CAJ | 학술논문

以图像篡改定位为目的，提出了一种基于正交化分形编码和混沌相结合的脆弱数字水印技术。该算法利用宿主图像的分形编码参数信息作为混沌映射的初值，从而通过混沌映射产生混沌二值水印，所产生的混沌二值水印再嵌入到宿主图像中，从而实现图像的篡改定位。算法能有效的检测图像是否被恶意篡改，并且不同宿主图像能够产生不同的混沌二值水印，加强了算法的保密性，在处理大批量图像的时候优势更明显。实验数据表明，算法可行有效，拥有良好的图像篡改定位能力。
이도상찬개정위위목적，제출료일충기우정교화분형편마화혼돈상결합적취약수자수인기술。해산법이용숙주도상적분형편마삼수신식작위혼돈영사적초치，종이통과혼돈영사산생혼돈이치수인，소산생적혼돈이치수인재감입도숙주도상중，종이실현도상적찬개정위。산법능유효적검측도상시부피악의찬개，병차불동숙주도상능구산생불동적혼돈이치수인，가강료산법적보밀성，재처리대비량도상적시후우세경명현。실험수거표명，산법가행유효，옹유량호적도상찬개정위능력。
For the purpose of image tampering localization ,a fragile digital watermarking method is proposed on the basis of orthogonal fractal coding and chaos .The algorithm use the fractal coding parameters as a key to create the chaotic binary watermark to be embedded into the fractal coding field ,so as to realize the image authentication .The algorithm can effectively detect whether the image is malicious tampered ,and different host image will produce different chaotic binary watermark ,which strengthen the confidentiality of the algorithm ,especially in the face of mass image processing .The simulation results show that the proposed algorithm is efficacious and practical ,and has precise tamper localization to grayscale images .