• Journal of the Korea Society of Computer and Information
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• v.16 no.10
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• pp.175-183
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• 2011

Performance of digital video watermarking is an assessment that hides a lot of information in digital videos. Therefore, it is required to find a way that enables to store lots of bits of data into a high quality video of the frequency area of digital contents. Hence, this paper designs a watermarking system improving security with an enhancing watermarking based on invisible watermarking and embedding an watermarking on LH and HL subband and its subband by transforming wavelet after the extraction of luminance component from the frames of video by compromising robustness and invisible of watermarking elements. The performance analysis of security of watermarking is carried out with a statistic method, and makes an assessment of robustness against variety of attacks to invisible watermarking. We can verify the security of watermarking against variety of attacks by testing robustness and invisible through carrying out general signal processing like noise addition, lossy compression, and Low-Pass filtering.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.6
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• pp.503-510
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• 2020

In this paper, we proposed an effective technique that greatly improves the security of the watermark by concealing the multiple-encrypted watermark in the LSB of the image pixel. Even if multiple encrypted watermark hidden in the LSBs of an image pixel are extracted, it is impossible to decrypt them, so the security of the watermark is maintained very high. If the watermark is multiple encrypted and hidden in the image using the proposed technique, the visual quality of the watermark-hidden image is very high, making it impossible to distinguish between the original image and the resulting image in which the watermark is hidden. The original watermark data can be completely extracted without loss, according to the procedure of the proposed technique, from the resulting image that the watermark is encrypted and hidden in the original image. The performance of the proposed technique was analyzed mathematically and the superiority of the proposed technique was confirmed through experiments. The proposed technique is an excellent image watermarking technique that greatly improves the security of the watermark hidden in the image compared to the existing technique.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.863-867
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• 2021

In this paper, in order to hide the watermark in the LSB of the color image, a color image watermarking technique with high security is proposed by using the adjacent pixels of the image and the spatial encryption technique. According to the technique proposed in this paper, the quality of the stego-image generated by hiding the watermark in the LSB of the color image is so excellent that the difference from the original image cannot be recognized, and the original watermark can be extracted from the stego-image without loss. If the watermark is hidden in the image using the proposed technique, the security of the watermark is maintained very high because the watermark hidden in the stego-image is multi-encrypted. The proposed watermarking technique can be used in applications such as military and intellectual property protection that require high security.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.4
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• pp.630-637
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• 2003

This paper proposed a new watermarking algorithm using chaotic sequence instead of conventional M-sequence for protecting copyright to the author. Robustness and security is very important for watermarking process. We use multi-threshold value according to the human visual system for improving robustness of watermarking to each subband images coefficient differently after wavelet transform. And then, we embedded watermark image to original image by multi-watermark weights which are made by random sequence generator. We detect watermark image from the difference data which is made from each wavelet subband images. We also simulate the efficiency from the various possible attacks. Chaotic sequence is better than M-sequence, because the one is very easy to make sequence and the chaotic sequence is changed easy according to the initial value. So, the chaotic sequence has the better security than the conventional M-sequence.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9C
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• pp.1289-1297
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• 2004

Digital watermarking is a technique which blends intellectual property right with security Blind watermarking 1S one of the difficult watermark technique because original data or inserted watermark is not needed. In this paper, we propose a new blind watermarking method using energy quantization in wavelet domain to insert watermark. The proposed method is robust for various attacks and attack strength because watermark strength is adaptively changed for energy variation of attacks. Simulation results show the proposed method is robust to various attacks such as noise addition, cropping, blurring, sharpening, maintaining imprescriptibility.

• The Journal of the Convergence on Culture Technology
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• v.6 no.1
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• pp.485-488
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• 2020

In this paper, a technique for securely concealing the watermark, which is intellectual property information, in the image pixel LSB using spatial encryption is proposed. The proposed watermarking technique can be effectively used to protect intellectual property of images. The proposed technique can be used to extract watermark without loss from the stego-image, which is a hidden image of spatially encrypted watermark. The experimental results confirmed the superiority of the proposed technique. As a result of performing watermarking using the proposed technique, the image quality of the stego-image is higher than 51 dB, so humans cannot visually recognize the presence of a watermark. Due to the watermark is spatially encrypted, the security of the watermark is excellent.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.345-346
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• 2024

