CAJ | 학술논문

　　为了提高图像在空间域嵌入水印后的透明性和稳健性，本文提出了一种基于图像区域极值的数字水印嵌入和提取方法：首先将图像分为几大块，再将每块分成许多小的区域，然后将水印同时嵌入各块每个区域的极值中；在提取水印时按嵌入的逆过程进行。实验结果表明，该算法水印的隐藏效果好、抗裁剪进攻及抗噪声干扰能力较强，并具有较高的运行效率。
　　위료제고도상재공간역감입수인후적투명성화은건성，본문제출료일충기우도상구역겁치적수자수인감입화제취방법：수선장도상분위궤대괴，재장매괴분성허다소적구역，연후장수인동시감입각괴매개구역적겁치중；재제취수인시안감입적역과정진행。실험결과표명，해산법수인적은장효과호、항재전진공급항조성간우능력교강，병구유교고적운행효솔。
For the sake of enhancing the transparence and steadiness of image embedded watermark in spacial domain,a watermark’s embedding and extracting algorithm based on image region extremum is presented.At first, the image is separated into several blocks, then each block is separated into smal er regions, at last, the watermark is embedded in each smal er region of each block simultaneously. The watermark extracting is an inverse process of watermark embedding. The test results verifled that the watermark has good hiding effect, stronger anti-cutting performance and anti-noise interference capacity, as wel as higher running efficiency.