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检索条件"任意字段=Conference on Visual Communications and Image Processing 2005"

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3D-3D registration of free formed objects using shape and texture

3D-3D registration of free formed objects using shape and te...

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1997 conference on visual communications and image processing

作者： Martins, FCM Shiojiri, H Moura, JMF Carnegie Mellon Univ. (United States) NEC Corp. (Japan)

ISBN: (纸本)0819424358

Automatic generation of textured object models from a sequence of range and color images requires two major tasks: measurement registration and measurement integration. Measurement registration is the estimation of the current position and orientation of the object in 3D space with respect to an arbitrary fixed reference, given the current measurement and the 3D object model under construction. Measurement integration is the updating of the 3D object model using the current registered measurement. In this paper we present an iterative 3D-3D registration technique that uses both texture(1) and shape information available in the 3D object models and the 3D measurements. The proposed technique handles probabilistic models that are potentially incomplete before the measurement integration step. Measurements are acquired via a sensor characterized by a probabilistic sensor model. The object models are constructed automatically without user interaction. Each model is a compact uniform tessellation of 3D space, where each cell of the tessellation represents shape and texture in a probabilistic fashion. Free formed objects are supported and no prior knowledge about the object shape, texture or pose is assumed. Traditional registration methods consider only shape and geometric information. We consider texture information as an additional evidence by defining a generalized intercell distance measure that considers both the relative positioning of cells in space and the texture discrepancy between cells. Experimental results demonstrate the efficiency and robustness of the proposed method. The usefulness of texture in registration is highlighted in a comparison with results obtained considering only geometric information.

关键词： 3D-3D registration 3D pose estimation 3D object modeling textured geometric models range and image sequence processing

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Audio-visual processing for scene change detection 9th

引用

9th International conference on image Analysis and processing, ICIAP 1997

作者： Saraceno, Caterina Leonardi, Riccardo Signals and Communications Lab Dept. Of Electronics for Automation School of Engineering University of Brescia via Branze 38 I-25123 Italy

ISBN: (纸本)3540635084

The organization of video data-bases according to semantic content of data, is a key point in multimedia technologies. In fact, this would allow algorithms such as indexing and retrieval to work more efficiently. As an attempt to extract semantic information, efforts have been devoted in segmenting the video in shots1 and for each shot trying to extract informations such as representative video frame, etc. As a video sequence is constructed from a 2-D projection of a 3-D scene, processing video information only has shown its limitations especially in solving problems such as object identification or object tracking. Further not all information is contained in the video signal and more can be achieved by analyzing the audio signal as well. Information can be obtained from the audio signal either to confirm the results obtained by a video processing unit or to acquire information that cannot be extracted from video (such as presence of music). This paper presents a technique which combines video and audio information for classification and indexing purposes. © Springer-Verlag Berlin Heidelberg 1997.

关键词： Classification (of information)

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Subjective coding of best basis wavelet coefficients for multiresolution analysis

Subjective coding of best basis wavelet coefficients for mul...

引用

International conference on Information, communications and Signal processing

作者： D. Gunawan Electrical Engineering Department University of Indonesia Depok Indonesia

This paper presents a wavelet based image compression algorithm using subjective thresholding and quantization of the wavelet coefficients. subjective compression techniques use the properties of the human visual system (HVS) to eliminate redundant information in an image. By combining the wavelet transform coefficients with psychovisual thresholding and quantization schemes, a coding result of 0.31 bits per pixels has been obtained with weighted PSNR of 39.07 dB.

关键词： Wavelet coefficients Multiresolution analysis Signal resolution image coding Wavelet packets Bit rate Wavelet analysis Binary trees Cost function Quantization

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Estimating blockness distortion for performance evaluation of picture coding algorithms

Estimating blockness distortion for performance evaluation o...

