Digital Watermarking using Multiscale Ridgelet Transform

The multi-resolution watermarking method for digital images proposed in this work. The multiscale ridgelet coefficients of low and high frequency bands of the watermark is embedded to the most significant coefficients at low and high frequency bands of the multiscale ridgelet of an host image, respectively. A multi-resolution nature of multiscale ridgelet transform is exploiting in the process of edge detection. Experimental results of the proposed watermarking method are compared with the previously available watermarking algorithm wavelet transform. Moreover, the proposed watermarking method also tested on images attached by Discrete Cosine Transform (DCT) and wavelet based lossy image compression techniques

Perbandingan Watermarking Citra dengan Alihragam Wavelet dan Discrete Cosine Transform

Abstract. Comparison of Image Watermarking with the Wavelet Variety Packs and Discrete Cosine Transform. Watermarking is one method of copyright protection to combat the spread of the work of someone illegally. In this study, we compare watermarking algorithm in wavelet region and Discrete Cosine Transform (DCT). Color image is used as the host image, while the watermark image is used as a binary image of size 1 / 16 image of the host. Embedding process is based on Human Visual System (HVS), so hopefully gained an invisible watermark (invisible watermark). Embedding process performed by the additive algorithm. In both variety packs developed, the watermark is inserted in the high frequency components of the image. Wavelet used is the wavelet db4. DCT 4x4 blocks are used, which is expected to reduce the computational load. Tests showed that the two watermarking algorithms are generally resistant to granting noise, geometric image operations and image processing operations. Watermarking algorithm that was developed less defend against attacks-down pass filter and median filter, but has a very good performance against an attack-pass filter above. Keywords: image watermarking, wavelet, Discrete Cosine Transform (DCT), Human Visual System (HVS) Abstrak. Watermarking merupakan salah satu metode proteksi hak cipta untuk menanggulangi penyebaran karya seseorang secara ilegal. Pada penelitian ini dilakukan perbandingan algoritma watermarking pada kawasan wavelet dan Discrete Cosine Transform (DCT). Citra warna digunakan sebagai citra host, sedangkan sebagai citra watermark digunakan citra biner berukuran 1/16 citra host. Proses embedding dilakukan berdasarkan Human Visual System (HVS), sehingga diharapkan diperoleh watermark yang tidak kelihatan (invisible watermark). Proses embedding dilakukan dengan algoritma aditif. Pada kedua alihragam yang dikembangkan, watermark disisipkan pada komponen frekuensi tinggi citra. Wavelet yang digunakan adalah wavelet db4. Sedangkan alihragam DCT yang digunakan adalah operasi blok 4x4, yang diharapkan dapat mengurangi beban komputasi. Pengujian menunjukkan bahwa kedua algoritma watermarking secara umum tahan terhadap pemberian derau, operasi geometris citra dan operasi-operasi pengolahan citra. Algoritma watermarking yang dikembangkan kurang bertahan terhadap serangan-serangan tapis lolos-bawah dan tapis median, namun mempunyai unjuk kerja yang sangat baik terhadap serangan tapis lolos-atas. Kata Kunci: watermarking citra, wavelet, Discrete Cosine Transform (DCT), Human Visual System (HVS

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

Perceptual Copyright Protection Using Multiresolution Wavelet-Based Watermarking And Fuzzy Logic

In this paper, an efficiently DWT-based watermarking technique is proposed to embed signatures in images to attest the owner identification and discourage the unauthorized copying. This paper deals with a fuzzy inference filter to choose the larger entropy of coefficients to embed watermarks. Unlike most previous watermarking frameworks which embedded watermarks in the larger coefficients of inner coarser subbands, the proposed technique is based on utilizing a context model and fuzzy inference filter by embedding watermarks in the larger-entropy coefficients of coarser DWT subbands. The proposed approaches allow us to embed adaptive casting degree of watermarks for transparency and robustness to the general image-processing attacks such as smoothing, sharpening, and JPEG compression. The approach has no need the original host image to extract watermarks. Our schemes have been shown to provide very good results in both image transparency and robustness.Comment: 13 pages, 7 figure