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检索条件"主题词=Transform coding"

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Selective encryption of video MPEG use RSA algorithm

Selective encryption of video MPEG use RSA algorithm

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International Conference on Information Technology, Computer and Electrical Engineering (ICITACEE)

作者： Prati Hutari Gani Maman Abdurohman Telkom School of Computing Telkom University Bandung Indonesia

Selective encryption is a technique to encrypt a portion of the video data. In this case, it is encrypted by RSA algorithm. It is one of the public - key cryptosystem that is used to provide privacy and authentication of digital data. Security of this algorithm lies in the difficulty of factoring very large modulus n. In this project, the video format are MPEG - 1 and MPEG - 2, because they have almost the same bit stream structure, so the processing by using an algorithm. In this final project will be built a software using the Java platform. Testing on this project to encrypt and decrypt video formats, MPEG-1 and MPEG-2, so the security of video can be realized by using the method of selective encryption. Other parameters are the key length in the RSA algorithm which has been adapted and Brute Force Attacks.

关键词： Cryptography transform coding

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Analysis of Content-Aware Image Compression with VGG16

Analysis of Content-Aware Image Compression with VGG16

引用

International Work Conference on Bio-inspired Intelligence (IWOBI)

作者： Alena Selimović Blaž Meden Peter Peer Aleš Hladnik Faculty of Natural Sciences and Engineering University of Ljubljana Slovenia Faculty of Computer and Information Science University of Ljubljana Slovenia

Content-aware compression based on the use of saliency maps aims to improve the interpretability of an image by encoding the more relevant image regions with a higher quality than the rest of the image. This paper revisits two convolutional neural network (CNN) models based on VGG16, multi-structure region of interest (MS-ROI) and class activation map (CAM), which enable the localization of salient image regions. While the MS-ROI model allows for the localization of multiple salient image regions, the CAM model, on the other hand, tends to localize only the most relevant class. We use the contextual information provided by the obtained saliency maps to guide the compression. By encoding more important image regions at a higher bitrate and less important ones at a lower bitrate, different qualities of compression for the regions of interest and the background are obtained, while also achieving smooth transitions from salient to non-salient regions. The performance of both models is evaluated on images from the MIT Saliency Benchmark dataset and the General-100 dataset, and the results of the compression are compared to the standard JPEG compression at different quality factors. Experimental results show that for the files of approximately same size, the compression methods based on the two CNN models outperform the standard JPEG compression. When comparing the compression based on the MS-ROI model to the compression based on the CAM model, the former is characterized by a higher PSNR and a better visual quality of the obtained images.

关键词： Image coding transform coding Standards Heating systems Q-factor Compression algorithms Feature extraction

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An Improved Flexible Access Control Scheme for JPEG2000 Codestreams

An Improved Flexible Access Control Scheme for JPEG2000 Code...

引用

International Conference on Multimedia and Ubiquitous Engineering (MUE)

作者： Yang Ou Chae Duk Jung Chul Sur Kyung Hyune Rhee Division of Electronic Computer and Telecommunication Engineering Pukyong National University Busan South Korea

ISBN: (纸本)9780769531342

JPEG2000 is the newest image coding standard which provides flexible scalability. Designing an encryption system for scalable JPEG200 codestream is becoming a new challenge. Wu et al. (2007) proposed a flexible access control scheme for JPEG2000 codestream. However, it needs key regeneration whenever users change the preferred progression order. In this paper, we propose an improved flexible access control scheme for JPEG2000 codestreams based on multi-dimensional hash chains (MDHC), in which the keys need not to be regenerated whenever different progression order of packets is required. In particular, we employ multiple hash chains to generate a series of keys to encrypt each packet in the codestream. Furthermore, users can access the encrypted codestream according to any authorized combinations of resolution, quality layer and precinct with as few as possible keys. Also, our proposed scheme is secure against collusion attack as well as unauthorized access.

关键词： Access control Cryptography Image coding transform coding Scalability Security Pervasive computing Telecommunication computing Code standards Telecommunication standards

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The design and implementation of the multi-screen interaction service architecture for the Real-Time streaming media

The design and implementation of the multi-screen interactio...

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International Conference on Natural Computation (ICNC)

作者： Xinfeng Xie Zhongqing Yu Kaixi Wang The Shandong Provincial Engineering Center of Health Informatics Qingdao University Qingdao china

ISBN: (纸本)9781467347129

With the development of the Networks Convergence in China, the multi-screen interaction has been nearer and nearer to us. In order to build a unified service platform which supports the multi-screen interaction, A general application architecture is proposed for the Real-Time streaming media, which supports various platform and terminal. By employing virtual reality, MPEG-4 CODEC, interprocess communication technology and Real-Time streaming media transmission protocol, the Real-Time streaming media system is implemented, which verified the feasibility of the application architecture for multi-screen interaction service.

