scholarly journals Digital Video Watermarking for Copyright Labelling

2021 ◽  
Vol 10 (5) ◽  
Author(s):  
Fitria Ilhami Ikromina Ami ◽  
Erik Iman Heri Ujianto Erik
Keyword(s):  
Fourier Transform ◽  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Discrete Fourier Transform ◽  
Discrete Cosine Transform ◽  
Digital Watermarking ◽  
Video Watermarking ◽  
Discrete Wavelet ◽  
Cosine Transform ◽  
Digital Video Watermarking

Penggunaan konten multimedia di internet kini semakin berkembang, terutama dalam video digital. Pemalsuan, penipuan, dan penjarahan konten video menyebabkan masalah karena pasokan sumber daya untuk berbagi konten. Hak cipta menjadi hal yang krusial dalam video digital untuk menghindari manipulasi dari pihak yang tidak bertanggung jawab. Ada banyak cara yang bisa dilakukan untuk melabeli hak cipta ke dalam sebuah video. Salah satunya adalah digital watermarking. Pembuatan air digital digunakan untuk mencegah replikasi ilegal atau eksploitasi konten digital, melindungi konten digital, dan menghindari manipulasi multimedia secara ilegal. Penggunaan beberapa metode seperti Discrete Wavelet Transform (DWT), Discrete Cosine Transform (DCT), dan Discrete Fourier Transform (DFT) untuk pelabelan hak cipta video akan dibandingkan berdasarkan imperceptibility dan robustness setelah beberapa manipulasi diterapkan ke dalam video yang disisipkan-watermark. Dari segi imperceptibility, metode DWT menghasilkan nilai PSNR sebesar 45,62435 dB, metode DCT menghasilkan nilai PSNR sebesar 45.89422 dB, dan metode DFT menghasilkan nilai PSNR sebesar 45.77747 dB. Rerata PSNR dari ketiga metode tersebut adalah 45.76535 dB. Artinya, video yang disisipkan tanda air tampak mirip dengan yang disisipkan. Dengan demikian, dari percobaan dapat disimpulkan bahwa metode DWT, DCT, dan DFT yang diterapkan menunjukkan bahwa video yang diberi watermark masih dalam kualitas yang baik yaitu wajar dan memenuhi imperceptibility. Dari segi kekokohan, NC mean metode DCT adalah 0,63974, metode DCT adalah 0,755839, dan metode DFT adalah 0,745442. Hal ini menunjukkan bahwa hasil ekstraksi watermark dari ketiga metode tersebut sama dengan hasil watermark aslinya. Dengan kata lain, semua tanda air pada ketiga metode ini dapat diekstraksi dengan baik meskipun serangan dikirimkan kepada mereka. Dari tingkat uji imperceptibility dan robustness pada metode DWT, DCT, dan DFT, dapat dikatakan bahwa metode DCT lebih baik daripada metode DWT dan DFT karena performansinya yang tinggi pada PSNR dan NC.

scholarly journals A Color Image Blind Digital Watermarking Algorithm Based on QR Code

2021 ◽  
Author(s):  
Xuecheng Gong ◽  
Wanggen Li
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Digital Watermarking ◽  
Color Image ◽  
Rapid Development ◽  
Discrete Wavelet ◽  
Qr Code ◽  
Cosine Transform ◽  
Small Capacity

With the rapid development of network technology and multimedia, the current color image digital watermarking algorithm has the problems of small capacity and poor robustness. In order to improve the capacity and anti-attack ability of digital watermarking. A color image blind digital watermarking algorithm based on QR code is proposed. The algorithm combines Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT). First, the color image was converted from RGB space to YCbCr space, and the Y component was extracted and the second-level discrete wavelet transform is performed; secondly, the LL2 subband was divided into blocks and carried out discrete cosine transform; finally, used the embedding method to embed the Arnold transform watermark information into the block. The experimental results show that the PSNR of the color image embedded with the QR code is 56.7159 without being attacked. After being attacked, its PSNR is more than 30dB and NC is more than 0.95. It is proved that the algorithm has good robustness and can achieve blind watermark extraction.

scholarly journals Blind Extraction of Digital Watermarking Algorithm for Color Images

