A Semi-Fragile, Inner-Outer Block-Based Watermarking Method Using Scrambling and Frequency Domain Algorithms

Image watermarking is most often used to prove that an image belongs someone and make sure the same as was originally produced. The type of for detection originality tampering known authentication-type watermarking. In this paper, a blind semi-fragile authentication method introduced. Although main concern in paper authenticating image, proving ownership additionally implemented. considers two parts: inner part outer part. parts are divided into non-overlapping blocks. block size different. blocks have greater area than so their watermark-holding capacity greater, providing enough robustness semi-fragility. watermarked authenticated despite JPEG being compressed 75% quality. embedded watermark also survives innocent types operations, such intensity adjustment, histogram equalization gamma correction. Semi-fragile selectively fragile valuable high demand specifically because it these operations while detecting ill-intentioned tampering. work, we embed binary images using scrambling algorithm, discrete wavelet transform (DWT) cosine (DCT) proposed methodology has quality after watermarking, with PSNR value 40.577, achieved compression. embedding process provides acceptable tamper attacks, including compression, Gaussian noise, average filtering, scaling attacks values 29. Experimental results obtained show algorithm more robust, secure resistant other algorithms literature.