• Title/Summary/Keyword: watermark

Search Result 785, Processing Time 0.181 seconds

Content Adaptive Watermarkding Using a Stochastic Visual Model Based on Multiwavelet Transform

  • Kwon, Ki-Ryong;Kang, Kyun-Ho;Kwon, Seong-Geun;Moon, Kwang-Seok;Lee, Joon-Jae
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.1511-1514
    • /
    • 2002
  • This paper presents content adaptive image watermark embedding using stochastic visual model based on multiwavelet transform. To embedding watermark, the original image is decomposed into 4 levels using a discrete multiwavelet transform, then a watermark is embedded into the JND(just noticeable differences) of the image each subband. The perceptual model is applied with a stochastic approach fer watermark embedding. This is based on the computation of a NVF(noise visibility function) that have local image properties. The perceptual model with content adaptive watermarking algorithm embed at the texture and edge region for more strongly embedded watermark by the JND. This method uses stationary Generalized Gaussian model characteristic because watermark has noise properties. The experiment results of simulation of the proposed watermark embedding method using stochastic visual model based on multiwavelet transform techniques was found to be excellent invisibility and robustness.

  • PDF

Image Watermarking Algorithm using Spatial Encryption (공간적 암호화를 사용하는 영상 워터마킹 기법)

  • Jung, Soo-Mok
    • The Journal of the Convergence on Culture Technology
    • /
    • v.6 no.1
    • /
    • pp.485-488
    • /
    • 2020
  • In this paper, a technique for securely concealing the watermark, which is intellectual property information, in the image pixel LSB using spatial encryption is proposed. The proposed watermarking technique can be effectively used to protect intellectual property of images. The proposed technique can be used to extract watermark without loss from the stego-image, which is a hidden image of spatially encrypted watermark. The experimental results confirmed the superiority of the proposed technique. As a result of performing watermarking using the proposed technique, the image quality of the stego-image is higher than 51 dB, so humans cannot visually recognize the presence of a watermark. Due to the watermark is spatially encrypted, the security of the watermark is excellent.

Generation and Protection of Efficient Watermark Signals and Image Quality Preservation in Transmission Channel Using Turbo Coding (효과적인 워터마크 신호의 생성과 보호 및 터보코딩을 이용한 전송채널상에서의 화질 보존)

  • Cho, Dong-Uk;Bae, Young-Lae
    • The KIPS Transactions:PartB
    • /
    • v.9B no.1
    • /
    • pp.91-98
    • /
    • 2002
  • In this paper, an implementation method of the efficient image transmission stage using watermarking and channel ceding is proposed. Usually, image communication system consists of both a transmitter part and a receiver part. The transmitter part takes charge of copyright protection of the generated image data, and image coding and compression that can deal with channel noises when transmitting. In the transmitter part, we propose a channel coding method which protects both the watermark signal and the original signal for protecting the copyright of image data and solving channel noises when transmitting. Firstly, copyright protection of image data is conducted. For this, image structure analysis is performed, and both the improvement of image quality and the generation of the watermark signal are made. Then, the histogram is constructed and the watermark signals are selected from this. At this stage, by embedding of the coefficients of curve fittness into the lower 4 bits of the image data pixels, image quality degradation due to the embedding of watermark signals are prevented. Finally, turbo coding, which has the most efficient error correction capability in error correction codes, has been conducted to protect signals of watermark and preserved original image quality against noises on the transmission channel. Particularly, a new interleaving method named "semi random inter]easer" has been proposed.

A Study on Blind Watermarking Technique of Digital Image using 2-Dimensional Empirical Mode Decomposition in Wavelet Domain (웨이블릿 평면에서의 2D-EMD를 이용한 디지털 영상의 블라인드 워터마킹 기술에 관한 연구)

  • Lee, Young-Seock;Kim, Jong-Weon
    • Journal of Internet Computing and Services
    • /
    • v.11 no.2
    • /
    • pp.99-107
    • /
    • 2010
  • In this paper a blind watermarking algorithm for digital image is presented. The proposed method operates in wavelet domain. The watermark is decomposed into 2D-IMFs using BEMD which is the 2-dimensional extension of 1 dimensional empirical mode decomposition. The CDMA based on SS technique is applied to watermark embedding and detection process. In the watermark embedding process, each IMF of watermark is embedded into middle frequency subimages in wavelet domain, so subimages just include partial information about embedded watermark. By characteristics of BEMD, when the partial information of watermark is synthesized, the original watermark is reconstructed. The experimental results show that the proposed watermarking algorithm is imperceptible and moreover is robust against JPEG compression, common image processing distortions.

