• Title/Summary/Keyword: Digital Watermarking Technique

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Performance Comparison of Wavelet Transform Based Watermarking and DCT Transform Based Watermarking (Wavelet 변환과 DCT 변환을 이용한 워터마킹에 관한 연구)

  • 장용원;한승수;김인택
    • Proceedings of the IEEK Conference
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    • 2000.11c
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    • pp.85-88
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    • 2000
  • With the rapid growth of network distributions of digitized media(audio, image, and video), there is an urgent need for copyright protection. For now watermarking is a well-known technique for copyright protection of digital data. To embed a digital watermark to the image, discrete cosine transform(DCT) and wavelet transform are commonly used. In this paper, the performance of the DCT based watermarking technique and wavelet based watermarking technique were compared and the influences of the parameter a that decides the strength of the watermarking data were considered.

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Wavelet based Watermarking Technique for the Digital Contents Protection (지적재산권 보호를 위한 웨이블릿 기반 워터마킹 기술)

  • 송학현;김윤호
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.4
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    • pp.912-917
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    • 2004
  • The increase of illegal usage and conflict in digital content market would diminish motivation of creators for their work, furthermore break down digital content market on cyber-space. Watermarking technology support to the legal users by the protection technique based on the digital content copyright protection method(DRM). Most of previous digital watermarking have embeded to the content. In this paper, we propose a wavelet based watermarking method which is used for implementing in the frequency domain.

Digital Watermarking using Phase hologram and Optical Interferometer (위상 홀로그램과 광학적 간섭계를 이용한 디지털 워터마킹)

  • 김병열;조규보;신창목;서동환;김수중
    • Proceedings of the IEEK Conference
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    • 2002.06b
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    • pp.87-90
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    • 2002
  • A digital watermark is an invisible mark embedded in a digital image which used for copyright protection. In this paper, we propose a new optical watermarking system. A optical watermarking system is applied for digital watermarking by phase hologram and Mach-Zehnder interferometer. A optical watermarking technique to be hidden is phase modulated in a random patten, and its Fourier-transformed hologram image is superposed on a content image. The autentication information extract by using Mach-zehnder interferometer.

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Digital Watermarking using Phase hologram and Optical Interferometer (위상 홀로그램과 광학적 간섭계를 이용한 디지털 워터마킹)

  • 김병열;조규보;신창목;서동환;김수중
    • Proceedings of the IEEK Conference
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    • 2002.06a
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    • pp.227-230
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    • 2002
  • A digital watermark is an invisible mark embedded in a digital image which used for copyright protection. In this paper, we propose a new optical watermarking system. A optical watermarking system is applied for digital watermarking by phase hologram and Mach-Zehnder interferometer. A optical watermarking technique to be hidden is phase modulated in a random patten, and its Fourier-transformed hologram image is superposed on a content image. The autentication information extract by using Mach-zehnder interferometer.

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A Study on Invisibility Improvement of Watermarking Image (워터마킹 영상의 비가시성 개선에 관한 연구)

  • Kim, Hyeong-Gyun;Lee, Yang-Weon
    • Journal of Advanced Navigation Technology
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    • v.11 no.3
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    • pp.329-336
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    • 2007
  • The use of digital imaging technique and digital contents based on internet has grown rapidly for last several years, and the needs of digital image protection become more important. For the purpose of copyright protection on digital image, the verification of authentication techniques like content authentication, ownership authentication, illegal copy and etc are needed. Digital watermarking, the invisible encryption technique to insert digital watermark into image, the sophisticated perceptual information should be used for providing transparency and robustness of images on watermarking process. In this paper, we implement the digital watermarking algorithm for preventing forged attack, ownership protection and authentication by transforming the wavelet algorithms in frequency domain in terms of human visual system.

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A New Watermarking Algorithm Using the Edge and PN Code (에지와 대역확산기술을 이용한 디지털 워터마킹 기법)

  • Song Sang-Ju;Lee Doo-Sung
    • Journal of the Korea Society of Computer and Information
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    • v.9 no.4 s.32
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    • pp.13-18
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    • 2004
  • In this paper, we proposed a new digital watermarking technique. It uses frequency domain of discrete wavelet transform(DWT). watermarking technique is one of the most important tools for DRM(Digital Right Management) We proposed a new algorithm watermark insertion and detection. This technique cleats the watermark sequence using the edge image, spread spectrum technique and DWT. We tested the technique with various attacks. and found that it satisfies the watermarking evaluation criteria. Cox similarity measurement value is more than 6 on the Lena image and PSNR is more than 40dB on JPEG, Collusion. Clopping and Scatting. By the result, we proved that the new technique satisfies the requirement of Digital contents distribution, which are undeletablility tenacity, statistical undetectablility.