2021 ◽  
Vol 13 (2) ◽  
pp. 15-26
Author(s):  
Xuecheng Gong ◽  
Wanggen Li ◽  
Wang Jing
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Digital Watermarking ◽  
Digital Images ◽  
Color Image ◽  
Discrete Wavelet ◽  
Qr Code ◽  
Cosine Transform ◽  
Blind Extraction

Digital watermark technology hides copyright information in digital images, effectively protecting the copyright of digital images. At present, the color image digital watermarking algorithm still has defects such as the inability to balance robustness, invisibility and the weak anti-attack ability. Aiming at the above problems, this paper studies the digital watermarking method based on discrete wavelet transform and discrete cosine transform. Then this paper proposes a color image blind digital watermarking algorithm based on QR code. First, convert the color image from RGB space to YCbCr space, extract the Y component and perform the second-level discrete wavelet transform. secondly, block the LL2 subband and perform the discrete cosine transform. finally, use the embedding method to convert the watermark information after the Arnold transform embedded in the block. The experimental results show that the PSNR of the color image embedded with the QR code is 56.7159 without being attacked. After being attacked, its PSNR and NC values are respectively 30dB and 0.95 or more, which proves that the algorithm has good robustness and can achieve watermarking blind extraction.

Image Compression Using Discrete Cosine Transform & Discrete Wavelet Transform

2013 ◽  
Vol 002 (001) ◽  
pp. 25-27 ◽  
Author(s):  
Anurag Tiwari ◽  
◽  
Payal Chandrakant ◽  
Trip ti ◽  
Surabhi Chaudhary ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Image Compression ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Discrete Wavelet ◽  
Cosine Transform

A DCT Fractional bit replacement based Dual Watermarking Algorithm for Image Authentication

2020 ◽  
Vol 13 ◽  
Author(s):  
Rahul Dixit ◽  
Amita Nandal ◽  
Arvind Dhaka ◽  
Yohan Varghese ◽  
Vardan Agarwal
Keyword(s):  
Wavelet Transform ◽  
Singular Value Decomposition ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Singular Value ◽  
Discrete Wavelet ◽  
Cosine Transform ◽  
Robust Watermark ◽  
Dual Watermarking ◽  
Value Decomposition

: Watermarking is a process of embedding a message inside a digital signal like an image, video or text. It is used for several key reasons such as authenticity verification, ownership recognition and hidden communication. In this paper, we discuss about image watermarking, where secret messages are stored in images. Introduction: We propose a dual watermarking approach, which is based on Discrete Cosine Transform, Discrete Wavelet Transform and Singular Value Decomposition methods. This paper considers one watermark as robust and other water mark as fragile. Method: The robust watermark is embedded in Discrete Wavelet Transform- Singular Value Decomposition - domain and is used to transmit hidden messages. The fragile watermark is embedded in Discrete Cosine Transform domain and is used for verification of secret message of the robust watermark. The proposed algorithm is tested in the experimental results section and shows promising results against denoising, rotation, translation and cropping attacks. Result: The results show that the performance of the proposed algorithm in terms of mean squared error, structural similarity and peak signal to noise ratio is S4considerable as compared with the existing methods. Discussion: We present the comparison results with Himanshu et. al. in table 10, from which we can see that our method performs better with gaussian noise and rotational attack only lacking with Salt and Pepper noise. Fig. 7 and Fig. 8, in terms of resulting PSNR shows the variation of noise variance and degree of rotation. From the graphs it is evident that out method performs better against Gaussian and rotational attack. Conclusion: In this paper a dual watermarking method is proposed in which one watermark is fragile which is called as authentication watermark whereas the other watermark is robust and is called as the information watermark. The authentication watermark is embedded in the fractional part of DCT domain in the cover image and the information watermark is embedded in the diagonal vector of the LL sub-band.

An Efficient Transceiver Scheme for SC-FDMA Systems Based on Discrete Wavelet Transform and Discrete Cosine Transform

2015 ◽  
Vol 83 (4) ◽  
pp. 3133-3155 ◽  
Author(s):  
Faisal S. Al-Kamal ◽  
Emad S. Hassan ◽  
Mohammed Abd El-Naby ◽  
Farid Shawki ◽  
Said E. El-Khamy ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
Discrete Cosine Transform ◽  
Discrete Wavelet ◽  
Cosine Transform
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