Multiple Content Adaptive Intelligent Watermarking Schemes for the Protection of Blocks of a Document Image

Most of the documents contain different types of information such as white space, static information and dynamic information or mix of static and dynamic information. In this paper, multiple watermarking schemes are proposed for protection of the information content. The proposed approach comprises of three phases. In Phase-1, the edges of the source document image are extracted and the edge image is decomposed into blocks of uniform size. In Phase-2, GLCM features like energy, homogeneity, contrast and correlation are extracted from each block and the blocks are classified as no-information, static, dynamic and mix of static and dynamic information content blocks. The adjacent blocks of same type are merged together into a single block. Each block is watermarked in Phase-3. The type and amount of watermarking applied is decided intelligently and adaptively based on the classification of the blocks which results in improving embedding capacity and reducing time complexity incurred during watermarking. Experiments are conducted exhaustively on all the images in the corpus. The experimental evaluations exhibit better classification of segments based on information content in the block. The proposed technique also outperforms the existing watermarking schemes on document images in terms of robustness, accuracy of tamper detection and recovery

ANALISIS DAN IMPLEMENTASI WATERMARKING DENGAN MENGGUNAKAN HOMOGENEITY IN IMAGE ANALYSIS AND IMPLEMENTATION WATERMARKING USING HOMOGENEITY IN IMAGE

ABSTRAKSI: Kemudahan distribusi media digital, khususnya melalui internet ternyata memberikan dampak negatif bagi usaha-usaha perlindungan hak cipta atas media digital. Watermarking digital sebagai salah satu solusi yang bisa digunakan untuk mengatasi masalah ini, dihadapkan pada permasalahan ketahanan terhadap distorsi yang mungkin terjadi selama proses distribusi.Salah satu teknik dalam watermarking adalah dengan Homogeneity Image, yang merupakan salah satu watermarking pada domain spasial dimana pada metode ini ditawarkan sebuah sistem watermarking yang dapat mengedepankan imperceptibilty serta robustness. Proses penyisipan dilakukan dengan menganalisis intensitas pixel sebuah image yang telah dipartisi menjadi blok-blok (block-based watermarking) yaitu blok berukuran 4x4 pixel, dan 8x8 pixel dimana blok dengan variansi intensitas rendah merupakan blok homogen dan pada blok inilah akan disisipkan pesan. Watermark dalam hal ini adalah copyrightmark/ invisible logo atau penanda kepemilikan. Homogeneity Image merupakan blind watermarking dimana tidak memerlukan cover image pada proses ekstraksinya. Pada penelitian ini juga dilakukan pengujian hasil watermarking serta melakukan perbandingan dengan watermarking berbasis blok.Kata Kunci : homogeneity in image, watermarking, copyright-mark, invisibleABSTRACT: The ease of distributing digital media, specially using Internet, apparently brings the negative impact for the effort of copyright protection on digital media. Digital watermarking as one of solution to overcome these problems, facing the question of robustness against the distortion that could be happens along the distribution process.In this final research, it will be implemented and analysed digital image watermarking with homogeneity in image, This scheme works on spatial domain with a block-based technique for inserting a copyright mark (invisible logo) into an image and proposed a watermarking scheme to get imperceptibility and robustness. In this proposed method original image devided into bloks, a block of 8x8 pixel or 4x4 pixel, an then one bit binary watermark embedded into one selected blok. A block is selected with having small variance of intensities and it is called Homogenous block. In this research, the result of watermarking also tested with manipulate watermarked image using image smoothing, jpeg compression and image cutting and then each result compared with blockbased method.Keyword: homogeneity in image, watermarking, invisible logo, spatial domain

Non Oblivious Watermarking Technique for JPEG2000 Compressed Images Using Arnold Scrambling of Unequal Size Watermark Blocks

In this paper, a watermarking technique for JPEG2000 compressed image is proposed. Scrambling of secret message is performed block-wise using Arnold Transform. Secret message is divided into non-overlapping blocks of unequal size and then Arnold transform is applied on each block and secret key is generated based on the periodicity of each block. Scrambled secret message is embedded into qualified significant wavelet coefficients of a cover image. After embedding the secret message into wavelet coefficients, the remaining processes of JPEG2000 standard are executed to compress the watermarked image at different compression rates. Scaling Factor (SF) is used to embed watermark into wavelet coefficients and the value of SF is stored into COM box of the code stream of JPEG2000 compressed image and this SF value and secret key are used to extract the embedded watermark on the receiver side. The performance of the proposed technique is robust to a variety of attacks like image cropping, salt and pepper noise, and rotation. Proposed technique is compared with the existing watermarking techniques for JPEG2000 compressed images to show its effectiveness

Spread spectrum-based video watermarking algorithms for copyright protection

Merged with duplicate record 10026.1/2263 on 14.03.2017 by CS (TIS)Digital technologies know an unprecedented expansion in the last years. The consumer can now benefit from hardware and software which was considered state-of-the-art several years ago. The advantages offered by the digital technologies are major but the same digital technology opens the door for unlimited piracy. Copying an analogue VCR tape was certainly possible and relatively easy, in spite of various forms of protection, but due to the analogue environment, the subsequent copies had an inherent loss in quality. This was a natural way of limiting the multiple copying of a video material. With digital technology, this barrier disappears, being possible to make as many copies as desired, without any loss in quality whatsoever. Digital watermarking is one of the best available tools for fighting this threat. The aim of the present work was to develop a digital watermarking system compliant with the recommendations drawn by the EBU, for video broadcast monitoring. Since the watermark can be inserted in either spatial domain or transform domain, this aspect was investigated and led to the conclusion that wavelet transform is one of the best solutions available. Since watermarking is not an easy task, especially considering the robustness under various attacks several techniques were employed in order to increase the capacity/robustness of the system: spread-spectrum and modulation techniques to cast the watermark, powerful error correction to protect the mark, human visual models to insert a robust mark and to ensure its invisibility. The combination of these methods led to a major improvement, but yet the system wasn't robust to several important geometrical attacks. In order to achieve this last milestone, the system uses two distinct watermarks: a spatial domain reference watermark and the main watermark embedded in the wavelet domain. By using this reference watermark and techniques specific to image registration, the system is able to determine the parameters of the attack and revert it. Once the attack was reverted, the main watermark is recovered. The final result is a high capacity, blind DWr-based video watermarking system, robust to a wide range of attacks.BBC Research & Developmen