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检索条件"任意字段=Visual Communications and Image Processing 2004"

共 107 条记录，以下是11-20 订阅

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Possibilistic clustering based MR Brain image segmentation with accurate initialization

Possibilistic clustering based MR Brain image segmentation w...

引用

Conference on visual communications and image processing 2004

作者： Liao, QM Deng, YY Dou, WB Su, RA Bloyet, D Tsing Hua Univ Dept Elect Engn Beijing 100084 Peoples R China

ISBN: (纸本)0819452114

Magnetic resonance image analysis by computer is useful to aid diagnosis of malady. We present in this paper a automatic segmentation method for principal brain tissues. It is based on the possibilistic clustering approach, which is an improved fuzzy c-means clustering method. In order to improve the efficiency of clustering process, the initial value problem is discussed and solved by combining with a histogram analysis method. Our method can automatically determine number of classes to cluster and the initial values for each class. It has been tested on a set of forty MR brain images with or without the presence of tumor. The experimental results showed that it is simple, rapid and robust to segment the principal brain tissues.

关键词： image segmentation Brain Magnetic resonance imaging Neuroimaging Tissues Tumors Fourier transforms image processing image analysis Magnetism

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Pixel- and compressed-domain color matching techniques for video mosaic applications

Pixel- and compressed-domain color matching techniques for v...

引用

Conference on visual communications and image processing 2004

作者： Lee, MS Shen, MY Kuo, CCJ Univ So Calif Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)0819452114

Several color matching algorithms are proposed to merge two or more video inputs of smaller sizes in to one single video output of a larger size with a wider field of view for the video mosaic application. The main challenge is to remove apparent seam lines between image boundaries. All developed algorithms share the same basic idea with different implementation details. That is, color differences between input images are first compensated using either histogram equalization or polynomial-based contrast stretching techniques. Then, a linear filtering technique is adopted to remove seam lines between image boundaries. The algorithms are developed in both the pixel and the DCT domains. The compressed-domain processing is attractive since it reduces the computational complexity. It is shown by experimental results that the color matching problem can be solved satisfactorily even in the compressed domain.

关键词： color matching video mosaic compressed domain processing DCT-domain processing

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Layered unequal loss protection for progressive image transmission over packet loss channels

Layered unequal loss protection for progressive image transm...

引用

Conference on visual communications and image processing 2004

作者： Cai, JF Li, XJ Chen, CW Nanyang Technol Univ Sch Comp Engn Ctr Multimedia & Network Technol Singapore 639798 Singapore

ISBN: (纸本)0819452114

In the past, many schemes have been proposed for progressive image transmission using unequal error protection (UEP) or unequal loss protection (ULP). However, most existing UEP/ULP schemes do not consider the minimum image quality requirement and usually have high computation complexity. In this paper, we propose a layered ULP (L-ULP) scheme for progressive image transmission over packet loss channels, which is able to solve the mentioned problems of existing ULP schemes by smartly choosing the layers. The numerical results show that the proposed L-ULP scheme is quite promising for fast image transmission over packet loss networks.

关键词： unequal loss protection progressive image transmission packet loss

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Improving non-linear up-scaling by adapting to the local edge orientation

Improving non-linear up-scaling by adapting to the local edg...

引用

Conference on visual communications and image processing 2004

作者： Tegenbosch, JAP Hofman, PT Bosma, MK Philips Res Labs Dept Video Proc & Visual Percept NL-5656 AA Eindhoven Netherlands

ISBN: (纸本)0819452114

Currently., the demand for larger screens and high-definition (HD) television-sets is rapidly increasing. To display standard definition (SD) video on high-resolution television sets. spatial up-scaling techniques are necessary to increase the resolution. One technique that makes this possible is linear up-scaling complemented by non-linear sharpness enhancement, such as Luminance Transient Improvement (LTI).(1-3) In this paper, three different two-dimensional (2D) implementations of the LTI algorithm are analyzed in terms of image quality and computational complexity. Results show that taking the local edge orientation into account is essential for obtaining high image quality. Furthermore. it is shown that the process of operating perpendicular to an edge can be replaced by a simplified alternative with a minimal loss of image quality.

关键词： video processing scaling sharpness enhancement LTI high-definition

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Multispectral image compression for high quality color reproduction using JPEG2000

Multispectral image compression for high quality color repro...

引用

Conference on visual communications and image processing 2004

作者： Mase, R Kawasaki, Y Murakami, Y Obi, T Yamaguchi, M Ohyama, N Tokyo Inst Technol Imaging Sci & Engn Lab Yokohama Kanagawa Japan

ISBN: (纸本)0819452114

Color reproduction systems using multispectral imaging techniques make it possible to accurately reproduce the color of the original object under various viewing illuminants. In this paper, a multispectral image compression method for high fidelity color reproduction is proposed in consideration of color degradation. In the proposed method, a spectral transform and a nonlinear quantization designed to reduce colorimetric error are combined with the discrete wavelet transform in JPEG2000. Through the experiments using some 16-band multispectral images, it is confirmed that the proposed method reduces the average and the maximum color differences in L(*)a(*)b(*) color space in comparison with the conventional methods.

