experiment results show that this algorithm does not cause significant distortion of the image and is good resistance to cropping, smearing, JPEG compression and noise attacks.