关键词： Streaming media Servers Real-time systems Protocols Games transform coding Virtual reality

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Development of WWW-based TelePACS using satellite data communication system

Development of WWW-based TelePACS using satellite data commu...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Seoncheol Hwang Jeongwhan Lee Junyoung Lee Jeonghoon Kim Inkwee Choi Gunsoo Shin Heejoung Kim Myoungho Lee Department of Electrical Engineering Yonsei University Seoul South Korea Telemann Company Limited Department of Radiology Yonsei University South Korea

In this paper, we present the WWW (World-Wide-Web)-based TelePACS, which uses the communication network as Asymmetric Satellite Data Communication System (ASDCS). Web-based TelePACS is implemented with JAVA language. Through the Internet, Web-based TelePACS can make it possible for remote hospital or doctor to access PACS data and information easily and cheaply. The ASDCS uses receive-only satellite links for data delivery and PSTN (Public Switched Telephone Network) modem or N-ISDN (Narrow band Integrate Services Digital Network) for communication. The satellite communication linking shows the very high-speed performance such as 10-30 times faster than the modem linking. To solve the speed limits of Internet, JPEG and wavelet compression methods were adapted in WWW-based TelePACS and were evaluated by PSNR (Peak Signal-to-Noise Ratio) and by radiological experts that 10:1 or less JPEG and wavelet compression may be acceptable for diagnostic purposes. Consequently, we get the conclusion that our system is suitable for teleradiology and telemedicine world wide.

关键词： Satellite broadcasting Artificial satellites Variable speed drives Internet Modems Joining processes transform coding PSNR World Wide Web Communication networks

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Blind image quality assessment based on a new feature of nature scene statistics

Blind image quality assessment based on a new feature of nat...

引用

IEEE Visual Communications and Image Processing (VCIP)

作者： Li Song Chen Chen Yi Xu Genjian Xue Yi Zhou Institute of Image Communication and Network Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781479961405

A recently proposed model, known as blind/referenceless image spatial quality evaluator (BRISQUE), achieves the state-of-the-art performance in context of blind image quality assessment (IQA). This model used the predefined generalized Gaussian distribution (GGD) to describe the regularity of natural scene statistics, introducing fitting errors due to variations of image contents. In this paper, a more generalized model is proposed to better characterize the regularity of extensive image contents, which is learned from the concatenated histograms of mean subtracted contrast normalized (MSCN) coefficients and pairwise products of MSCN coefficients of neighbouring pixels. The new feature based on MSCN shows its capability of preserving intrinsic distribution of image statistics. Consequently support vector machine regression (SVR) can map it to more accurate image quality scores. Experimental results show that the proposed approach achieves a slight gain from BRISQUE, which indicates the crafted GGD modelling step in BRISQUE is not essential for final performance.

关键词： Histograms Image quality Feature extraction Fitting Databases transform coding Gaussian distribution

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Packet analyzer for JPEG2000 codestreams and its VHDL model

Packet analyzer for JPEG2000 codestreams and its VHDL model

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： M. Kurosaki A. Ikeda K. Munadi H. Kiya Department of Electrical Engineering Tokyo Metropolitan University Japan Yokogama Electric Corporation Japan

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A pole-zero adaptive algorithm for speech processing

A pole-zero adaptive algorithm for speech processing

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International Phoenix Conference on Computers and Communications (IPCCC)

作者： A.S. Spanias Department of Electrical Engineering Telecommunications Research Center Arizona State University Tempe AZ USA

A pole-zero adaptive algorithm is presented for selective spectral matching. This algorithm is capable of forming highly selective spectral envelopes for accurate fitting of frequency components. This adaptive technique can be employed to reduce the data rate in transform coding of speech, by efficiently 'packing' magnitude and phase information on a spectral envelope. Pole-zero algorithms have been developed and employed in system identification, as well as in spectral matching. In this work, a frequency-selective adaptive process is proposed for the spectral matching of the harmonic frequency components of speech. This process is based on the equation-error adaptive model.< >

关键词： Adaptive algorithm Speech processing Frequency Equations Fitting transform coding Speech coding System identification Cost function Matrix decomposition

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引用

National Conference on Radio Science (NSRC)

作者： S.-n. El-Din M. Moniri School of Engineering rmd advanced Technology Staffordshire University UK

This paper proposes the use of generalized finite automata (GFA) as a method for retrieving the image self-similarity to be used as a measure for benchmarking semi-fragile image authentication techniques. A comparison between PSNR as a conventional-method and the proposed self-similarity measure for several types of images was conducted. These comparisons show that the self-similarity measure has a better correlation with the image perceptual quality than the conventional PSNR. Furthermore, the self-similarity can be used to determine the maximum level of JPEG compression that should be used to benchmark a group of image authentication techniques

关键词： Authentication Image coding transform coding Distortion measurement PSNR Frequency Degradation Automata Image retrieval Robustness

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Depth Estimation and View Synthesis for Narrow-Baseline Video

Depth Estimation and View Synthesis for Narrow-Baseline Vide...

引用

IEEE International Symposium on Circuits and Systems

作者： Qian ZHANG Chun Hui CUI King Ngi NGAN Yu LIU Department of Electronic Engineering The Chinese University of Hong Kong Hong Kong Hong Kong Applied Science and Technology Research Institute Company Limited Hong Kong

ISBN: (纸本)9781467302180

In this paper, we propose the depth estimation and view synthesis approaches for the scene rendering of narrow-baseline videos. Depth estimation is performed by global energy minimization using graph cut technique. A novel smoothness energy term is proposed to enforce powerful smoothness of the estimated depth. In view synthesis, smart hole filling is proposed to efficiently remove the burr artifacts along the object boundary. Experimental results show that compared with the MPEG reference software, our method can generate more accurate depth maps and achieve much better objective (PSNR) and subjective quality in view synthesis.

关键词： Estimation Filling Software transform coding Cameras Density estimation robust algorithm Minimization

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