• 한국정보통신학회논문지
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• 제7권3호
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• pp.532-543
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• 2003

본 논문은 저작권보호를 위해 디지털영상의 라벨링을 위한 reversible DTCNN(discrete-time cellular neural network) 구조를 제안한다. 이러한 저작권보호 라벨링을 위해서 2차원 이진 pseudo 랜덤 영상열에 사용할 수 있는 새로운 reversible DTCNN의 구조와 개념을 설명하고 이에 대한 복잡행위를 보여주기 위해 reversible DTCNN의 서로 다른 방법들의 예시를 들어 설명한다. 또한 서로 다른 2진영상인 원영상과 복사된 영상은 서로 다른 2진 랜덤 영상키를 사용한다. 이 영상키는 원영상을 스크램블하는데 사용된다. 따라서 reversible DTCNN를 다시 역변환시켜서 저작권보호가 라벨링된 영상으로부터 복사된 영상임을 찾아낼 수 있다. 그러나 이러한 동영상을 처리하는 데는 S/W에서는 많은 시간이 소요되므로 고속 DTCNN 칩을 사용하여 실시간에서 동영상이나 비디오영상을 저작권보호를 위한 라벨링에 사용할 수 있으며, 이러한 결과를 컴퓨터에서 시뮬레이션됨을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권4호
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• pp.856-873
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• 2011

Reversible watermarking is an open problem in information hiding field, with embedding the encoded bit '1' or '0' into some sensitive images, such as the law enforcement, medical records and military images. The technique can retrieve the original image without distortion, after the embedded message has been extracted. Histogram-based scheme is a remarkable breakthrough in reversible watermarking schemes, in terms of high embedding capacity and low distortion. This scheme is lack of capacity control due to the requirement for embedding large-scale data, because the largest hidden capacity is decided by the amount of pixels with the peak point. In this paper, we propose a reversible watermarking scheme to enlarge the number of pixels with the peak point as large as possible. This algorithm is based on an adaptive edge-guided interpolation, furthermore, hides messages by interpolation-error, i.e. the difference between the original and interpolated image value. Simulation results compared with other state-of-the-art reversible watermarking schemes in this paper demonstrate the validity of the proposed algorithm.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권12호
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• pp.3100-3116
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• 2012

Reversible data hiding enables the embedding of messages in a host image without any loss of host content, which is proposed for image authentication that if the watermarked image is deemed authentic, we can revert it to the exact copy of the original image before the embedding occurred. In this paper, we present an improved histogram-based reversible data hiding scheme based on prediction and sorting. A rhombus prediction is employed to explore the prediction for histogram-based embedding. Sorting the prediction has a good influence on increasing the embedding capacity. Characteristics of the pixel difference are used to achieve large hiding capacity while keeping low distortion. The proposed scheme exploits a two-stage embedding strategy to solve the problem about communicating peak points. We also present a histogram shifting technique to prevent overflow and underflow. Performance comparisons with other existing reversible data hiding schemes are provided to demonstrate the superiority of the proposed scheme.

• 전자공학회논문지SC
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• 제47권1호
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• pp.29-34
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• 2010

본 논문에서는 새로운 패리티 보존형 가역 논리게이트를 제안한다. 패리티 보존형 가역 논리게이트는 입력 값과 출력 값의 패리티가 같은 가역 논리게이트를 의미한다. 최근 가역 논리 게이트가 저전력 CMOS 디자인, 양자 컴퓨팅 그리고 나노 테크놀로지와 같은 분야에서 전력을 효율적으로 사용하는 방법임을 알려졌다. 그리고 패리티 체크(parity-checking)는 디지털 시스템에서 오류 주입을 확인 하는 대표적인 방법 중 하나이다. 제안하는 새로운 패리티 보존형 가역 논리게이트는 모든 boolean 함수를 구성할 수 있고, 기존의 오류 확인 boolean 함수보다 가역 논리게이트 수, garbage-output의 수 그리고 하드웨어 연산량에서 효율적으로 구성할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권12호
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• pp.4024-4041
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• 2022

