• Title/Summary/Keyword: watermark

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Identifying Friendly and Foe Using a Watermarking Technique During Military Communication (군 통신상에서 워터마킹 기술을 이용한 피아식별 방법)

  • Lee, Jong-Kwan;Choi, Hyun-Joo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.9 no.4
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    • pp.81-89
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    • 2006
  • In this paper, a watermark technique for identifying friendly and foe is proposed during communication. The speech signal is processed in several stages. First, speech signal is partitioned into small time frames and the frames are transformed into frequency domain using DFT(Discrete Frequency Transform). The DFT coefficients are quantized and the watermark signal is embedded into the quantized DFT coefficients. At the destination channel quantization errors of received signal are regarded as the watermark signal. Identification of friendly and foe are done by correlating the detected watermark and the original watermark. As in most other watermark techniques, this method has a trade off between noise robustness and quality. However, this is solved by a partial quantization and a noise level dependent quantization step. Simulation results in the various noisy environments show that the proposed method is reliable for identification between friendly and foe.

Low-Complexity Watermarking into SAO Offsets for HEVC Videos

  • Wu, Xiangjian;Jo, Hyun-Ho;Sim, Donggyu
    • IEIE Transactions on Smart Processing and Computing
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    • v.5 no.4
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    • pp.243-249
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    • 2016
  • This paper proposes a new watermarking algorithm to embed watermarks in thr process of sample adaptive offsets (SAO) for high efficiency video coding (HEVC) compressed videos. The proposed method embeds two-bit watermark into the SAO offsets for each coding tree unit (CTU). To minimize visual quality degradation caused by embedding watermark, watermark bits are embedded into SAO offset depending on the SAO types of block. Furthermore, the embedded watermark can be extracted by simply adding four offsets and checking their least significant bits (LSB) at the decoder side. The experimental results show that the proposed method achieves 0.3% BD-rate increase without much visual quality degradation. Two-bit watermark for each CTU is embedded for more bit watermarking. In addition, the proposed method requires negligible computational load for watermark insertion and extraction.

Watermarking of Compressed Video in the Bitstream Domain: An Efficient Algorithm and its Implementation

  • Drobouchevitvh Inna G.;Lim Sung-Jun;Han Byung-Wan;Chang Hang-Bae;Kim Kyung-Kyu
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.31 no.4C
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    • pp.458-471
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    • 2006
  • Digital watermarking of multimedia data is a very active research area that has enjoyed a considerable amount of attention in recent years. In this paper, we propose an algorithm for embedding/detecting a fragile watermark in MPEG-4 compressed video domain (Simple and Advance Simple Profiles). The watermark bits are put directly into Huffman VLC-codespace of quantized DCT domain. The advantage of watermark embedding into the compressed domain is the significant savings for a real-time implementation as it does not require a full decoding operation. The watermark embedding does not change the video file size. The algorithm demonstrates high watermarking capacity, thereby providing reliable foolproof authentication. The results of experimental testing demonstrate that watermark embedding preserves the video quality. Watermark detection is performed without using the original video.

Color Image Digital Watermarking Using Block Information (블록 정보를 이용한 칼라 정지영상 워터마킹)

  • 김희수;이호영;이호근;하영호
    • Proceedings of the IEEK Conference
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    • pp.81-84
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    • 2001
  • In this paper, we proposed a digital watermarking for color still image using the characteristics of human visual system and the achromatic block information. We use a binary watermark signal and insert watermark signal in the chromatic component region of YCrCb color space. In order to extract the watermark signal, we extracted the watermark signal by presuming that modified pattern of chromatic saturation without using original an image. Experimental results show that the proposed watermarking method has a good performance to embed watermark signal and extract one.

