• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.800-803
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• 2004

This paper presents a wavelet-based digital watermarking technique for still images. The digital watermarking considering human visual system (HVS) to increase the robustness and perceptual invisibility of digital watermark. The watermarking embedding is modified discrete wavelet transform (DWT) coefficients of the subbands of the images. The human visual system is number of factors that effect the noise sensitivity of human eyes that is considered to increase the robustness and perceptual invisibility of digital watermark. The watermark detection is blind watermark ( original image is not required ). Experimental results successful against attacks by image processing such as add noise, cropping, filtering, JPEG and JPEG2000 compression.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2009년도 추계학술발표대회
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• pp.241-242
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• 2009

As software is becoming increasing important to the human society, so does the effort to produce them is also increasing.. All of these efforts can be at risk when source code of the application is reverse engineered by the software pirate. Many attempts have been made to protect Intellectual Property Rights (IPR); one of the newest attempts to protect IPR is software watermarking. It is used to prove ownership right when IPR are violated, and also prevents the bandit from altering the code for his own use. In this paper we are presenting a new technique for software watermarking know as Dictionary Based Software Watermarking (DBSW). DBSW works by embedding dummy instructions in source code with the help of predefined mapping already available in the dictionary. These instructions are identical to the normal instructions of the program and are hard to identify or to extract from the watermarked program. With the help of DBSW we not only can stop source code alteration but can also identify the buyer how has distributed the pirated copy.

• Journal of Information Processing Systems
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• 제13권2호
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• pp.340-347
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• 2017

A watermark is a signal added to the original signal in order to preserve the copyright of the owner of the digital content. The basic challenge for designing a watermarking system is a dilemma between transparency and robustness. If we want a higher rate of transparency, there has to be a compromise in terms of its robustness and vice versa. Also, until now, watermarking is generalized, resulting in the need for a specialized algorithm to work for a specialized image processing application domain. Our proposed technique takes into consideration the image characteristics for watermark insertion and it optimizes transparency and robustness. It achieved a 99.98% retrieval efficiency for an image blurring attack and counterfeits other attacks. Our proposed technique counterfeits almost all of the image processing attacks.

• Journal of Information Processing Systems
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• 제12권4호
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• pp.681-687
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• 2016

Today's modern world requires a digital watermarking technique that takes the redundancy of an image into consideration for embedding a watermark. The novel algorithm used in this paper takes into consideration the redundancies of spatial domain and wavelet domain for embedding a watermark. Also, the cryptography-based secret key makes the algorithm difficult to hack and help protect ownership. Watermarking is blind, as it does not require the original image. Few coefficient matrices and secret keys are essential to retrieve the original watermark, which makes it redundant to various intentional attacks. The proposed technique resolves the challenge of optimizing transparency and robustness using a Canny-based edge detector technique. Improvements in the transparency of the cover image can be seen in the computed PSNR value, which is 44.20 dB.

• 한국멀티미디어학회논문지
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• 제16권5호
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• pp.591-600
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• 2013

This paper addresses a feature-based robust watermarking scheme for digital images using a local invariant features of SURF (Speeded-Up Robust Feature) descriptor. In general, the feature invariance is exploited to achieve robustness in watermarking schemes, but the leakage of information about hidden watermarks from publicly known locations and sizes of features are not considered carefully in security perspective. We propose embedding and detection methods where the watermark is bound with circular areas and inserted into extracted circular feature regions. These methods enhance the robustness since the circular watermark is inserted into the selected non-overlapping feature regions instead of entire image contents. The evaluation results for repeatability measures of SURF descriptor and robustness measures present the proposed scheme can tolerate various attacks, including signal processing and geometric distortions.

• 한국멀티미디어학회논문지
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• 제9권12호
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• pp.1596-1606
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• 2006

There has been more increased the development of 3D technique since many 3D contents of 3D graphic model, 3D mobile/computer game, and 3D CAD have been serviced in Web or industry fields. Therefore, the watermarking system is more required to protect the copyright for 3D contents. Currently there has been researched about the watermarking for 3D graphic model of mesh or NURBS. However, watermarking technique based on CAD design drawing leaves something to be desired yet. This paper proposed the watermarking technique for 3D CAD design drawing using Line and Arc components. After drawing out Line and Arc components from designed drawing, we embed the watermark into both the length of Line component and the radius of Arc component. Experimental results verified that the proposed algorithm satisfies the transparency about watermarked drawing and also has the robustness against several attacks by using public CAD tool.

• 전자공학회논문지CI
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• 제43권6호
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• pp.71-82
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• 2006

3D 그래픽에서는 실시간 애니메이션을 위하여 이동, 회전, 스케일링 변환 노드로 구성되는 키프레임 애니메이션이 널리 이용되고 있다. 본 논문에서는 VRML 기반의 3D 애니메이션 상에서 CoordIndex 노드 내에 꼭지점 좌표를 이용한 기하학적 워터마킹 기법과 PositionInterpolator 노드 내에 키 값을 이용한 보간기 워터마킹 기법을 제안한다. 실험 결과로부터 제안한 방법이 각종 기하학적 공격 및 타임라인 공격에 대한 강인성 및 비가시성을 가짐을 확인하였다.

• 한국정보과학회논문지:정보통신
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• 제36권6호
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• pp.536-544
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• 2009

본 연구에서는 벡터 데이터의 저작권 보호를 위한 디지털 워터마킹 기법을 제안하였다. 제안한 방법은 벡터 데이터를 구성하고 있는 포인트들의 최단 거리를 구하고 그 거리를 이용하여 워터마크를 삽입하도록 하였다. 워터마크를 삽입한 실험 데이터에 다양한 공격을 한 후 워터마킹 방법의 강인성을 테스트하였다. 실험 결과 제안한 방법은 기존 방법보다 강인함을 나타내었다. 그리고 워터마크를 삽입한 후에도 위상이 변하지 않아 제안한 방법은 GIS환경에서의 벡터 데이터를 고려한 방법이 될 수 있음을 알 수 있었다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2006년도 춘계종합학술대회
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• pp.201-204
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• 2006

본 논문은 실시간 DVR 시스템에서 다양한 공격에 강인한 비디오 워터 마킹 알고리즘을 적용한 시스템 구현에 관한 것이다. DVR 시스템에서 영상 및 알고리즘을 실시간으로 처리하기 위해 DSP 프로세서를 사용하여 강인한 비디오 워터마킹 알고리즘을 실시간 DVR 시스템에 적합한 형태로 적용하였다. 실험 결과, D1크기의 영상에서 한 프레임 당 처리 시간이 약 2.5ms 소요되었다.

• 대한전자공학회논문지TE
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• 제37권2호
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• pp.25-32
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• 2000

디지털 워터마킹은 멀티미디어 데이터의 저작권 보호 목적으로 최근에 제안되었다. 본 논문에서는 디지털 영상에 저작권 정보를 은닉하는 새로운 방법을 제안한다. 제안한 방법은 2차원 이산 웨이브릿 변환과 영상의 통계적 특성에 기반한다. 가우시안이나 라플라시안 워터마크를 웨이브릿 영역에서 중간이나 고주파 대역의 큰 계수에 삽입한 결과 라플라시안 워터마크는 잡음, JPEG 압축, 가우시안 블러링 그리고 에지 강조와 같은 일반적인 영상 왜곡에 매우 강함이 입증되었다.