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IEEE Pacific Rim conference on communications, Computers and Signal processing

作者： D.D. Giusto M. Perra Department of Electrical and Computer Engineering University of Cagliari Cagliari Italy

Some of the most significant image quality indexes are reviewed and compared with a new method for blockness distortion evaluation. The paper begins with a brief survey on classical measures based on numerical difference between the original and reconstructed image data (e.g., MSE, SNR and PSNR) and advanced methods aiming at considering the perceptive aspects of image degradation (e.g., Hosaka (1986) plots and other methods based on human visual system properties like information content or perceptual image distortion). After, four innovative methods for blockness distortion measurement are proposed: two based on DCT analysis, and two on differential Sobel operator. Results on standard pictures confirm the efficiency of the proposed measures.

关键词： Distortion measurement Nonlinear distortion PSNR Humans Discrete cosine transforms Signal to noise ratio image reconstruction Degradation visual system Pixel

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Perceptually based subband AMBTC image coder

Perceptually based subband AMBTC image coder

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International conference on Information, communications and Signal processing

作者： Kai-Kuang Ma Lei Huang School of Electrical and Electronic Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0780336763

In this paper, we incorporate the Weber's law into the framework of subband absolute moment block truncation coding (SAMBTC) together with an effective bit-rate control scheme to greatly improve image quality at or around the same bit rates. Or, alternatively it reduces the bit rates further without incurring more noticeable degradation beyond what the SAMBTC has yielded. Experimental results show that the proposed perceptually based SAMBTC distinctly outperforms SAMBTC coded at very low bit rates.

关键词： Bit rate image coding Humans Artificial intelligence image quality Surveillance Biomedical imaging visual system Algorithm design and analysis Compression algorithms

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Low frequency coefficient prediction for image coding

Low frequency coefficient prediction for image coding

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International conference on Information, communications and Signal processing

作者： W.K. Cham M.C.A. Yeung Department of Electronic Engineering Chinese University of Hong Kong New Territories Hong Kong China

It has been shown that about 80% of the DC coefficients of a transformed image can be discarded at the encoder and then restored at the decoder using a DC coefficient restoration (DCCR) algorithm. This approach can improve the compression rate of JPEG by over 10% at low bit rates. We extend the DCCR algorithm not only to restore the DC coefficients but also to predict some of the (0, 1)th and (1, 0)th AC coefficients. The prediction thus allows these AC coefficients to be represented using less bits. Experimental results show that, almost in all cases, images coded using the proposed algorithm have higher PSNR and better visual quality than those coded using only the DCCR.

关键词： Frequency image coding image restoration Transform coding Decoding Radio spectrum management Gold Bit rate PSNR Quantization

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image compression for facial photographs based on wavelet transform

Image compression for facial photographs based on wavelet tr...

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IEEE Pacific Rim conference on communications, Computers and Signal processing

作者： E. Barzykina P. Nasiopoulos R.K. Ward Department of Electrical Engineering University of British Columbia Vancouver BC Canada

This paper presents a wavelet based image compression algorithm specifically tailored for facial photographs. The proposed method dramatically reduces memory requirements for facial image databases. The algorithm makes it possible to reach compression rates of 0.25 to 0.1 bpp without compromising the visual quality of the facial features used for identification purposes. This is made possible by utilizing a novel strategy for quantizing the wavelet coefficients, where the spatial content and the frequency distribution of each input image are combined to produce a quantization scheme which is spatially and frequency dependent and different for each image being processed. The main steps of the algorithm are as follows: detection of more and less important spacial areas in the photograph; discrete wavelet transform; space and frequency dependent quantization customized for a specific frequency distribution of each image; and entropy encoding.

