CAJ | 학술논문

用于二值图像内容认证和篡改定位的数字水印技术具有重要的实际价值,但却面临着二值图像像素单一、嵌入容量有限且分布不均匀等问题.根据纠错码--RS码的检错原理,提出一种用于二值图像内容认证和篡改定位的脆弱的数字水印算法.该算法利用二值图像的像素值来构造RS码,通过嵌入其校验码来实现对图像的内容认证和篡改定位,一方面保证了其优越的检错能力;另一方面,具有较低的嵌入负载.经实验证明,该算法能有效地检测出二值图像是否被篡改以及篡改发生的位置.此外,在水印信号的生成和提取过程中使用了密钥,确保了水印的安全.
용우이치도상내용인증화찬개정위적수자수인기술구유중요적실제개치,단각면림착이치도상상소단일、감입용량유한차분포불균균등문제.근거규착마--RS마적검착원리,제출일충용우이치도상내용인증화찬개정위적취약적수자수인산법.해산법이용이치도상적상소치래구조RS마,통과감입기교험마래실현대도상적내용인증화찬개정위,일방면보증료기우월적검착능력;령일방면,구유교저적감입부재.경실험증명,해산법능유효지검측출이치도상시부피찬개이급찬개발생적위치.차외,재수인신호적생성화제취과정중사용료밀약,학보료수인적안전.
Image authentication and tamper localization for binary images are very important but difficult because a binary image has only two values and possesses limited and uneven embedding capacity.In this paper,a fragile digital watermarking algorithm is proposed for binary image authentication and tamper localization based on error correcting codes-RS codes.The superiority of error detection capability is achieved by embedding the check codes of RS codes constructed according to the pixel value in binary images,and in the meanwhile low embedding payload is needed.Experiment results demonstrate that the proposed method can ensure the efficiency in detecting and locating any tampering.In addition,the secret key is used in the process of watermark signal generation and extraction to guarantee the security.