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检索条件"主题词=transform coding"

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DCT-domain watermark detector using a normal inverse Gaussian prior

DCT-domain watermark detector using a normal inverse Gaussia...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： M. I. H. Bhuiyan R. Rahman Department of Electrical and Electronic Engineering Bangladesh University of Engineering and Technology Dhaka Bangladesh

In this paper, a blind statistical method for watermark detection is developed using a symmetrical normal inverse Gaussian (SNIG) prior for modelling the block-DCT coefficients of images. The proposed detector is motivated by the superior ability of the SNIG prior in capturing the statistics of the DCT coefficients as compared to the conventionally used priors. Analytical expressions are derived for the Bayesian log-likelihood ratio and the corresponding mean and variance under null and alternative hypotheses. Extensive experiments are carried out using standard images to study the performance of the proposed detector and the results show that it performs better than several existing detectors in terms of the associated probabilities of false alarm and detection for watermarks of varying strength.

关键词： Watermarking Discrete cosine transforms Detectors transform coding Image processing Solids

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A Novel Reversible Semi-Fragile Watermarking Algorithm of MPEG-4 Video for Content Authentication

A Novel Reversible Semi-Fragile Watermarking Algorithm of MP...

引用

International Symposium on Intelligent Information Technology Application, IITA

作者： Hui Chen Zhenyong Chen Xiao Zeng Wei Fan Zhang Xiong School of Computer Science and Engineering Beihang University Beijing China

This paper proposes an invertible semi-fragile video watermarking algorithm using a hash function to authenticate the MPEG-4 video contents. The proposed algorithm embeds two watermarks into I frame while encoding YUV video to MPEG-4 format. One watermark using hash function aims to authenticate the contents and embed the frame number for manipulation location between frames, and the other one based on DC coefficients is used for the detection of manipulation location within the frame. The experimental results show that the proposed algorithm is able to authenticate the video contents and detect the manipulation location, and it is robust for MPEG-4 compression. In addition, the proposed algorithm is exactly invertible, which means that the original video data is available as long as the watermarked video is credible.

关键词： Watermarking MPEG 4 Standard Authentication Video compression transform coding Robustness Discrete cosine transforms Digital images Information technology Application software

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Digital image forgery detection on artificially blurred images

Digital image forgery detection on artificially blurred imag...

引用

International Conference on Emerging Trends in Communication, Control, Signal Processing & Computing Applications (C2SPCA)

作者： Hrudya P Lekha S. Nair Adithya S.M Reshma Unni Vishnu Priya H Prabaharan Poornachandran Amrita Center for Cyber Security Amrita Vishwa Vidyapeetham Kollam Kerala India

In this digital era, lot of information are expressed through images. Various social networking websites, such as Facebook, Twitter, MySpace etc. provides a platform for the users to post up almost any type of picture or photo. However, with the advancement in image editing technologies, many users have become victims of digital forgery as their uploaded images were forged for malicious activities. We have come up with a system which detects image forgery based on edge width analysis and center of gravity concepts. An algorithm based on edge detection is also used to identify the fuzzy edges in the forged digital image. The forged object in the image is highlighted by applying Flood fill algorithm. Different types of image forgeries like Image splicing, Copy-Move image forgery etc. can be detected. This method also reveals multiple forgeries in the same image. The proposed system is capable of detecting digital image forgeries in various image formats efficiently. The results we obtained after the analysis of different images shows that the proposed system is 95% efficient.

关键词： Forgery Image edge detection Digital images Image coding transform coding Gravity Splicing

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Parallelization and characterization of SIFT on multi-core systems

Parallelization and characterization of SIFT on multi-core s...

