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检索条件"主题词=transform coding"

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AN ASIC IMPLEMENTATION OF THE MPEG-2 AUDIO DECODER

AN ASIC IMPLEMENTATION OF THE MPEG-2 AUDIO DECODER

引用

IEEE International Conference on Consumer Electronics (ICCE)

作者： Sung-Chul Han Sung-Chul Han Sun-Kook Yoo Sun-Kook Yoo Nam-Hun Jeong Nam-Hun Jeong Sung-Wook Park Sung-Wook Park Joon-Suk Kim Joon-Suk Kim Young-Tae Han Young-Tae Han Dae-Hee You Dae-Hee You Department of Electronic Engineering ASSP Laboratory Yonsei University South Korea Department of Medical Engineering Yonsei University South Korea Research Center Korea Telecom South Korea

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A modified anti-forensic technique for removing detectable traces from digital images

A modified anti-forensic technique for removing detectable t...

引用

International Conference on Computer Communication and Informatics (ICCCI)

作者： Athira B. Kaimal S. Manimurugan J. Anitha Department of Computer Science and Engineering Karunya University India

ISBN: (纸本)9781467329064

The increasing attractiveness and trust on digital photography has given rise to new acceptability issues in the field of image forensics. There are many advantages to using digital images. Digital cameras produce immediate images, allowing the photographer to outlook the images and immediately decide whether the photographs are sufficient without the postponement of waiting for the film and prints to be processed. It does not require external developing or reproduction. Furthermore, digital images are easily stored. No conventional "original image" is prepared here like traditional camera. Therefore when forensic researchers analyze the images they don't have access to the original image to compare. Fraud by conventional photograph is relatively difficult, requiring technical expertise. Whereas significant features of digital photography is the ease and the decreased cost in altering the image. Manipulation of digital images is simpler. With some fundamental software, a digitally-recorded image can easily be edited. The most of the alterations include borrowing, cloning, removal and switching parts of a digital image. A number of techniques are available to verify the authenticity of images. But the fact is that number of image tampering is also increasing. The forensic researchers need to find new techniques to detect the tampering. For this purpose they have to find the new anti-forensic techniques and solutions for them. In this paper a new anti-forensic technique is considered, which is capable of removing the evidences of compression and filtering. It is done by adding a specially designed noise called tailored noise to the image after processing. This method can be used to cover the history of processing in addition to that it can be also used to remove the signature traces of filtering.

关键词： Image coding transform coding Forensics History Digital images Educational institutions Noise

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A 4-way pipelined processing architecture for three step search block-matching motion estimation

A 4-way pipelined processing architecture for three step sea...

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： Chi-Geun Lee Ho-Geun Lee Hyun-Jin Shim Sung-Tae Jung Sang-Seol Lee Department of Electrical Electronic and Information Engineering Wonkwang University Iksan Jeonbuk South Korea

A novel 4-way pipelined processing architecture is presented for three-step search block-matching motion estimation. For the 4-way pipelined processing, we have developed a method which divides the current block and search area into 4 subregions respectively and processes them concurrently. Also, we have developed a memory partitioning method to access pixel data from the 4 subregions concurrently without memory conflict. The architecture has been designed and simulated with C language and VHDL. Simulation results show that the proposed architecture achieves a high performance for real time motion estimation

关键词： Motion estimation Computer architecture Clocks Hardware Video coding transform coding Video sequences Data compression Very large scale integration Bandwidth

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Towards a new numbering-combinations-based coder for image compression and transmission over a noisy channel

Towards a new numbering-combinations-based coder for image c...

引用

International Conference on Advanced Technologies for Signal and Image Processing (ATSIP)

作者： A. Kilani A. Makhloufi A. Ben Hamida H. Hamem National School of Engineering of Gabes (ENIG) Tunsia National School of Electronics and Telecommunications of Sfax (ENET‘COM) Tunisia National School of Engineering of Sfax (ENIS) Tunisia University of Moncton Canada

ISBN: (纸本)9781467385275

The image compression has always been one of the competitive fields of studies. It aims to represent an image in a minimal size in bytes without compromising the image quality. Our method; the numbering combinations method, consists on calculating all the possible combinations of the pixels and associate an index to our image through all the mentioned combinations. This index is a unique identifier of the image. However, with real images, the index of an image is a big number and it is difficult to manipulate it or to talk about image compression. The idea is to implement our algorithm as an image compression technique and test it in transmission to judge its performances.

关键词： Indexes Image coding transform coding Noise measurement Q-factor Image reconstruction Signal to noise ratio

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Compressed-domain video watermarking of MPEG streams

Compressed-domain video watermarking of MPEG streams

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： D. Simitopoulos S.A. Tsaftaris N.V. Boulgouris M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece Electrical and Computer Engineering Dept NorthWestern University Evanston IL USA

A new technique for watermarking of MPEG compressed video streams is proposed. The watermarking scheme operates directly in the domain of MPEG program streams. Perceptual models are used during the embedding process in order to preserve the video quality. The watermark is embedded in the compressed domain and is detected without the use of the original video sequence. Experimental evaluation demonstrates that the proposed scheme is able to withstand a variety of attacks. The resulting watermarking system is fast and reliable, and is suitable for copyright protection and real-time content authentication applications.