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A fast watermark embedding method for MPEG-2 bit stream (MPEG-2 비트 스트림에 대한 고속 워터마크 삽입방법)

  • 김성일;서정일;김구영;원치선
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • pp.151-154
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    • 1997
  • In this paper, we propose a new watermarking algorithm for copyright protection of video data. The proposed algorithm inserts a watermark directly on the MPEG-2 bitstream. Since more and more video data are stored and transmitted in a compressed form, it is desirable to insert a watermark on the compressed bit stream to avoid the expensive full-decoding and re-encoding process. Embedding a watermark in the compressed domain, we can also avoid the effect of the compression error which may erase the watermark.

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Image Watermarking using holographic watermark (홀로그래픽 watermark를 이용한 영상 watermarking)

  • 김규태;김수길;고명숙;김종원;최종욱
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.175-179
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    • 2003
  • We propose a new watermarking scheme that can be used to embed multiple bits and also resilient to JPEG compression and geometrical transforms such as scaling, rotation, and cropping based on holographic watermark that allows multiple watermark recovery without original content(cover image).

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A Study on the Selection of the Optimal Insertion Region for Digital Watermarking in the Frequency Domain (주파수 영역에서의 최적 워터마크 삽입영역 선정에 대한 연구)

  • 오재호;조시용;김선형
    • Journal of the Institute of Convergence Signal Processing
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    • v.3 no.3
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    • pp.36-40
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    • 2002
  • In this paper, we proposed a digital watermarking method based on the edge-wavelet transform to protect digital contents copyrights. We find out the optimal watermark insertion region and the proper amount of watermark in order to satisfy robustness and imperceptibility against various attacks such as noise, compression, collusion, clipping, scaling. Especially through this experiment, we could find out the adequate location of watermark insertion and proper amount of watermark and it is also viewed to satisfy robustness and imperceptibility in the lower frequency region with small watermark quantity.

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VR Image Watermarking Method Considering Production Environments (제작 환경을 고려한 VR 영상의 워터마킹 방법)

  • Moon, Won-jun;Seo, Young-ho;Kim, Dong-wook
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.561-563
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    • 2019
  • This paper proposes a watermarking method for copyright protection of images used in VR. The Embedding method is that finds the point through the SIFT feature points, inserts the watermark by using DWT and QIM on the surrounding area. The objective image to extract the embedded watermark is the projected image and its method finds the SIFT feature points and extracts watermark data from its surrounding areas after correction by using inverse process of matching and projection in the VR image production process. By comparing the NCC and BER between the extracted watermark and the inserted watermark, the watermark is determined by accumulating the watermark having a threshold value or more. This is confirmed by comparing with a conventional method.

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An Improved Method of Digital Watermarking Applied to Binary Printed Images (이진 프린트 영상에 적용하는 디지털 워터마킹의 성능 개선)

  • 김현주;곽내정;권혁봉;안재형
    • Journal of Korea Multimedia Society
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    • v.4 no.3
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    • pp.247-256
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    • 2001
  • Digital watermarking is a copyright protection technique for digital images which embed a code into the digital data so the data is marked. Watermarking techniques previously deal with on-line digital data and have been developed to withstand digital attacks such image processing, compression and geometric transformation. In this paper we propose a novel method of embedding watermarks in printed images. In the proposed algorithm, watermark is embedded in a dithered binary image by comparing the $2\times{2}$ blocks of the counting array is the number of 1 (WHITE) in the $16\times{16}$ blocks of the dithered binary image with predefined reference block pattern, which is generated by watermark values. The proposed algorithm is able to provide more information at a watermark because the proposed algorithm use both '1'and '0' as watermark values. The watermark information is detected by comparing the watermark which is reconstructed from the image which is embedded watermark with the original watermark which is embedded in a binary image. The performance of the proposed algorithm is compared with that of the conventional watermark embedding algorithm for printed images by detecting watermark for scan images.

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An Advanced Color Watermarking Technique using Various Spatial Encryption Techniques (다양한 공간적 암호화 기법을 적용한 개선된 컬러 영상 워터마킹 기법)

  • Jung, Soo-Mok
    • 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.