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Audio Watermarking Technique Based on Digital Filter (디지털 필터를 이용한 오디오 워터마킹 기술)

  • 신승원;김종원;최종욱
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • 2001.11a
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    • pp.464-468
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    • 2001
  • In this paper, we propose a robust watermarking technique that accepts time scaling, pitch shift, add noise and a lot of lossy compression such as MP3, AAC, WMA. The technique is developed based on digital filtering. Being designed according to critical band of HAS (human auditory system), the digital filters nearly affect audio quality. Furthermore, before implementing digital filtering, wavelet transform decomposes the audio signal into several signals that is composed of specific frequencies. Designed digital filters scan the decomposed signal. The designed digital filter, band-stop filter, distorts and eliminates specific frequencies of audio signals. Watermarking detection can be accomplished by FFT (Fast Fourier Transform). Firstly, segments of audio signal are transformed by FFT. Then, the obtained amplitude spectrum by FFT is summed repeatedly. Finally the watermark detector can find filters used to watermark encoding based on eliminating frequencies. The suggested technique can embed 4bits/s in a robust manner.

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Removable Logo Watermarking Technique (제거 가능한 로고 워터마킹 기법)

  • Cho, Dong-Joon;Choi, Hyuk
    • The KIPS Transactions:PartD
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    • v.15D no.6
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    • pp.857-860
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    • 2008
  • In this paper, we propose a removable logo watermarking technique for copyright protection of digital image. Then, visible logo is inserted into digital image to protect copyright, and the information removed by the logo is embedded by a new quantization watermarking. In a legal usage, the image can be reconstructed without logo after watermarking detection process. Experiment results show that the proposed method maintains high image quality in both watermarked images and reconstructed images, and is practical and effective in protection of image copyright.

A Study on the Audio watermarking for High Quality Digital Audio (고음질 오디오를 위한 디지털 오디오 워터마킹에 관한 연구)

  • 김정태;구대성;이강현
    • Proceedings of the IEEK Conference
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    • 2000.06c
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    • pp.125-128
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    • 2000
  • In this paper, we proposed the high quality digital audio watermarking algorithm in the frequency domain. The spread spectrum technique is used to encrypted a stream of information by spreading the data as much of the frequency spectrum as possible. It's technique adapt well to data hiding in audio signal. We have used the perceptual model and MDCT/IMDCT for the high qualify digital audio watermarking. The proposed watermark algorithm preserved high quality audio data from watermark signal.

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Design of a New Audio Watermarking System Based on Human Auditory System (청각시스템을 기반으로 한 새로운 오디오 워터마킹 시스템 설계)

  • Shin, Dong-Hwan;Shin Seung-Won;Kim, Jong-Weon;Choi, Jong-Uk;Kim, Duck-Young;Kim, Sung-Hwan
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.51 no.7
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    • pp.308-316
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    • 2002
  • In this paper, we propose a robust digital copyright-protection technique based on the concept of human auditory system. First, we propose a watermarking technique that accepts the various attacks such as, time scaling, pitch shift, add noise and a lot of lossy compression such as MP3, AAC WMA. Second, we implement audio PD(portable device) for copyright protection using proposed method. The proposed watermarking technique is developed using digital filtering technique. Being designed according to critical band of HAS(human auditory system), the digital filers embed watermark without nearly affecting audio quality. Before processing of digital filtering, wavelet transform decomposes the input audio signal into several signals that are composed of specific frequencies. Then, we embed watermark in the decomposed signal (0kHz~11kHz) by designed band-stop digital filer. Watermarking detection algorithm is implemented on audio PD(portable device). Proposed watermarking technology embeds 2bits information per 15 seconds. If PD detects watermark '11', which means illegal song. PD displays "Illegal Song" message on LCD, skips the song and plays the next song, The implemented detection algorithm in PD requires 19 MHz computational power, 7.9kBytes ROM and 10kBytes RAM. The suggested technique satisfies SDMI(secure digital music initiative) requirements of platform3 based on ARM9E core.