• The Transactions of the Korean Institute of Electrical Engineers P
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• v.59 no.4
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• pp.390-394
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• 2010

This paper describes a study on developing an insert and detect system of digital watermark to the MPEG-2 coder and decoder. Digital watermark inserting system substitutes a coefficient among the DCT coefficients for new one. This replacement performs in MPEG-2 PS format. Watermark detecting system analyzes the input data stream of MPEG-2 and detect the probability of occurrence of a specific code or watermarking code. Our inserting system had very high invisibility and the PSNR of the results was 130 dB around. And our detection rate of watermark was over 99% in digital format and over 85% in analog captured format according to the quality of contents.

• Proceedings of the Korea Multimedia Society Conference
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• 2004.05a
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• pp.103-106
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• 2004

본 논문은 인터넷을 이용한 방송 서비스에서 저작권 보호 및 저작물 식별을 위한 고유 식별 정보(unique identification)를 삽입, 추출하는 기술을 제안한다. 인터넷을 통한 방송 서비스의 활성화를 위해서는 저작권의 보호와 저작물의 불법 사용 방지, 저작물에 대한 저작권료 지불, 그리고 차후에 불법 사용자의 적발 등을 할 수 있는 기술이 필요하다. 본 논문에서 제안하는 기술은 사용자 관련 정보와 음악의 식별 정보를 저작물에 삽입하여 다운로드 받은 음악 파일이나 또는 청취 중에 녹음한 음악 파일의 불법 복제를 막는 방법이다. 저작물을 불법으로 유통시킬 경우에 유통된 음악 파일에서 삽입된 식별코드를 추출하여 음악 파일의 불법 유통경로를 추적하여 불법 사용자를 적발할 수 있도록 하였다. 이러한 기능을 만족시키기 위해서 인터넷 서비스에서 널리 이용되는 MP3, AAC, WMA 등과 같은 손실 압축을 거친 이후에도 삽입된 워터마크를 검출할 수 있으며, 일반 사용자들이 손쉽게 접할 수 있는 섞어 신호처리에도 강인한 특성을 갖는 기술을 제안한다.

• Journal of the Korea Society of Computer and Information
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• v.10 no.3 s.35
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• pp.151-159
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• 2005

Traditional watermarking technologies are symmetric method which embedding and detection keys are same. Although the symmetric watermarking method is easy to detect the watermark, this method has weakness against to malicious attacks to remove or modify the watermark information when the symmetric key is disclosure. Recently, the asymmetric watermarking method that has different keys to embed and detect is watched several researchers as a next generation watermarking technology. In this paper, we have expanded search space of secret key using the solution set of linear simultaneous equations. Secret key is generated by secure linear transformation method to prevent of guessing secret key from public key, and the correlation value between secret key and public key is high. At theresults, the multi bits information can be embedded and high correlation value was detected after JPEG compression.

• The KIPS Transactions:PartC
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• v.12C no.3 s.99
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• pp.379-386
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• 2005

Traditional watermarking technologies are symmetric method which embedding and detection keys are same. Although the symmetric watermarking method is easy to detect the watermark, has method has weakness against to malicious attacks to remove or modify the watermark information when the symmetric key is disclosure. Recently, the asymmetric watermarking method that has different keys to embed and detect is watched several researchers as a next generation watermarking technology. In this paper, we have expanded search space of secret key using the solution set of linear simultaneous equations. Secret key is generated by secure linear transformation method to prevent of guessing secret key from public key, and the correlation value between secret key and public key is high. At the results, the multi bits information can be embedded and high correlation value was detected after JPEG compression.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.241-246
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• 2004

Medical images are being managed more by PACS in general medical institutions. It is important to protect patients from being invaded their privacy related to the images. It is also necessary to confirm the ownership, the right of properity of the medical images and notice whether the data are modified. In this paper, we propose a robust watermarking against RST attacks in medical images on the PACS. The proposed scheme modifies and improves Log-Polar Mapping and Fourier Mellin Transform in order to realize and recover serious image degradation and watermark data loss caused by the conversion between cartesian coordinate and log-polar coordinate. We used the radius and theta Look Up Table to solve the realization of the Fourier Mellin Transform, and inserted a watermark into 2D-DFT magnitudes using Spread Spectrum. Experimental results shows that this method are robust to several attack.