引用

IEEE International Workshop/Symposium on Workload Characterization

作者： Hao Feng Eric Li Yurong Chen Yimin Zhang Application Research Laboratory Intel China Research Center Limited China

This paper parallelizes and characterizes an important computer vision application -Scale Invariant Feature transform (SIFT) both on a Symmetric Multiprocessor (SMP) platform and a large scale Chip Multiprocessor (CMP) simulator. SIFT is an approach for extracting distinctive invariant features from images and has been widely applied. In many computer vision problems, a real-time or even super-real-time processing capability of SIFT is required. To meet the computation demand, we optimize and parallelize SIFT to accelerate its execution on multi-core systems. Our study shows that SIFT can achieve a 9.7x ~ llx speedup on a 16 -core SMP system. Furthermore, Single Instruction Multiple Data (SIMD) and cache-conscious optimization bring another 85% performance gain at most. But it is still three times slower than the real-time requirement for High-Definition Television (HDTV) image. Then we study the performance of SIFT on a 64 -core CMP simulator. The results show that for HDTV image, SIFT can achieve an excellent speedup of 52 x and run in real-time finally. Besides the parallelization and optimization work, we also conduct a detailed performance analysis for SIFT on those two platforms. We find that load imbalance significantly limits the scalability and SIFT suffers from intensive burst memory bandwidth requirement on the 16 -core SMP system. However, on the 64 -core CMP simulator the memory pressure is not high due to the shared last-level cache (LLC) which accommodates tremendous read-write sharing in SIFT. Thus it does not affect the scaling performance. In short, understanding the characterization of SIFT can help identify the program bottlenecks and give us further insights into designing better systems.

关键词： Bandwidth HDTV Optimization Scalability Pixel transform coding Histograms

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A New Method of Subway Tunnel Crack Image Compression Based on ROI and Motion Estimation

A New Method of Subway Tunnel Crack Image Compression Based ...

引用

International Conference on Intelligent Information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Xiaoyang Wu Yun Liu Dapeng Qi Zhenjiang Zhang Department of Electronic and Information Engineering Beijing Jiaotong University Beijing China

Aiming at the characteristics of the subway tunnel crack images, this paper presents a new method of subway tunnel crack image compression based on region of interest and motion estimation. It contains three key parts: the method of key frame image compression based on Discrete Cosine transformation, the method of internal frame image compression based on forward predictive coding and motion estimation, the method of lossless image compression based on crack information database and suspected crack regions. The simulation experiment results show that this method can not only enhance the image compression ratio without losing any information of images in the region of interest, but also interface with the existing subway tunnel crack recognition system very well and make good use of the data from the crack recognition system database and the images in the disk array.

关键词： Image coding Discrete cosine transforms transform coding Motion estimation Thyristors Predictive coding Databases

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Protection of privacy in JPEG files using reversible information hiding

Protection of privacy in JPEG files using reversible informa...

引用

IEEE International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)

作者： Michiharu Niimi Fuyuki Masutani Hideki Noda Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Japan

ISBN: (纸本)9781467350839

The privacy of unknown person may be included in the digital images unintentionally. The action of the file upload of it would constitute an invasion of his/her privacy. The JPEG files may include an exif information which is regarded as personal privacy. For these two privacy problems, we propose a privacy protection technique for JPEG files using reversible information hiding. We adopt the reversible information hiding for the region included privacy in the image. We are also able to protect personal privacy if we embed an exif information into the region. We use Coltuc's method, which changes the pixel value to carry the additional information directly, as a reversible information hiding. Although Coltuc's method modifies the pixel value of cover image directly, we apply this to quantized DCT coefficients of it. In the experiments, we investigate our method and show an example of privacy protection image.

关键词： Privacy Discrete cosine transforms transform coding PSNR Artificial intelligence Communication systems

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Smart video packet trimming technique over congested networks

Smart video packet trimming technique over congested network...

