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检索条件"主题词=transform coding"

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Comparison of local feature descriptors for mobile visual search

Comparison of local feature descriptors for mobile visual se...

引用

IEEE International Conference on Image Processing

作者： Vijay Chandrasekhar David M. Chen Andy Lin Gabriel Takacs Sam S. Tsai Ngai-Man Cheung Yuriy Reznik Radek Grzeszczuk Bernd Girod Information Systems Laboratory University of Stanford Stanford CA USA Qualcomm Inc. San Diego CA USA Nokia Research Center Palo Alto CA USA

We evaluate the performance of MPEG-7 image signatures, Compressed Histogram of Gradients descriptor (CHoG) and Scale Invariant Feature transform (SIFT) descriptors for mobile visual search applications. We observe that SIFT and CHoG outperform MPEG-7 image signatures greatly in terms of feature-level Receiver Operating Characteristic (ROC) performance and image-level matching. Moreover, CHoG descriptors demonstrate such gains while being comparable with MPEG-7 image signatures in bit-rate.

关键词： transform coding Histograms Visualization Accuracy Mobile communication Computer vision Databases

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A fragile watermarking algorithm based on logistic system and JPEG

A fragile watermarking algorithm based on logistic system an...

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International Conference on Image Analysis and Signal Processing, IASP

作者： Pengfei Wang Yewang Chen School of Computer Science Anhui University of Science and Technology Maanshan China School of Computer Science Nanjing University of Science and Technology of PLA Nanjing China College of Computer Science Technology of Huaqiao University Xiamen China

A fragile watermarking algorithm for image contents integrity verification based on logistic system and JPEG (Joint Photographic Experts Group) is proposed in this paper. The watermarking process is carried out during JPEG quantization process. Firstly, each 8×8 DCT coefficients block is subdivided into 4 groups based on logistic system; then, in order to obtain the watermarked JPEG image, all of the groups are check coded by the check bits. The watermarked JPEG image remains high quality. The tamper probability is determined by checking the DCT coefficients groups.

关键词： Watermarking Logistics transform coding Image coding Discrete cosine transforms Computer science Authentication Digital images Image storage Educational institutions

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MPEG-4-based 3D video contents creation method using time-of-flight sensor for 3DTV

MPEG-4-based 3D video contents creation method using time-of...

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International Symposium on Electronics in Marine (ELMAR)

作者： Ji-Ho Cho Sung-Yeol Kim Kwan H. Lee Gwangju Institute of Science and Technology Gwangju South Korea University of Tennessee Knoxville TN USA

Three-dimensional (3D) TV is considered as the next-generation broadcasting service. In this paper, we propose a new scheme to generate 3D video contents using a time-of-flight (TOF) range sensor for the 3DTV service. TOF sensors are a relatively novel technology allowing for the real-time capture of both photometric and geometric scene information. In this work, in order to generate natural 3D video, we develop a practical pipeline including TOF data processing and MPEG- 4-based data transmission and reception. First, we acquire color and depth videos from a TOF range sensor. Then, alpha matting and depth map enhancement are performed to handle fuzzy and hairy objects that are traditionally difficult in image processing. Thereafter, the generated video-plus-depth data are combined with interactive computer graphic models in the MPEG-4 multimedia framework. Since we represent the depth video with a newly designed MPEG-4 Binary Format for Scene (BIFS) node and describe a dynamic 3D scene in the multimedia framework, the 3D video contents can be streamed to the client side through a network.