• Journal of Korea Multimedia Society
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• v.10 no.11
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• pp.1417-1426
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• 2007

As one of schemes to protect multimedia content. it is the selective encryption scheme to encrypt partially multimedia content. Compared AES(advanced encryption standard) of traditional encryption, the selective encryption scheme provides low security but is applicable to applications of multimedia content not to require high secrecy. In this paper, we improve the image scrambling scheme proposed by Van De Ville which scrambles an image without bandwidth expansion using DPSS(discrete prolate spheroidal sequence) to make it more secure based on Shujun's research which verifies the secrecy of Van De Ville's scheme. The proposed method utilizes an orthonormalized random matrix instead of Hadamard matrix for secret matrix and to add it for providing high secrecy against statistical attack or known-plaintext attack using some statistical property or estimate of secret matrix from a scrambled image. The experimental results show that the proposed method is more secure than the existing scheme. In addition, we show that the proposed method can be applied to access control or copy control of watermarking application.

• The KIPS Transactions:PartB
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• v.8B no.5
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• pp.579-586
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• 2001

Digital watermarking is to embed imperceptible mark into image, video, audio, and text data to prevent the illegal copy of multimedia data. arbitrary modification, and also illegal sales of the copies without agreement of copyright ownership. In this paper, we study for the embedding and extraction of watermark key using wavelet in the luminance signal in order to implement the system to protect the copyright for image MPEG. First, the original image is analyzed into frequency domain by discrete wavelet transform. The RSA(Rivest, Shamir, Aldeman) public key of the coded target is RUN parameter of VLD(variable length coding). Because the high relationship among the adjacent RUN parameters effect the whole image, it prevents non-authorizer not to possess private key from behaving illegally. The Results show that the proposed method provides better moving picture and the distortion more key of insert than direct coded method on low-frequency domain based DCT.

• Proceedings of the Korean Information Science Society Conference
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• 2006.10c
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• pp.601-605
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• 2006

의료영상은 디지털이라는 속성으로 인해서 일상생활에 적용되는 저작권법으로 저작권을 보호한다는 것이 어렵다. 특히 의료 영상은 복사를 하면 또 하나의 원본이 생성되므로, 의료 영상 이미지를 생산해 내는 사람의 입장에서는 똑같은 원본을 자신도 모르는 사이에 다른 사람에게 전달하게 된다. 그렇게 되면 과연 누가 이 디지털 작품을 만들었는지에 대한 의료 분쟁이 생길 수밖에 없다. 디지털시대의 의료 환경에서 필수 불가결하게 제기될 수 있는 의료영상보안은 특히 우리나라처럼 의료보험의 부당 청구가 사회적인 큰 물의를 일으키고 있는 시점에서 많은 관심과 연구가 필요하다. 따라서 이 분야의 핵심적인 문제점을 도출하고, 문제점 개선을 위해서 워터 마크를 통해 영상 보안 기법을 제안하였다. 그러나 의료영상의 대표적인 특징인 무결성을 보장 받지 못해 법적인 인증에는 한계가 있음을 알 수 있었다.

• The KIPS Transactions:PartB
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• v.18B no.1
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• pp.1-10
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• 2011

Reversible watermarking inserts watermark into digital media in such a way that visual transparency is preserved, which enables the restoration of the original media from the watermarked one without any loss of media quality. It has various applications, where high capacity and high visual quality are major requirements. This paper presents a new effective multi-round embedding scheme for the differential histogram-based reversible watermarking that satisfies high capacity requirements of the application. The proposed technique exploits the row-column cross scanning to fully utilize the locality of images when multi-round embedding phase to the message inserted image. Through experiments using multiple kinds of test images, we prove that the presented algorithm provides 100% reversibility, effectiveness of multi-round embedding, and higher visual quality, while maintaining the induced-distortion low.

• Journal of Digital Convergence
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• v.10 no.5
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• pp.185-191
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• 2012

This study deals with the technical approach related to the protection of digital video contents copyright, which has currently become a major issue in the digital contents market. With the production and distribution of digital video contents rapidly increasing, various policies and technical approaches are being made in relation to the protection of intellectual property rights. The technical approach from a DRM (Digital Rights Management) perspective was made from various angles, but its limitations have also been exposed in terms of convenience and quality. In this study, rather than the existing encoding certification and watermark technologies, it introduces technical approaches from a content-based copy detection method, while suggesting a copy detection method using the representative color sequence. In particular, this study takes into consideration the distribution environment of the domestic video market and deals with the technical approach in a direction that can control the illegal distribution of high quality videos.