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International Conference on Information and Communication Technology Convergence (ICTC)

作者： Amer Zaheer Tariq Saraj Asim Rasheed Touseef Javed Amir Qayyunr Center of Research in Networks and Telecom (CoReNeT) Muhammad Ali Jinnah University Islamabad Pakistan

In past few years, multimedia traffic is growing and Internet have maximum portion of multimedia traffic. This traffic trend is expected to increase due to multimedia applications. Best effort Internet architecture poses design limitations for multimedia traffic. IPTV like applications require higher bandwidth, low packet loss, low delays and jitter effects to transmit high quality video contents. Packet loss due to limited band width and congestion can negatively impact on Quality of Experience(QoE). Packet trimming based innovative scheme is proposed in this article to deal packet loss and improve QoE. Proposed scheme eliminate the chance of packet loss during congestion. Packet trimming scheme better handle congestion which improve video smoothness, interactivity and frame quality. Test-bed implementation and subsequent analyses shows promising improvement in video Quality of Experience over same Quality of Service.

关键词： transform coding Streaming media Video recording Quality assessment Visualization Packet loss

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Finding a suitable wavelet for image compression applications

Finding a suitable wavelet for image compression application...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： S. Masud J.V. McCanny DSiP Laboratories School of Electrical Engineering and Computer Science Queen''s University Belfast Ireland Queen's University Belfast Belfast Belfast GB

In this paper we assess the relative merits of various types of wavelet functions for use in a wide range of image compression scenarios. We have delineated different algorithmic criteria that can be used for wavelet evaluation. The assessment undertaken includes both algorithmic aspects (fidelity, perceptual quality) as well as suitability for real-time implementation in hardware. The results obtained indicate that of the wavelets studied the biorthogonal 9&7 taps wavelet is the most suitable from a compression perspective and that the Daubechies 8 taps gives best performance when assessed solely in terms of statistical measures.

关键词： Image coding Distortion measurement Wavelet analysis Filters Application software Wavelet transforms Image quality Quantization transform coding PSNR

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Design of high-performance transform and quantization circuit for unified video CODEC

Design of high-performance transform and quantization circui...

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Seonyoung Lee Kyeongsoon Cho Department of Electronics and Information Engineering Hankuk University of Foreign Studies Yongin si South Korea

This paper presents the new high-performance circuit architecture of the transform and quantization for unified video CODEC. The proposed architecture can be applied to all kinds of transforms for the video compression standards such as JPEG, MPEG-1/2/4, H.264 and VC-1. It exploits the similarity of 4-point DCT and 8-point DCT using permutation matrices. Since our circuit accepts the transform coefficients from the users, it can be extended very easily to cover any kind of DCT-based transforms for future standards. The multipliers in the transform circuit are shared by the quantization circuit in order to minimize the circuit size. The quantization operations are performed using spare clock cycles during the transform operations in order to minimize the number of clock cycles required. We described the proposed transform circuit at RTL and verified its operation on FPGA board.

关键词： Quantization Circuits Video codecs Discrete cosine transforms transform coding Clocks Discrete transforms Hardware design languages Digital multimedia broadcasting Video compression

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Study of Copy-Move Forgery Detection Techniques in Images

Study of Copy-Move Forgery Detection Techniques in Images

引用

International Conference on Reliability, Infocom Technologies and Optimization (ICRITO) (Trends and Future Directions)

作者： Ankita Bansal Aditya Atri Division of Information Technology Netaji Subhas University of Technology Delhi India

ISBN: (数字)9781728170169

ISBN: (纸本)9781728170176

With the evolution of tools used for image editing in today's world, the images can be manipulated with ease. Resizing, cloning, cropping, etc., becomes easy and fast while on the other end, a great challenge in front of the world is determining whether an image has been tempered or not. A very popular manipulation method for tempering images is Copy-move forgery in which a part of an image is duplicated and pasted in some other location of the same image. Major research has been going on in detection of copy-move forgery. A detailed review and analytical discussion has been presented in this paper along with pros and cons of each of the detection techniques used for copy-move forgery detection.

关键词： Forgery Feature extraction Discrete cosine transforms Image coding Robustness transform coding Splicing

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