디지털 기술과 정보통신 기술이 발전하면서 디지털 콘텐츠의 불법복제 및 유통으로 인한 저작권 침해 피해가 증가하고 있다. 저작권 침해 문제를 예방하기 위해 다양한 디지털 워터마킹 기술이 제안되었지만, 디지털 이미지 워터마킹은 이미지에 기하학적 변형을 가하면 삽입된 워터마크가 훼손되어 탐지가 어렵다는 문제가 있다. 본 연구에서는 왜곡 공격에 강인한 상관관계 측정 기반 워터마킹 기법을 제안한다. 제안한 방식은 교차 상관 기법을 이용해 이미지와 워터마크의 상관관계를 계산하고 임계값과 비교하여 공간 영역에서의 비가시성 워터마크의 존재 여부를 검증할 수 있는 디지털 워터마킹 방법이다. 실험 결과에 따르면 표준편차 120의 가우시안 노이즈 공격을 가해도 원본 워터마크와 0.1 이상의 상관관계를 보이며, 종래의 방식보다 높은 탐지 성능을 나타냈다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.11a
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• pp.176-179
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• 2015

본 논문에서는 3D 디지털 영상 컨텐츠의 저작권 보호를 위해 DWT(Discrete Wavelet Transform)를 이용하여 강인성(robustness), 비가시성(invisibility), 보안성(security)을 만족하는 블라인드(Blind) 워터마킹 방법을 제안한다. 이 방법은 깊이 영상 기반 랜더링(DIBR, Depth Image Based Rendering)에 효과적으로 대처하기위해 고안된 알고리즘으로, 랜더링시 발생하는 왜곡에 영향이 적은 1-Level DWT LH 부대역에 워터마크를 삽입하는 방법이다. 이 방법에서 저작권에 대한 판단은 추출한 워터마크 정보를 통합 판단하는 방법을 사용한다. 이 방법은 저작권 보호를 위해 원본 영상을 보관할 필요가 없으며, 깊이 영상 기반 랜더링 baseline distance 5% 공격에 좌,우시점 영상 모두 효율적으로 적은 에러율을 보이며 워터마크로서 충분한 강인성을 보여준다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.69-72
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• 2015

본 논문에서는 디지털 영상 컨텐츠의 저작권 보호를 위해 DWT 를 이용하여 강인성(robustness), 비가시성(invisibility), 보안성(security)을 만족하는 blind 워터마킹 방법을 제안한다. 이 방법은 영상정보에 대한 변화를 원본 영상의 특정 부분에 국한하지 않게 하기 위해서, 특정 주파수 성분에 워터마크를 삽입하는 것이 아닌 전체 영상에 워터마크를 삽입하는 방법이다. 이 방법에서 저작권에 대한 판단은 추출한 워터마크 정보를 통합 판단하는 방법을 사용한다. 이 방법은 저작권 보호를 위해 원본 영상을 보관할 필요가 없으며, Gaussian filtering, average filtering, sharpening 의 영상 필터링, JPEG 손실 영상 압축, resizing, 영상 품질 향상을 위한 Contrast 나 histogram equalization 등의 공격에 충분한 강인성을 보여준다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.13 no.3
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• pp.262-266
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• 2020

In this paper, we proposed an effective technique for hiding the watermark in the LSB of a color image by applying spatial encryption techniques. Even if the watermark hidden in the LSB of the image is extracted, the information of the extracted watermark cannot be decrypted because the watermark is encrypted using various spatial encryption techniques. Therefore, if the watermark is concealed in the LSB using the spatial encryption techniques proposed in this paper, the security is greatly improved compared to the existing technique of embedding the watermark in the LSB. When watermarking is performed by applying the proposed technique, the image quality of the watermark-concealed image is very good, so it is impossible to distinguish it from the original image, and the watermark, which is confidential data, can be extracted from the watermarked image without loss. The performance of the proposed technique was mathematically analyzed and the superiority of the proposed technique was confirmed through experiments. When the watermark was concealed by applying the proposed technique to Lenna, airplane, Tiffany, and pepper images having a size of 512×512, the PSNR values of the watermarked images were 53.91dB, 54.10dB, 54.09dB, and 54.13dB, respectively.