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An architecture for document management

An architecture for document management

引用

IEEE International conference on image processing

作者： G. Cavalcanti E. Filho Centro de Informatica-CIN Universidade Federal de Pernambuco-UFPE Recife PE Brasil

The main goal of this work is to investigate a computational architecture for a document management environment. Its purpose is to digitalize and extract information from documents of any type, transforming them into structured electronic documents. The environment is divided into specification and extraction modules. In the first module, the user performs the document specification, capturing physical, semantic and process information from the document. The extraction module uses this information, in order to recognize documents of the same class as the specified one. This environment offers the possibility of visualizing the classification results and to correct eventual mistakes it has made. Also, it allows document reconstruction from physical and semantic information captured in the specification module.

关键词： Data mining image recognition Text analysis image analysis Computer architecture image reconstruction image processing image storage image databases visual databases

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In-loop deblocking filter for block based video coding

In-loop deblocking filter for block based video coding

引用

International conference on Signal processing Proceedings (ICSP)

作者： Xiaoyan Sun Feng Wu Shipeng Li Wen Gao Department of Computer Application Harbin Institute of Technology Harbin China Microsoft Research Asia Beijing China

ISBN: (纸本)0780374886

Blocking artifacts are inherent and inevitable phenomena at low bit rates in current block-based video coding schemes. The paper proposes a deblocking technique to reduce blocking artifacts and improve visual quality. Different from the post-processing technique adopted in MPEG-4, the proposed technique is directly applied to the reference image for effective motion prediction instead of just for display purposes. In other words, the deblocking filter is introduced into the motion compensation loop in the video coding. Because of the negative effects of the deblocking filter, such as blurring the details of the image, not every block boundary needs to be filtered. It has to be determined whether the boundaries between two blocks should be filtered or not. Therefore, we also propose a decision-making criterion based on the available motion information (vector and mode). Experimental results show that the proposed deblocking method can improve image quality both in subjective and objective aspects. It also outperforms the post-processing technique in MPEG-4.

关键词： Video coding MPEG 4 Standard Motion compensation Filters Displays Bit rate image quality Discrete cosine transforms image reconstruction Motion estimation

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visual communication: a multi-perspective approach

Visual communication: a multi-perspective approach

引用

International conference on Professional Communication (IPCC)

作者： V.J. Vance Communications Department Oregon Institute of Technology Klamath Falls OR USA

visual communication is a subject area rich for exploration and discovery. A multi-perspective approach to learning about the various media that is inherent in modern society allows us to better understand what we see and what it means. In essence, it provides a framework within which visual literacy can be attained. This paper introduces some fundamental considerations of visual communication and encourages a multi-perspective approach to exploring visual media with the goal of persuading readers to recognize the importance of developing visual literacy.

关键词： visual communication Streaming media image analysis Eyes Graphics Drives Modems TV Humans Production

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Blind image watermarking via derivation and quantization of robust semi-global statistics

Blind image watermarking via derivation and quantization of ...

引用

International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： M. Kıvanç Mıhçak Ramarathnam Venkatesan Beckman Institute and ECE Dept University of Illinois Urbana IL USA Microsoft Research Limited Redmond WA USA

We introduce a new approach for blind image watermarking: We derive robust semi-global features in wavelet domain and quantize them in order to embed the watermark. Quantization of statistics is carried out by adding scaled pseudo-random sequences that are visually unnoticeable. Our algorithm exhibits increased robustness against various attacks and it withstands standard benchmark attacks of wider trange than earlier methods (e.g., Stirmark, random bending etc.) and modifications such as compression, provided they do not cause too severe visual distortions.

关键词： Robustness Radio access networks Watermarking Cryptography

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Orientation consistency based-feature extraction

Orientation consistency based-feature extraction

引用

IEEE Region 10 International conference TENCON

作者： Daisheng Luo Qingchuan Tao Jianzhong Long Xiaohong Wu College of Elecbroiiic Infomiation Sichuan University Chengdu China

ISBN: (纸本)0780374908

Feature extraction is one of the key techniques in automatic fingerprint identification. Today, most feature extractions are based on the structure analysis of fingerprint ridges and valleys. The structure analysis depends on the accuracy of image segmentation. image segmentation is one of the most difficult techniques in image processing. Therefore, the accuracy and correctness of the feature extraction are often not reliable. For this reason, we propose a method for feature extraction in fingerprint identification. In this method, the intensity gradient vector image is first generated using the expanded Prewitt operator. Then the orientation consistency of the gradient vector image is calculated. The feature points of the fingerprints are extracted from the orientation consistency by classification. This method is fast, simple and accurate.

关键词： Feature extraction Fingerprint recognition image matching Bridges Noise reduction Bifurcation

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Error resilient image coding and smart post-processing error concealment for wireless image transmission

Error resilient image coding and smart post-processing error...

引用

International conference on Acoustics, Speech, and Signal processing (ICASSP)

作者： Keng-Khai Ong Yew-San Lee Chen-Yi Lee National Chiao Tung University Taiwan

ISBN: (纸本)0780374029

In recent years, there has been a huge growth in the areas of multimedia and wireless communications. image transmission through bandwidth limited and high bit error rate wireless channel requires both compression and error resilient capabilities. We propose an error resilient image coding and smart error concealment schemes for DCT-based [1] image compression, such as JPEG and MPEG standards. It can successfully prevent error propagation between the transmitted data blocks with little overhead. In addition, we present a novel post-processing error concealment scheme, called Smart-IDCT (SIDCT). It tries to retain error free low frequency DCT information and discarding highly suspicious high frequency information. Then, we can retrieve low-resolution information instead of totally corrupted image block during the decoding process. The required computation power is much less than conventional error detection and correction schemes. Simulation results show that the overhead of ERIC is about 5% compared to the JPEG sequential DCT-based mode without restart marker. With the SIDCT post-processing, it can achieve excellent image quality (PSNR=31.78dB).

