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An overview of security issues in streaming video

An overview of security issues in streaming video

引用

International Conference on Information Technology: Coding and Computing (ITCC)

作者： E.T. Lin G.W. Cook P. Salama E.J. Delp Video and Image Processing Laboratory(VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Electrical and Computer Engineering Purdue School of Engineering and Technology Purdue University Indiana University Indianapolis IN USA

The article describes some of the security issues in streaming video over the Internet. If high quality video sequences are to be delivered to computers and digital television systems over the Internet in our "di... 详细信息

ISBN: (纸本)0769510620

关键词： Streaming media video compression Bandwidth Internet Protection Decoding Security video sequences IP networks Authentication

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New algorithms for computing directional discrete Fourier transforms

New algorithms for computing directional discrete Fourier tr...

引用

IEEE International Conference on image processing

作者： M.S. Pattichis R. Zhou B. Raman Department of Electrical and Computer Engineering Image and Video Processing and Communications Laboratory USA Albuquerque High Performance Computing Center University of New Mexico Albuquerque NM USA

New algorithms for computing the discrete Fourier transform (DFT) spectra along different directions are derived and implemented. For computing the DFT spectrum along any given direction (containing N DFT frequencies), a new algorithm is presented that requires N(N-1) additions and a single 1-D FFT. As expected, for a single direction, the directional FFT algorithm is significantly faster than standard 2-D FFT algorithms that compute the entire spectrum (all results are compared against FFTW and FFTPACK). A scalable extension of the unidirectional algorithm for computing the entire DFT spectrum is also derived and implemented. The three most promising features of the new algorithm are that: (i) computation scales nearly linearly with the number of DFT frequencies computed, (ii) the algorithm uses a reduced number of multiplications (yet uses more additions), and (iii) it is more accurate.

关键词： Discrete Fourier transforms Flexible printed circuits High performance computing Frequency Laboratories Electronic mail Scientific computing Fast Fourier transforms Shape MPEG 4 Standard

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Multimedia security: Does signal processing have a place in securing the digital world?

Multimedia security: Does signal processing have a place in ...

引用

European Signal processing Conference (EUSIPCO)

作者： Edward J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette Indiana

With the recent growth of networked multimedia systems, techniques are needed to prevent (or at least deter) the illegal copying, forgery and distribution of digital media elements such as audio, images and video. The problem is that a copy of a media element is identical to the original. It is also desirable to determine where and by how much a multimedia element has been changed from the original. One classical approach to the problem of protecting "digital content" has been the use of cryptographic methods such as encryption and authentication. Recently other methods have been proposed to improve one's claim of ownership over a digital media element by inserting a small amount of distortion directly into the media element. This distortion, known as a digital watermark, can be used to uniquely identify the owner of the content. Digital watermarking research is mainly the domain of the signal processing community that is very naive when considering real world security problems. Also the attitude of the academic community that it has the "right" to copy and reproduce any multimedia element is curious at best and perhaps conveys the wrong message to our students. The use of the "Lena" image is a good example of this. In this talk I will survey the current state of multimedia security and describe important research issues. I will also express some concern that perhaps we in the signal processing community might want to understand the "security scenario" before making grandiose claims about how our latest watermarking technique will save the world!

关键词： Multimedia communication Media Signal processing Watermarking Communities Streaming media

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A rate-distortion approach to wavelet-based encoding of predictive error frames

A rate-distortion approach to wavelet-based encoding of pred...

引用

IEEE International Conference on image processing

作者： E. Asbun P. Salama E.J. Delp Video and Image Processing Laboratory School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Electrical and Computer Engineering Purdue School of Engineering and Technology Indiana University-Purdue University Indianapolis Indianapolis IN USA

We develop a framework for efficiently encoding predictive error frames (PEF) as part of a rate scalable, wavelet-based video compression algorithm. We investigate the use of rate-distortion analysis to determine the significance of coefficients in the wavelet decomposition. Based on this analysis, we allocate the bit budget assigned to a PEF to the coefficients that yield the largest reduction in distortion, while maintaining the embedded and rate scalable properties of our video compression algorithm.

关键词： Rate-distortion Encoding image coding video compression computer errors Redundancy Wavelet analysis Decoding Scalability Transform coding

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Encoding of predictive error frames in rate scalable video codecs using wavelet shrinkage

Encoding of predictive error frames in rate scalable video c...

引用

IEEE International Conference on image processing

作者： E. Asbun P. Salama E.J. Delp Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Rate scalable video compression is appealing for low bit rate applications, such as video telephony and wireless communication, where bandwidth available to an application cannot be guaranteed. In this paper, we investigate a set of strategies to increase the performance of SAMCoW, a rate scalable encoder. These techniques are based on based on wavelet decomposition, spatial orientation trees, and motion compensation.