关键词： Video compression Watermarking transform coding Streaming media Discrete cosine transforms Informatics Telematics Real time systems Authentication DVD

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Fault-Tolerant Application-Specific Network-on-Chip Design using Discrete Particle Swarm Optimization

Fault-Tolerant Application-Specific Network-on-Chip Design u...

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International Conference on Industrial and Information Systems, ICIIS

作者： P. Veda Bhanu J. Soumya BITS-Pilani Telangana India

ISBN: (数字)9781728137063

ISBN: (纸本)9781728137070

This paper presents a meta-heuristic based technique Discrete Particle Swarm Optimization (DPSO) to address the permanent link failures in Application-Specific Network-on-Chip (NoC) design. Application-specific NoC based designs are more flexible with the current application requirements. With the advent of technology, dense integration of components on a chip gradually degraded the reliability and system performance. Therefore, to improve the reliability and system performance in application-specific NoC design, the proposed technique places the spare links in the likelihood of link faults. Experimentations have performed for different application benchmarks to leverage the efficiency of proposed technique. The results show that overhead in communication cost over fault-free result is minimum.

关键词： Topology transform coding Fault tolerance Fault tolerant systems Particle swarm optimization Benchmark testing Conferences

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Adaptive local feature based multi-scale image hashing for robust tampering detection

Adaptive local feature based multi-scale image hashing for r...

引用

IEEE Region 10 International Conference TENCON

作者： Cai-Ping Yan Chi-Man Pun Xiao-Chen Yuan Department of Computer and Information Science University of Macau Macau SAR China

ISBN: (纸本)9781479986422

This paper proposes a novel multi-scale image hashing method by using the location-context information of the features generated by adaptive local feature extraction techniques. The adaptive local feature extraction method is proposed for more robust feature descriptors. The global hash is calculated to determine whether the received image has been maliciously tampered. The multi-scale hash is calculated to locate the tampered regions. Experimental results show that the proposed tampering detection scheme is very robust against the content-preserving attacks, including both common signal processing and geometric distortions.

关键词： Robustness Feature extraction transform coding Distortion Indexes

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Robust moving video object segmentation in the MPEG compressed domain

Robust moving video object segmentation in the MPEG compress...

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IEEE International Conference on Image Processing

作者： Xiao-Dong Yu Ling-Yu Duan Qi Tian School of Electrical and Electronic Engineering Nanyang Technological University Singapore Institute for Infocomm Research Agency for Science Technology and Research Singapore

ISBN: (纸本)0780377508

In this paper, we proposed a robust moving video object segmentation algorithm using features in the MPEG compressed domain. We first cluster the motion vectors and produce a motion mask. Then, a difference mask at 8 x 8 block size is extracted from the DC image by background subtraction method. Finally, the motion mask and the difference mask are combined conditionally to generate the final object mask based on a set of rules that are application specified and is obtained with learning or heuristic based methods. The experimental results show that this object segmentation scheme is more robust than those using DC image or motion vectors only.

关键词： Robustness Video compression Object segmentation transform coding Clustering algorithms Discrete cosine transforms Image coding Image segmentation Decoding Video surveillance

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A novel discrete wavelet transform based digital watermarking scheme

A novel discrete wavelet transform based digital watermarkin...

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IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Yong-Gang Fu Hui-Rong Wang College of Computer Engineering Jimei University Xiamen China College of Chinese Literature Jimei University Xiamen China

In this paper, a simple watermarking scheme for digital image authentication is proposed. The insertion of a binary watermark is accomplished by adding to the lower frequency subband of discrete wavelet transform (DWT) decomposition of host image with a random binary image obtained by random permutations. The proposed scheme is secure, fast, and is immune of the well-known quantization attack. Especially the watermark extracting process has no need of the original image.

关键词： Discrete wavelet transforms Watermarking Robustness Frequency transform coding Image coding Discrete cosine transforms Image processing Educational institutions Digital images

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DCT-Based Watermarking By Quotient-Embedding Algorithm

DCT-Based Watermarking By Quotient-Embedding Algorithm

引用

International Conference on Innovative Computing, Information and Control (ICICIC)

作者： Ching-Yu Yang Wu-Chih Hu Jen-Yuan Lai Department of Computer Science and Information Engineering National Penghu University Taiwan

ISBN: (纸本)9781424431977;9780769531618

A simple watermarking scheme based on the discrete cosine transform (DCT) is proposed. To increase the hidden capacity while maintaining the robustness of the proposed method, the authors use quotient-embedding algorithm to hide the secret message in the selected low-frequency coefficients of a DCT block. Simulations show that the stego-images generated by the proposed method do robustness against image processing operations, such as JPEG2000, JPEG, cropping, processing the negative, quantization, low-pass filtering, noise additions, and so on. Moreover, the PSNR is not bad while the resultant perceived quality and hiding capability are good.

关键词： Watermarking Discrete cosine transforms transform coding PSNR Robustness Image processing Filtering

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