关键词： Three dimensional displays Streaming media transform coding Multimedia communication Image color analysis Cameras Broadcasting

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A Format-Compliant Encryption Scheme for JPEG2000 Codestream

A Format-Compliant Encryption Scheme for JPEG2000 Codestream

引用

2010 IEEE International Conference on Information Theory and Information Security(2010 IEEE 国际信息论与信息安全会议)

作者： Jiafu Wen Jiazhen Wang Bin Zhang Zhande Li Zilong Huang Computer Engineering Department Mechanical Engineering College Shijiazhuang China

In this paper, an efficient and secure encryption scheme for JPEG2000 codestream is proposed. The scheme encrypts each codeblock contribution to a packet (CCP) and does not introduce superfluous JPEG2000 markers in the protected codestream. It achieves full information protection for data confidentiality, and maintains all the advanced features of the original JPEG2000 codestream such as error resilience and scalability. Theoretical analysis and experimental results demonstrate the merits of the proposed scheme.

关键词： transform coding Encryption Encoding Scalability Image coding Correlation

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RVC: A multi-decoder CAL Composer tool

RVC: A multi-decoder CAL Composer tool

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Conference on Design and Architectures for Signal and Image Processing

作者： F. Palumbo D. Pani E. Manca L. Raffo M. Mattavelli G. Roquier DIEE-Department of Electrical and Electronic Engineering University of Cagliari Cagliari Italy EPF Lausanne Lausanne Switzerland

The Reconfigurable Video coding (RVC) framework is a recent ISO standard aiming at providing a unified specification of MPEG video technology in the form of a library of components. The word “reconfigurable” evokes run-time instantiation of different decoders starting from an on-the-fly analysis of the input bitstream. In this paper we move a first step towards the definition of systematic procedures that, based on the MPEG RVC specification formalism, are able to produce multi-decoder platforms, capable of fast switching between different configurations. Looking at the similarities between the decoding algorithms to implement, the papers describes an automatic tool for their composition into a single configurable multi-decoder built of all the required modules, and able to reuse the shared components so as to reduce the overall footprint (either from a hardware or software perspective). The proposed approach, implemented in C++ leveraging on Flex and Bison code generation tools, typically exploited in the compilers front-end, demonstrates to be successful in the composition of two different decoders MPEG-4 Part 2 (SP): serial and parallel.

关键词： Decoding Corporate acquisitions transform coding Hardware Software Flexible printed circuits Libraries

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Service Trustiness and Resource Legitimacy in Cloud Computing

Service Trustiness and Resource Legitimacy in Cloud Computin...

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International Conference on P2P, Parallel, Grid, Cloud and Internet Computing (3PGCIC)

作者： Jong P. Yoon Zhixiong Chen Department of Math and Computer Information Science Mercy College Dobbs Ferry NY USA

Cloud computing is emerging as a virtual model in support of “everything-as-a-service” (XaaS). Service providers in a cloud provide XasS of resources. There are numerous providers involved in a cloud such as feeders, owners, delegators and creators who are less likely the same agent. Consequently, without identifying the credential of their providers, cloud resources cannot be securely managed by traditional security models and services may be trustless. In this paper, we propose a new security technique to measure the trustiness of the cloud resources. Using the metadata of resources, the technique binds authorization policies to compute the trace ability between the resources and the provider's credential. The contribution of this paper includes a mechanism of the privilege chains that can be used to verify the legitimacy of cloud resources and to measure the trustiness of cloud services.

关键词： Clouds transform coding Authorization Context Cloud computing Virtual machining

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Fast zonal DCT-based image compression for Wireless Camera Sensor Networks

Fast zonal DCT-based image compression for Wireless Camera S...

引用

Workshops on Image Processing Theory, Tools and Applications, IPTA

作者： Leila Makkaoui Vincent Lecuire Jean-Marie Moureaux Centre de Recherche en Automatique de Nancy (CRAN) Nancy-Université CNRS Vandoeuvre-les-Nancy France

This paper deals with image compression over Wireless Camera Sensor Networks (WCSNs) in order to decrease the energy consumption of sensors and thus to maintain a long network lifetime. As the radio tranceiver is the most power greedy components of sensor nodes, it seems natural to consider lossy compression before transmission as the appropriate answer to the problem of energy consumption. However, the limitation of sensor nodes in terms of memory as well as processor speed makes most of the compression algorithms inapplicable. Indeed, the most popular methods such as JPEG or JPEG2000 can yield a higher energy consumption than when transmitting uncompressed images. Here we propose to solve this problem by the design of a fast zonal DCT-based image compression algorithm which allows an efficient tuning of the trade-off between energy consumption and image distortion, as shown by experimental results provided in the paper.