关键词： Encoding video codecs image coding video compression Bit rate Application software Wavelet coefficients Scalability computer errors image processing

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Very low bit rate wavelet-based scalable video compression

Very low bit rate wavelet-based scalable video compression

引用

IEEE International Conference on image processing

作者： E. Asbun P. Salama Ke Shen E.J. Delp Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Rate scalable video compression is appealing for low bit rate applications, such as video telephony and wireless communication, where bandwidth available to an application cannot be guaranteed. A technique known as scalable adaptive motion compensated wavelet (SAMCoW) compression is described. SAMCoW is well suited for data rates less than 32 kbps. Several techniques to improve the subjective picture quality of SAMCoW are investigated. These include the use of B frames, half-pixel accuracy, and unrestricted motion vectors.

关键词： Bit rate video compression Telephony Wireless communication Bandwidth

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A Gaussian mixture model for edge-enhanced images with application to sequential edge detection and linking

A Gaussian mixture model for edge-enhanced images with appli...

引用

IEEE International Conference on image processing

作者： G.W. Cook E.J. Delp Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

We present a new stochastic model for pixels in an edge-enhanced image. The model is robust because it allows for the possibilities of false and multiple edges, and may be efficiently estimated using a expectation-maximization technique with a minimum description length metric. The direct applicability of the model for the sequential edge linking algorithm is investigated.

关键词： image edge detection Joining processes Pixel Density functional theory Application software image processing Stochastic processes Statistics Signal to noise ratio Laboratories

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Perceptual relevance of objectively measured descriptors for speaker characterization

Perceptual relevance of objectively measured descriptors for...

引用

1998 23rd IEEE International Conference on Acoustics, Speech and Signal processing, ICASSP 1998

作者： Necioglu, Burhan F. Clements, Mark A. Barnwell, Thomas P. Schmidt-Nielsen, Astrid Center for Signal and Image Processing School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States Code 5513 Naval Research Laboratory 4555 Overlook Ave SW Washington DC 20375 United States

ISBN: (纸本)0780344286

Subjective testing of speaker recognizability is an intricate, time consuming and very expensive process, but using objectively measurable descriptors to augment the subjective speaker recognizability tests could result in increased efficiency and reliability. This paper describes our investigation into the relevancy of a set of objective descriptors to human perception of speaker identity through multidimensional scaling (MDS) of subjective speaker pair similarity judgments. The evaluated objective descriptors can achieve same/different detection error rates as low as 4.13% for male speaker pairs, and 8.17% for female speaker pairs, with only 3 seconds of speech. Five descriptors related to glottal, vocal tract and prosodic features were found to have significant correlations with the perceptual dimensions of the MDS solutions. © 1998 IEEE.

关键词： Subjective testing

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The effect of matching watermark and compression transforms in compressed color images

The effect of matching watermark and compression transforms ...

引用

IEEE International Conference on image processing

作者： R.B. Wolfgang C.I. Podilchuk E.J. Delp Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

The growth of networked multimedia systems has complicated copyright enforcement relative to digital images. One way to protect the copyright of digital images is to add an invisible structure to the image (known as a digital watermark) to identify the owner. In particular, it is important for Internet and image database applications that as much of the watermark as possible remain in the image after compression. image adaptive watermarks are particularly resistant to removal by signal processing attack such as filtering or compression. Common image adaptive watermarks operate in the transform domain (DCT or wavelet); the same domains are also used for popular image compression techniques (JPEG, EZW). This paper investigates whether matching the watermarking domain to the compression transform domain will make the watermark more robust to compression.

关键词： Watermarking image coding Digital images Multimedia systems Protection Internet image databases Adaptive signal processing Adaptive filters Information filtering

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Normal mammogram analysis and recognition

Normal mammogram analysis and recognition

引用

IEEE International Conference on image processing

作者： Sheng Liu C.F. Babbs E.J. Delp Department of Basic Medical Sciences School of Veterinary Medicine Purdue University West Lafayette IN USA Video and Image Processing Laboratory (VIPER) School of Electrical and Computer Engineering Purdue University West Lafayette IN USA

Presents a novel approach to the problem of computer aided analysis of digital mammograms for breast cancer detection: namely, the development of algorithms to recognize unequivocally normal mammograms. First, the authors eliminate amorphous "clouds" or "blobs" in mammograms produced by normal glandular tissue of varying density using local average subtraction. Then the authors identify and remove normal connective tissue markings based on a set of specially designed line detectors. Any abnormality that may exist in the mammogram is therefore enhanced in the residual image, which makes the decision regarding the normality of the mammogram, much easier.

关键词： Lesions Biomedical imaging Medical diagnostic imaging Breast Cancer Tumors image processing Laboratories Biomedical engineering computer aided analysis

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