• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.10a
• /
• pp.757-758
• /
• 2015

The digital watermark is one of important techniques to solve copyright authentication problems of digital media. Researches on the digital watermark are rapidly increasing in various media. The watermark system can resist some attacks such as signal attack, geometric attack and protocol attach. However, so far the robustness of the watermark needs to be improved. This paper suggests a watermarking technique with which a watermark is embedded on a coefficient of wavelet-based frequency band and extracted from it for protection of property rights and authentication of Blackfin processor-based digital sound. By carrying out hardware implementation of the suggested sound watermarking, the commercialization of protection of property rights and robustness of watermarks resulted from development of high-level programs can be confirmed.

• Journal of Digital Contents Society
• /
• v.12 no.3
• /
• pp.329-337
• /
• 2011

Digital talking book has been developed to enhance reading experiences for reading-disabled people. In the existing digital talking book, however, annotations can be created only through the screen interfaces. Screen annotation interfaces is of no use for reading-disabled people because they need reader's eyesight. In this paper, we suggest a voice annotation technique can create notes and highlights at any playing time by using hearing sense and voice command. We design a location determination technique that pinpoints where a voice annotation should be placed in the playing sentences. To verify the effectiveness of our voice annotation technique, we implement a prototype in an android platform. We can find out by the black-blindfolded users testing that our system can perfectly locate the exact position that a voice annotation should be placed into.

• The Optical Journal
• /
• s.86
• /
• pp.26-28
• /
• 2003

`디지털`자체가 화두가 되어버린 지금 업계에 불어 닥치고 있는 개별 마케팅의 바람을 타고 디지털 프린팅에 대한 관심이 부쩍 높아졌다. 개별 마케팅이란 고객에 대한 개별적인 정보관리를 통하여 그 고객에게 가장 적합한 마케팅을 실현하는 기법으로서 이를 위해서는 브로슈어나 프로모션용 출력물 제작시 고객의 요구에 적합한 맞춤형 정보 및 서비스가 제공되어야 하며, 이 경우 소량 다품종 출력이 가능한 `1:1 디지털 프린팅`의 활용이 필수적이다. 따라서 대부분의

• Journal of Korea Multimedia Society
• /
• v.15 no.1
• /
• pp.1-8
• /
• 2012

In this paper, we propose the digital video frame obfuscation method for intellectual property protection using the DC component of the intra frame and the motion vector of the inter frame at digital video encoding. The proposed method considers characteristics of the HVS (human visual system) which is sensitive at the low frequency and the middle frequency. This method makes the signal distorted as operating XOR between authentication signal and the DC coefficient of the intra frame including main information and the sign of the motion vector including edge motion, so that the video is normally displayed only when suitable authentication signal is applied.

• The KIPS Transactions:PartB
• /
• v.10B no.4
• /
• pp.367-372
• /
• 2003

The existing watermarking techniques for copyright protection of a digital image are fragile in geometric distortion and it is hard to detect whether it was manipulated artificially. In this paper, we proposed the new copyright protection system that can authorize a digital mage and :an embed or extract a robust watermark in a artificial manipulation in order to solve these problems. In a watermarking part, the proposed a watermarking technique embeds a watermark in a phase component after a Complex Wavelet Transform (CWT) with an original image, and a watermark is extracted from an watermarked image by stages. A copyright about an image can be insisted on than a threshold after comparing a correlation of an original watermark with an extracted watermark if large. In an authentication part of a digital image, EZW (Embedded Zerotree Wavelet) is used, and an authentication cord of an watermarked image is generated. An authentication code of an image to have been distribute to is compared with a generated authentication cord, and artificial operation isn´t than a threshold if large. The proposed copyright protection system through performance evaluation display that it was robust in geometric distortion and a artificial operation was able to be detected.

• The KIPS Transactions:PartC
• /
• v.9C no.1
• /
• pp.1-8
• /
• 2002

Digital image watermarking is a technique for the purpose of protecting the ownership of the image by embedding proprietary watermarks in a digital image. It is required for the digital image watermarking scheme to pursue the robustness against water marking attacks and the perceptual Invisibility more than usual in steganography area, to guarantee not a hidden watermarking algorithm but the publicity of water-marking algorithm details and hidden use of key, which can protect the unauthorized user access from detection. In this paper we propose a new copyright watermarking scheme, which is barred on one-way hash functions using ElGamal functions and modular operations. ElGamal functions are widely used in cryptographic systems. Our watermarking scheme is robust against LSB(least significant bit) attacks and gamma correction attack, and also perceptually invisible. We demonstrate the characteristics of our proposed watermarking scheme through experiments. It is necessary to proceed as the future work the algorithm of achieving at the same time both the pseudo-randomness for the steno-key generation and the asymmetric-key generation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2001.10a
• /
• pp.261-264
• /
• 2001