关键词： image coding Quantization Frequency dependence Discrete wavelet transforms Head Facial features Wavelet coefficients Wavelet transforms Colored noise image edge detection

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Corrosion inspection of steel tube inner wall

Corrosion inspection of steel tube inner wall

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IEEE/ASME (AIM) International conference on Advanced Intelligent Mechatronics

作者： T. Tsushima A. Ishii Y. Ochi N. Masaoka N. Matsusue Tomoe Corporation Chuo Tokyo Japan University of Electro-Communications Chofu Tokyo Japan

Summary form only given. In order to maintain the safety of steel tubes which have been used as structural members in large scale structures for a long period, the inner wall of their tubes must be investigated periodically. There are several inspection methods including visual inspection which use an industrial endoscope, and visual inspection is practical to use. However, the methods often involve investigation of a lot of video tapes recorded in the field. The aim of the present study is to automate this visual inspection. We have paid attention to the color of the rust which appears in the corroded wall, and have tried to detect corroded regions by using color image processing. Moreover, we have developed a method to be able to inspect the observing video tape in real time by using a commercial high speed image processing board.

关键词： Corrosion Inspection Steel Color Safety Large-scale systems Endoscopes Pixel image processing Displays

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Architecture and design of a high definition television production switcher 139

Architecture and design of a high definition television prod...

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139th SMPTE Technical conference and Exhibit

作者： Hobson, Edward Takamori, T. Broadcast and Professional Group Sony ElectronicsVince Harradine Broadcast and Professional RD Department Sony Broadcast and Professional Europe United States Image and Sound Communications Company Sony Corporation Atsugi Japan

ISBN: (纸本)9781614829287

In late 1996, the Federal communications Commission ruled the United States would migrate to a digital television broadcasting system. The Commission chose the Grand Alliance transmission scheme and left the picture scanning format to the marketplace. High Definition video, at 1920 times 1080 pixels, interlaced scanning, at a nominal 60 Hertz field rate is one format in the infamous Table 3 of the ATSC document and FCC ruling. This picture format is also well on the way to becoming a universal format. - A new series of digital systems, conforming to the interlaced scanning format of SMPTE 274M- 1995 were recently introduced by Sony. This paper deals with the architecture, enabling technologies, and capabilities of a live and post production vision mixer from this family of equipment. - A modern, digital, high definition vision mixer, and associated digital effects and editing equipment, must provide producers, directors, and the artistic and technical staff employing them with similar capabilities as existing standard definition equipment - the visual effects expected by a sophisticated audience. These requirements are detailed in this paper and the vision mixer described is compared to similar standard definition devices. - The capabilities of the switcher resulted in an architecture for crosspoints, mix effects systems, key and video processing, control and external interfaces. Operational and maintenance aspects are also key factors in an architecture and include considerations for size, mass, power consumption and heat loads. Picture size and shape may change but control room and remote broadcast vehicle designs dictate limitations on these specifications. Trade-offs in capability and architecture are enumerated. - The data rates employed in HDTV (more than 5 times the rate of SMPTE 125M and SMPTE 259M) required additional new technologies, including the development of a series of Application Specific Integrated Circuits which perform the same functions employed

关键词： Mixers (machinery)

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Compression of bank cheque images based on layout knowledge

Compression of bank cheque images based on layout knowledge

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

作者： A.L. Koerich Luan Ling Lee Communications Department School of Electrical and Computer Engineering State University of Campinas Sao Paulo Brazil

In this paper a scheme for bank cheque images compression based on layout knowledge is proposed. The layout structure of the cheques is analyzed and the nonessential parts are located. These parts, viz., the background and the printed information, are eliminated from the original image. The resulting image contains some noise that are eliminated by a filtering operation. The image is enclosed to eliminate some uninformative parts. The final image has only the filled information. The digitized image can be easily reconstructed by restoring the filled information and summing it with background and printed information. The proposed compression scheme is tested by Brazilian bank cheques. Comparisons with other compression schemes, shows that the proposed scheme performs significantly better in terms of the compression efficiency, maintaining the visual quality.

关键词： image coding image reconstruction Knowledge engineering image restoration Testing Credit cards Law Legal factors Information retrieval image color analysis

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