关键词： multispectral image color reproduction JPEG2000 WKLT adaptive preprocessing

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Adaptive multiscale image denoising using neural networks

Adaptive multiscale image denoising using neural networks

引用

International Conference on Signal processing and communications (SPCOM)

作者： Srinivasan, M Annadurai, S Anna Univ Govt Coll Technol Coimbatore Tamil Nadu India

ISBN: (纸本)0780386744

An image is often corrupted by additive gaussian noise during its acquisition and transmission. Denoising has to be performed on these images to retain the signal and to suppress the noise. Denoising can be performed by various methods like thresholding, filtering etc. But these methods did not consider the local space scale information of the image. Here a new type of neural network is constructed for noise reduction, where the space scale information of the image is considered. This method gives a good numerical results and also better visual effects. Keywords: Denoising,Discrete Wavelet Transform, Continuous soft thresholding, Least Mean Square rule.

关键词： denoising discrete wavelet transform continuous soft thresholding Least mean square rule

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Turbo Trellis Coded Modulation with two typical mapping strategies of 16QAM in image transmission

Turbo Trellis Coded Modulation with two typical mapping stra...

引用

Conference on visual communications and image processing 2004

作者： Bai, ZQ Yuan, DF Inha Univ Grad Sch Informat Technol & Telecommun Telecommun Engn Lab Inchon South Korea

ISBN: (纸本)0819452114

In this paper, based on the characteristics of Turbo Codes and Trellis Coded Modulation (TCM), an improved method Turbo Trellis Coded Modulation (Turbo TCM) with two different mapping strategies is presented over AWGN (add white gauss noise) channels. The performance of different mapping strategies of Turbo TCM in AWGN channels for image transmission is analyzed and investigated. Furthermore, taking 16QAM modulation of Turbo TCM as the example, two different signal constellations are compared and computer simulation results are showed.

关键词： turbo codes Turbo Trellis Coded Modulation 16QAM UP BP

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Model-based quality enhancement of scalable video

Model-based quality enhancement of scalable video

引用

Conference on visual communications and image processing 2004

作者： Feideropoulou, G Pesquet-Popescu, B Telecom Paris Signal & Image Proc Dept Paris France

ISBN: (纸本)0819452114

Scalable video coding via motion-compensated spatio-temporal wavelet decompositions has gained a great interest in transmission over heterogeneous networks due to the flexibility of the resulting bitstream to accomodate various network conditions as well as user capabilities and demands. Meanwhile, the adaptation of the video bitstream to the available bandwidth can lead to discarding the finest detail subbands during the transmission. The loss of these subbands would result in a low quality, oversmoothed reconstructed sequence. In this paper, we present a statistical spatio-temporal model between the wavelet coefficients and we show its efficiency in the prediction of the high frequency subbands and in the quality enhancement of the scalable video.

关键词： scalability wavelets stochastic modelling video quality

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Post-processing of compressed video using a unified metric for digital video processing

Post-processing of compressed video using a unified metric f...

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Conference on visual communications and image processing 2004

作者： Boroczky, L Yang, YB Philips Res USA Briarcliff Manor NY 10510 USA

ISBN: (纸本)0819452114

In this paper we propose a novel, post-processing system for compressed video sources. The proposed system explores the interaction between artifact reduction and sharpness/resolution enhancement to achieve optimal video quality for compressed (e.g. MPEG-2) sources. It is based on the Unified Metric for Digital Video processing (UMDVP), which adaptively controls the post-processing algorithms according to the coding characteristics of the decoded video. The experiments carried out on several MPEG-2 encoded video sequences have shown significant improvement in picture quality compared to a system without the UMDVP control and to a system that did not exploit the interaction between artifact reduction and video enhancement. The UMDVP as well the proposed post-processing system can be easily adapted for different coding standard, such as MPEG-4, H.26x.

关键词： post-processing artifact reduction sharpness enhancement resolution enhancement MPEG-2

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Watershed segmentation and region merging

Watershed segmentation and region merging

引用

Conference on visual communications and image processing 2004

作者： Pires, RLVPM De Smet, P Philips, W State Univ Ghent Dept Telecommun & Informat Proc B-9000 Ghent Belgium

ISBN: (纸本)0819452114

The aim of this paper is to present a methodology to generate a partition of an image and a hierarchical region merging scheme to improve the meaningfulness of the segmentation, by reducing excessive object fragmentation. The segmentation method is based on the watershed transform applied to the image gradient magnitude. Prior to the actual segmentation, the image is smoothed to decrease the amount of detail detected by the watershed transform. To further improve the segmentation result, we use an iterative region merging process that uses a graph to represent the image partitions. In this process the most similar pair of adjacent regions is sequentially merged according to a predefined similarity metric. We investigate the use of a combined region merging criterion that takes into account both the intensity similarity and the contrast at the boundary of two adjacent regions. Results obtained illustrate the good combined performance of this segmentation and merging methods and the usefulness of the combined similarity function.

关键词： image segmentation watershed region merging adjacency graph similarity criteria

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