Storage Feature-Based Watermarking Algorithm with Coordinate Values Preservation for Vector Line Data

  • Zhou, Qifei;Ren, Na;Zhu, Changqing;Tong, Deyu
    • KSII Transactions on Internet and Information Systems (TIIS)
    • /
    • v.12 no.7
    • /
    • pp.3475-3496
    • /
    • 2018
  • Most of current watermarking algorithms for GIS vector data embed copyright information by means of modifying the coordinate values, which will do harm to its quality and accuracy. To preserve the fidelity of vector line data and protect its copyright at the same time, a lossless watermarking algorithm is proposed based on storage feature in this paper. Firstly, the superiority of embedding watermark based on storage feature is demonstrated theoretically and technically. Then, the basic concepts and operations on storage feature have been defined including length and angle of the polyline feature. In the process of embedding watermark, the watermark information is embedded into directions of polyline feature by the quantitative mechanism, while the positions of embedding watermark are determined by the feature length. Hence, the watermark can be extracted by the same geometric features without original data or watermark. Finally, experiments have been conducted to show that coordinate values remain unchanged after embedding watermark. Moreover, experimental results are presented to illustrate the effectiveness of the method.

Watermarking Extraction Algorithm Usi Frequency Trans form in Geometric Attack (기하학적 공격에 대한 영상의 주파수 변환 Watermarking 검출 알고리즘 개발)

  • 배준수;장진수;이문호
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.213-216
    • /
    • 2001
  • 본 논문은 DCT, FFT 및 Wavelet 등과 같은 주파수 영역에 의한 Watermarking 기법에서 정확한 Watermark를 검출하기 위하여 제안한 알고리즘이다. 본 논문에서 사용한 알고리즘은 기존의 왜곡된 영상에서 원 영상의 주파수 변환 값을 제거하여 왜곡된 상태의 영상 값에서 삽입된 Watermark를 검출하는 알고리즘에서 벗어나 왜곡된 값을 완전히 제거한 상태에서 영상의 Watermark를 검출함으로써 보다 완벽한 Watermark를 검출 할 수 있는 향상된 알고리즘을 제안하였다.

  • PDF

A Blind Watermarking Technique Using Difference of Approximation Coefficients in Wavelet Domain (웨이블릿 영역에서 근사 계수의 증감 정보를 이용한 블라인드 워터마크)

  • 윤혜진;성영경;최태선
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.219-222
    • /
    • 2002
  • In this paper, we propose a new blind image watermarking method in wavelet domain. It is necessary to find out watermark insertion location in blind watermark. We use horizontal and vertical difference of LL components to select watermark insertion location, because increment or decrement of successive components is rarely changed in LL band. A pseudo-random sequence is used as a watermark. Experimental results show that the proposed method is robust to various kinds of attacks such as JPEG lossy compression, averaging, median filtering, resizing, histogram equalization, and additive Gaussian noise.

  • PDF

Digital Watermark Algorithm Based on Energy Distribution of Subband Tree Structure in Wavelet Domain (웨이블릿 영역에서 부대역간 트리구조의 에너지 분포에 의한 디지털 워터마크 삽입 알고리즘)

  • 서영호;최순영;박진영;김동욱
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.85-88
    • /
    • 2002
  • In this paper, the proposed watermark algorithm is based on energy distribution of the subband coefficients in the frequency domain and edge of the original image in the spacial domain. Out of these information, the KeyMap which decides the embedded position of watermark is produced. And then the binary watermark is embedded into the wavelet coefficient of LL3 subband using KeyMap and LFSR(Linear Feedback Shift Register).

  • PDF

An Iterative Watermarking Method Using Human Visual System (인간 시각 시스템을 이용한 반복적 워터마킹 기법)

  • 김희정;김지홍
    • Proceedings of the IEEK Conference
    • /
    • /
    • pp.267-270
    • /
    • 2002
  • In this paper, a new watermarking method using an iterative scheme is proposed. The proposed method consists of two parts: watermark generation and its insertion. In the watermark generation, random signals with normalized distribution N(0,1) are produced and modified using an iterative scheme. In the watermark insertion, the resulting watermark signals are inserted into selected transform coefficients with various scaling parameters in order to achieve the invisibility and robustness against illegal attacks. The simulation results show that the proposed method has good performance for various attacks including image compression, filtering, etc.

  • PDF

Incremental Watermarking using Complex Wavelet Transform (콤플렉스 웨이블릿 변환을 이용한 점진적 워터마킹)

  • Lee Na-Young;Kim Won;Kim Kwan-Jung;Kim Gye-Young
    • Journal of Internet Computing and Services
    • /
    • v.4 no.3
    • /
    • pp.39-46
    • /
    • 2003
  • Generally, the existing watermarking techniques for copyright protection of a digital image are fragile in geometric distortion and all watermark extractions need the same time regardless of degree of distortion. In this paper, we propose the incremental watermarking technique that used a Complex Wavelet Transform(CWT) in order to solve these problems. The proposed incremental watermarking technique embeds a watermark in a phase component after a CWT with an original image, and a watermark is extracted from an watermarked image by stages. A watermark owner can insist on copyright of an image after comparing a correlation between the extracted watermark and the original watermark if it is larger than the threshold. Also, the incremental watermark extraction determines the extraction time of a watermark by the level of distortion. The proposed technique through performance evaluation displayed that it was robust in geometric distortion than the existing watermarking technique.

  • PDF