关键词： Discrete cosine transforms Image coding Energy consumption transform coding Wireless sensor networks Shape PSNR

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Halftoning-based self-embedding watermarking for image authentication and recovery

Halftoning-based self-embedding watermarking for image authe...

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Midwest Symposium on Circuits and Systems (MWSCAS)

作者： Jose Antonio Mendoza-Noriega Brian M. Kurkoski Mariko Nakano-Miyatake Hector Perez-Meana Department of Information and Communication Engineering University of Electro-Communications Chofu Tokyo Japan Mechanical and Engineering National Polytechnic Institute of Mexico (IPN) Mexico

This paper presents a block-wise semi-fragile watermarking algorithm for image content authentication, with tamper region localization and recovery capability. A halftone image is generated by the error diffusion halftoning method and embedded using the Quantization Index Modulation (QIM) method in the Discrete Cosine transform (DCT) domain of the original image. The proposed method is robust to JPEG compression, because the halftone image is embedded as a watermark sequence in the middle frequencies of the DCT coefficients using QIM. Also to improve the recovered image quality, Multilayer Perceptron neural network (MLP) is used in inverse halftoning process. Data in the tampered region is estimated with gray-scale data obtained from the MLP, using the embedded halftone as input. The experimental results show desirable performance of the proposed algorithm, such as watermark imperceptibility, robustness to JPEG compression, detection accuracy of tampered region and high quality of recovered image.

关键词： Watermarking Authentication Discrete cosine transforms Robustness transform coding Image coding Image generation Quantization Frequency Image quality

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Robust Image Watermarking Using Independent Component Analysis

Robust Image Watermarking Using Independent Component Analys...

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International Symposiums on Information Processing (ISIP)

作者： Abolfazl Hajisami Shahrokh Ghaemmaghami Department of Electrical Engineering Sharif University of Technology Tehran Iran Department of Electrical Engineering and Electronics Research Institute Sharif University of Technology Tehran Iran

This paper proposes an image watermarking scheme for copyright protection based on Independent Component Analysis (ICA). In the suggested scheme, we divide the original image into blocks and use the ICA to project the image into a basis with its components as statistically independent as possible. The data embedding is carried out in cumulative form in the ICA basis and also the ICA is used for watermark extraction. The extraction process could be either non-blind, through a straightforward procedure, or blind, via a tricky method we propose. Experimental results show that the new method outperforms some well-known image watermarking methods in spatial or frequency domain and is robust against various attacks, including noise addition, resizing, low pass filtering, multiple marks embedding, JPEG compression, gray-scale reduction, and cropping parts of image.

关键词： Watermarking Robustness transform coding Noise Gray-scale Image coding Independent component analysis

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Selection of Photos for Album Building Applications

Selection of Photos for Album Building Applications

引用

International Conference on Pattern Recognition

作者： Marta Egorova Ilia Safonov Department of CyberneticsNational Nuclear Research University “Moscow Engineering Physics Institute”Moscow Russia Department of Cybernetics “Moscow Engineering Physics Institute” Moscow Russia

In this work we propose a new algorithm for selection of high-quality photos for album building applications. We describe how to select features for detection well-exposed, sharp and artifact-free photos. We considered two approaches: the first, typical way when all features are used in single AdaBoost classifiers committee and the second way, when decision tree, including 3 committees. Careful analysis of features and decision tree construction allowed better outcomes to be reached.

关键词： Decision trees Image color analysis Feature extraction Classification algorithms Colored noise transform coding

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