최근 디지털 기술의 발전으로 인해 여러 디지털 컨텐츠들의 불법복제가 확산되고 있다. 따라서 저작권 보호와 불법복제를 막기 위한 다양한 기술들이 연구되고 있다. 그 중 디지털 워터마킹 기법은 디지털 컨텐츠 내부에 사용자가 원하는 정보를 보이거나 들리지 않게 숨기는 것을 말하며, 이때 삽입되는 정보를 워터마크(Watermark)라 한다. 디지털 워터마크를 삽입하는 방법으로는 크게 PN시퀀스를 삽입하는 방법, 위상을 변화시키는 방법, 반향신호를 삽입하는 방법이 있다. 이러한 워터마크는 다양한 공격에서도 검출할 수 있어야 한다. 본 논문은 미국음반산업협회(RIAA)에서 제안한 SDMI(Secure Digital Music Initiative) Phase II Screening 중 다운 믹싱에 강인한 워터마킹 방법에 대해서 연구하였으며, 시뮬레이션과 청취 실험을 통하여 성능을 검증하였다.

• The Journal of the Korea Contents Association
• /
• v.7 no.2
• /
• pp.180-190
• /
• 2007

Recently investigation institutions have found the clue leading to solution of the problem by digital evidence. Digital medium is used extensively in real life. Accordingly, offender is leaving from traces of crime to digital form. But, Korea's digital evidence investigation is low level yet. Definite legislation about digital evidence is not readied in present our country. And professional investigation manpower about digital evidence is insufficient. These problem may have to be supplemented urgently. Systematic, technological supporting is required. Specialize and discussed digital evidence investigation's controversial point and capacity reinforcement way for efficient confrontation in cyber crime who is diversified gradually in text.

• CDE review
• /
• v.21 no.1
• /
• pp.7-12
• /
• 2015

본 글을 통해 학생들과 함께 수행한 다양한 디지털 디자인 모델을 기반으로 5가지의 디지털 패브리케이션 방식을 적용하여 여러 실제 인테리어패널의 제작 과정 및 그 결과물들을 요약적으로 소개하였다. 해당 과정은 기존의 분리된 설계와 제작 및 시공이 아닌, 설계-제작 통합적인 접근방법을 활용함으로써 학생들로 하여금 디지털 디자인과 패브리케이션의 효과를 극대화 할 수 있음을 체득하도록 하였다. 패브리케이션 기기 및 재료 등의 차이점에 따라 실제 구현된 모델과 원래의 디지털 모델과의 형상적인 차이점은 아직까지 한계점으로 남을 수 있지만, 비정형적으로 생성된 디지털 디자인의 형상이 직접적으로 실현이 가능하다는 점에서 의의가 있다고 할 수 있다. 또한 패러매트릭 모델링 기법이나 실제 제작 경험이 거의 없는 학생들을 대상으로 개별적인 교육이 아닌 설계-제작 통합적인 교육을 실시함으로써 각 요소들이 어떻게 유기적으로 관련되어 디지털 디자인 과정이나 패브리케이션과정에서 상호 보완적으로 중요한지 직접 체득할 수 있도록 하였다는데 의의가 있다. 본 글에서 소개한 재료를 깎는 등의 방식인 "마이너스"의 방식이 아닌 3D프린팅과 같이 재료를 이용해 만들어가는 "플러스"적인 방식 또한 해당 사례에서 수행되었으며 마찬가지로 다양한 특성을 지니고 있으나, 본 글에서는 전자의 방식에 대해 주로 논하였다. 본 글에서 다룬 제작기법뿐만 아니라 3D프린팅 기술의 발전과 보급에 따라 디지털 패브리케이션 역시 다양하게 진보하고 있으며, 팹랩 등을 통한 학교에서의 건축설계 교육도 다양하게 진화하고 있다. 본 사례 및 기타 실험적인 교육과 선도적인 여러 시도를 통해서, 디지털 디자인과 패브리케이션 영역을 확장시켜나가고 해당 기술의 발전에 적극적으로 보조할 수 있는 교육과정을 수립하고 이행하는데 일조 할 수 있기를 희망한다.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.8 no.2
• /
• pp.41-45
• /
• 1994

In this paper, it is implemented that Sub- MRA PWM techinque which is applied to MRA PWM technique using the Digital Signal Processor. Unstable element of analog is reduced for Sub - MRA PWM technique by digital signal pressing. And harmonic is analized by simulation to verify that. It is afford the process induction motor control with real time by minimizing the delay time of digital system. Time delay which is a defect of digital control can by minimized using fast caculation. Therefore, real time control is implemented in the induction motor