PSO Based Lossless and Robust Image Watermarking using Integer Wavelet Transform

In recent days, the advances in the broadcasting of multimedia contents in digital format motivate to protect this digital multimedia content form illegal use, such as manipulation, duplication and redistribution. However, watermarking algorithms are designed to meet the requirements of different applications, because, various applications have various requirements. This paper intends to design a new watermarking algorithm with an aim of provision of a tradeoff between the robustness and imperceptibility and also to reduce the information loss. This approach applies Integer Wavelet Transform (IWT) instead of conventional floating point wavelet transforms which are having main drawback of round of error. Then the most popular artificial intelligence technique, particle swarm optimization (PSO) used for optimization of watermarking strength. The strength of watermarking technique is directly related to the watermarking constant alpha. The PSO optimizes alpha values such that, the proposed approach achieves better robustness over various attacks and an also efficient imperceptibility. Numerous experiments are conducted over the proposed approach to evaluate the performance. The obtained experimental results demonstrates that the proposed approach is superior compared to conventional approach and is able to provide efficient resistance over Gaussian noise, sal

ROBUST INTEGER HAAR WAVELET BASED WATERMARKING USING SINGULAR VALUE DECOMPOSITION

This paper proposed a hybrid watermarking method that used dither quantization of Singular Value Decomposition (SVD) on average coefficients of Integer Haar Wavelet Transform (IHWT). The watermark image embeds through dither quantization process on singular coefficients value. This scheme aims to obtain the higher robustness level than previous method which performs dither quantization of SVD directly on image pixels value. The experiment results show that the proposed method has proper watermarked images quality above 38dB. The proposed method has better performance than the previous method in term of robustness against several image processing attacks. In JPEG compression with Quality Factor of 50 and 70, JPEG2000 compression with Compression Ratio of 5 and 3, average filtering, and Gaussian filtering, the previous method has average Normalized Correlation (NC) values of 0.8756, 0.9759, 0.9509, 0.9905, 0.8321, and 0.9297 respectively. While, the proposed method has better average NC values of 0.9730, 0.9884, 0.9844, 0.9963, 0.9020, and 0.9590 respectively

Robust Watermarking through Dual Band IWT and Chinese Remainder Theorem

CRT was a widely used algorithm in the development of watermarking methods. The algorithm produced good image quality but it had low robustness against compression and filtering. This paper proposed a new watermarking scheme through dual band IWT to improve the robustness and preserving the image quality. The high frequency sub band was used to index the embedding location on the low frequency sub band. In robustness test, the CRT method resulted average NC value of 0.7129, 0.4846, and 0.6768 while the proposed method had higher NC value of 0.7902, 0.7473, and 0.8163 in corresponding Gaussian filter, JPEG, and JPEG2000 compression test. Meanwhile the both CRT and proposed method had similar average SSIM value of 0.9979 and 0.9960 respectively in term of image quality. The result showed that the proposed method was able to improve the robustness and maintaining the image quality

ANALISIS OPTIMASI DIGITAL AUDIO WATERMARKING DENGAN TEKNIK SINGULAR VALUE DECOMPOSITION DAN QUANTIZATION INDEX MODULATION BERBASIS LIFTING WAVELET TRANSFORM MENGGUNAKAN ALGORITMA GENETIKA

ABSTRAK Pada perkembangan teknologi digital yang sangat pesat ini, telah mempermudah pengguna layanan internet untuk mengakses, menyalin, dan mengunggah suatu informasi media digital seperti teks, gambar, audio, dan video pada internet. Kemudahan inilah yang membuat penyedia atau pemilik sebuah konten audio digital khawatir dengan maraknya pembajakan yang dilakukan oleh beberapa orang yang tidak memiliki hak akan konten tersebut. Salah satu solusi yang tepat untuk menyelesaikan masalah tersebut adalah dengan menggunakan teknik digital watermarking. Dalam tugas akhir ini proses watermarking menggunakan metode LWT (Lifting Wavelete Transform), SVD (Singular Value Decomposition), QIM (Quantization Index Modulation), dan Algoritma Genetika. Audio pada penelitian ini menggunakan format (*wav.file). Host audio akan melalui metode LWT yang berfungsi untuk memisahkan host audio ke dalam domain sinyal rendah dan sinyal tinggi untuk menentukan tempat penyisipan data watermark. Kemudian pada proses SVD bertugas untuk memberikan ketahanan pada skema penyisipan yang digunakan. Pada proses penyisipan akan dilakukan menggunakan metode QIM yang kemudian diuji dengan beberapa serangan seperti BPF, resampling, time scale modification, dan lain-lain. Lalu hasilnya akan dioptimasi menggunakan algoritma genetika agar mendapatkan hasil yang optimal. Optimasi diperoleh parameter yang paling optimal yaitu menghasilkan ODG = -1.05193, SNR = 61.89326, BER = 0, kapasitas = 75 dan dengan level decomposition 1, panjang frame 32, threshold sebesar 0.008, kedalaman 32 bit audio dan kuantisasi QIM 10 bit. Jenis serangan yang digunakan adalah time scale modification. Kata Kunci : Audio watermarking, Lifting Wavelet Transform, Singular Value Decomposition, Quantizing Index Modulation, Algoritma Genetik

Robust Video Watermarking Algorithm based on DCT-SVD approach and Encryption

Sharing of digital media content over the internet is increasing everyday .Digital watermarking is a technique used to protect the intellectual property rights of multimedia content owners. In this paper, we propose a robust video watermarking scheme that utilizes Discrete Cosine Transform (DCT) and Singular Value Decomposition (SVD) for embedding a watermark into video frames. The proposed method uses encryption to make the watermark more robust against malicious attacks. The encryption key is used to modify the watermark before it is embedded in the video frames. The modified watermark is then embedded in the DCT and SVD coefficients of the video frames. The experimental results show that the proposed method provides better robustness against various attacks such as compression, noise addition, and filtering, while maintaining good perceptual quality of the watermarked video. The proposed method also shows better resistance against geometric attacks such as cropping, rotation, and scaling. Overall, the proposed method provides an effective solution for protecting the intellectual property rights of multimedia content owners in video distribution and transmission scenarios

QAM-DWT-SVD Based Watermarking Scheme for Medical Images

This paper presents a new semi-blind image watermarking system for medical applications. The new scheme utilizes Singular Value Decomposition (SVD) and Discrete Wavelet Transform (DWT) to embed a textual data into original medical images. In particular, text characters are encoded by a Quadrature Amplitude Modulation (QAM-16). In order to increase the security of the system and protect then the watermark from several attacks, the embedded data is submitted to Arnold Transform before inserting it into the host medical image. To evaluate the performances of the scheme, several medical images have been used in the experiments. Simulation results show that the proposed watermarking system ensures good imperceptibility and high robustness against several attacks