Transform Domain-based Digital Image Watermarking Algorithm

With the rapid development of information technology and networktechnology, the storage, replication and transmission of digital multimedia hasbecome very convenient. To prevent from occurring of piracy and infringementand to the wide dissemination of multimedia information,digital watermarkingtechnology came into being. In recent years, the digital watermarkingtechnology is the forefront of research, which involves signal and imageprocessing, computer science, chaos, cryptography, data communications andother fields and is an interdisciplinary. In essence, the digital watermark isembedded directly into the digital carrier image and does not affect the value ofthe original carriers and ensure carriers undetectable. It can conforms whetherthe carrier be tempered by the hidden of watermark. Therefore, digitalwatermarking technology has played important role in copyright protection ofmultimedia information and the integrity of the certification. It has become a hotresearch field.The main purpose of this paper is to study the digital watermarkingalgorithm based on DWT-SVD,Liu Ruizhen proposed SVD based digitalwatermarking algorithm has high error detection rate of defect We finds andigital watermarking algorithm base on block color images in the RGB domainembedded in the binary image watermarking algorithm, the algorithm firstArnold scrambling the original watermark, and then remove the original RGBcomponents of color images, and then remove each component corresponds tothe line to form a block matrix, the watermark image can also do the same withwatermark embedded into the singular values of each one, until all blocks areembedded.The experimental results show that the algorithm can effectivelyreduce the false alarm probability of watermark detection system, improve thesecurity of the watermarking system, the other to attack the algorithm has betterrobustness. Finally,we study an digital watermarking algorithm based onDWT-SVD,Robust Grayscale Watermarking algorithm.The method uses boththe stability of discrete wavelet transform against common distortion and thestability of singular value decomposition against geometric distortion．Thealgorithm is to embedded in a grayscale watermark image to the singular valuesafter the low-frequency coefficients in discrete wavelet transform,experimentresults show that this new watermark algorithm is feasible and can maintainimage quality, that are resistant to common image processing and attack (such asadding noise, cut, etc.), the watermark is robust.