Robust reversible watermarking has attracted widespread attention in the field of information hiding in recent years. It should not only have robustness against attacks in transmission but also meet the reversibility of distortion-free transmission. According to our best knowledge, the most recent robust reversible watermarking methods adopt a single image as the carrier, which might lead to low efficiency in terms of carrier utilization. To address the issue, a novel dual-image robust reversible watermarking framework is proposed in this paper to effectively utilize the correlation between both carriers (namely dual images) and thus improve the efficiency of carrier utilization. In the dual-image robust reversible watermarking framework, a two-layer robust watermarking mechanism is designed to further improve the algorithm performances, i.e., embedding capacity and robustness. In addition, an optimization model is built to determine the parameters. Finally, the proposed framework is applied in different domains (namely domain-independent), i.e., Slantlet Transform and Singular Value Decomposition domain, and Zernike moments, respectively to demonstrate its effectiveness and generality. Experimental results demonstrate the superiority of the proposed dual-image robust reversible watermarking framework.

• 방송공학회논문지
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• 제12권2호
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• pp.112-119
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• 2007

Reversible data embedding theory has marked a new epoch for data hiding and information security. Being reversible, the original data and the embedded data as well should be completely restored. Difference expansion transform is a remarkable breakthrough in reversible data hiding scheme. The difference expansion method achieves high embedding capacity and keeps the distortion low. This paper shows that the difference expansion method with simplified location map, and new expandability and changeability can achieve more embedding capacity while keeping the distortion almost the same as the original expansion method.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제6권8호
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• pp.1964-1981
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• 2012

In this paper a reversible data hiding scheme based on histogram shifting of host image blocks is presented. This method attempts to use full available capacity for data embedding by dividing the image into non-overlapping blocks. Applying histogram shifting to each block requires that extra information to be saved as overhead data for each block. This extra information (overhead or bookkeeping information) is used in order to extract payload and recover the block to its original state. A method to eliminate the need for this extra information is also introduced. This method uses maximum gap that exists between histogram bins for finding the value of pixels that was used for embedding in sender side. Experimental results show that the proposed method provides higher embedding capacity than the original reversible data hiding based on histogram shifting method and its improved versions in the current literature while it maintains the quality of marked image at an acceptable level.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권4호
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• pp.655-670
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• 2010

To be reversible as a data hiding method, the original content and hidden message should be completely recovered. One important objective of this approach is to achieve high embedding capacity and low distortion. Using predicted errors is very effective for increasing the embedding capacity. Sorting the predicted errors has a good influence on decreasing distortion. In this paper, we present an improved reversible data hiding scheme using upgraded histogram shifting based on sorting the predicted errors. This new scheme is characterized by the algorithm which is able to find the optimum threshold values and manage the location map effectively. Experimental results compared with other methods are presented to demonstrate the superiority of the proposed method.

• 한국컴퓨터정보학회논문지
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• 제17권11호
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• pp.19-26
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• 2012

교차로에서 가변차선은 이동하는 차량들을 효율적으로 통제하고 교통 혼잡을 줄일 수 있으며 도로의 가용 능력을 증가시키기 위한 도구로 사용되고 있다. 그러나 아직까지 가변차선의 교통통제는 단순하며 수동으로 가변차로를 운용하고 있다. 따라서, 본 연구에서는 가변차로의 이동방향에 대한 변경 여부를 지능적으로 판단하여 교통 흐름을 효율적으로 개선하기 위한 3단계 방법을 제안한다. 첫 번째는 교차로에서 차량이 이동하는 방향으로 효율성을 판단하기 위한 방법으로 퍼지추론 방법, 두 번째는 이동방향으로 가변차로를 변경할 지에 대한 잠정 판단, 세 번째는 이러한 잠정판단을 최종결정하기 위한 판단기준을 제시한다. 이동방향으로의 효율성은 matlab 프로그램을 이용하여 얻는다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.986-989
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• 2011

Reversible data hiding is a technique that can embed information into cover media (image, video, voice signal) and can recover the original cover media after extracting the embedded information. In this papa, we propose a new reversible data hiding methods that based on block median preservation and the image local characteristic. By using the median value of a block, a high payload can be got and by considering the image local characteristic, a lot of distortion can be avoided and a high PSNR can be got. In the experiment, our methods can generate better result than the previous reversible data hiding methods.