关键词： Artificial neural networks Wireless communication Power amplifiers Memory management

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A synchronization method for real time surround display using clustered systems 02

A synchronization method for real time surround display usin...

引用

10th International conference of Multimedia

作者： Choi, Jeong-Dan Byun, Ki-Jong Jang, Byung-Tae Hwang, Chi-Jeong VR Research Dept. ETRI 161 Kajeong-dong Yuseong-gu Taejon Korea Republic of Image Processing Lab. CNU 220 Gung-dong Yuseong-gu Taejon Korea Republic of

ISBN: (纸本)9781581136203

This note describes a synchronization method for use of the multi-channel display and the associated clustered PC rendering systems, within multi user Virtual Reality online games with real time frame rates. It provides a real time surround game display to render the very complex 3D graphics objects. Our system is composed of Multi-channel Distributor, and visualization Clients. visual client system can be connected to multi monitors or projectors. With Multi-channel distributor, an application can be configured, at runtime, to span any number of visuals to makeup a complete surround and to manage the user game event. All visualization clients produced are frame synchronized to ensure visual uniformity. However, tightly synchronized PC cluster may cause a draw back in its rendering speed. So, we propose a dual scene graph management method to adaptively synchronize. One scene graph is conventionally organizes and control the rendering of its constituent objects. And the other is spatially grouping on the geometric objects found at the edge of two adjacent channels between of the clustered PCs and or not. In this paper describes the method of a construction dual-scene graph based clustered rendering system for scalable display in order to generate high-resolution images at real time frame rates. And also we are planning to develop a multi-projector display system which calibrates itself automatically regardless its shape of display surface and which provides a user with a seamless game display. Our results are well suited for surround 3D game displays such as multi-projector or multi-monitor running on a PC cluster.

关键词： Display devices

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A skin detector based on neural network

A skin detector based on neural network

引用

International conference on communications, Circuits and Systems (ICCCAS)

作者： Li Chen Jiliu Zhou Zhiming Liu Wei Chen Guoqing Xiong College of Electronic Information Sichuan University Chengdu China Telecommunication Station West china Medical School Sichuan University Chengdu China

A large body of human image processing techniques use skin detection as a first step for subsequent feature extraction. The objective of this work is to provide an efficient tool to detect human skin in color images. Well-established methods of color modeling, such as histograms and Gaussian mixture models have enabled the construction of suitably accurate skin detectors. However such techniques are not ideal for use in various environments. We describe a method of skin detection using a back propagation neural network, and show considerable good performance for a large variety of color images. We also introduce genetic algorithms into the weights and biases optimization of the neural network. The paper focuses on the novel approach to design a neural network based skin detector, which is later used to retrieve skin-like homogeneous regions in color face images.

关键词： Skin Detectors Neural networks Humans Color Biological system modeling Face detection image processing Feature extraction Histograms

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Contrast based quantization and rate control for wavelet coded images

Contrast based quantization and rate control for wavelet cod...

引用

IEEE International conference on image processing

作者： D.M. Chandler S.S. Hemami School of Computer and Electrical Engineering Cornell University Ithaca NY USA

A visually-optimal quantization and rate-control strategy based on results of recent contrast sensitivity and suprathreshold summation experiments is proposed. At suprathreshold contrasts, masked detection thresholds for wavelet subband quantization distortions were approximately equal for scale-3, 4, and 5 distortions; approximately 52% greater for scale-2 distortions; and approximately 84% greater for scale-1 distortions. Based on a suprathreshold error-pooling model, contrasts for individual subbands are selected to match these contrast ratios, and are adjusted to account for changes in relative sensitivity at suprathreshold contrasts. Quantization step sizes are then computed from the adjusted base contrasts. A target contrast is estimated from the desired rate, and rate control is performed by adjusting this contrast until the rate is met. images compressed with the proposed algorithm show improved visual quality at low bit rates.

关键词： Quantization image coding Distortion measurement Size measurement Wavelet analysis Bit rate Psychology Discrete wavelet transforms Humans visual system

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Distance metric for motion vector histograms based on human perceptual characteristics

Distance metric for motion vector histograms based on human ...

引用

IEEE International conference on image processing

作者： T. Yoshida Department of Communications and Integrated Systems Tokyo Institute of Technology Tokyo Japan

This paper proposes a distance metric for motion vector histograms. Of a number of existing distance metrics for histograms, the weighted quadratic form distance is known to be efficient because of its flexibility. In order for the distance to be efficient, however, a suitable selection for its weighting matrix is necessary. Proposed in this paper is a determination technique for the weighting matrix which can reflect human perceptual characteristics for motion similarity. Experimental results have confirmed that the proposed technique is useful as a similarity measure in video retrieval.

关键词： Histograms Humans image databases Motion measurement Anthropometry Video coding Microcomputers Information retrieval image retrieval Spatial databases

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