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检索条件"任意字段=Conference on Visual Communications and Image Processing 2001"

共 4134 条记录，以下是311-320 订阅

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Developing an integrated video analysis system

Developing an integrated video analysis system

引用

conference on visual communications and image processing 2001

作者： Mittal, A Cheong, LF Natl Univ Singapore Dept Elect & Comp Engn Vision & Image Proc Lab Singapore 117576 Singapore

ISBN: (纸本)0819439886

Matching the similarity between two units of data occurs as a frequent task in video or image analysis. The parameters of matching techniques are level of abstraction of features, distance measures and normalization of features, if supported, or else the method of relatively weighing the features. Most multimedia analysis systems employ only low level features with distance measures similar to Euclidean distance, with no method to automatically generate the weights of the features and thus are ineffective in replenishing suitable matches to the user's demands. We argue for shifting the burden of mapping the feature space with relevant categories from the user to the multimedia analysis system. In this paper, a Bayesian Framework is presented where the evaluation of the parameters of classification and especially the relevancy of each feature with respect to each class is performed automatically. The probabilistic framework is extended to work well for generalized multi-modal distribution of a particular class over the feature space. Theoretical foundation is developed to provide simultaneously existing multiple views to an image or a video sequence. The low-level features can be synthesized with intelligent association to furnish high-level features, which could be more meaningful to the user. The significance of this work is presented by comparing with a system which employs a unsophisticated approach similar to common systems where feature vector of query image and feature vector of template image are compared by means of weighted Euclidean distance. The superiority of our approach is presented over the database consisting of 300 video sequences comprising of diverse video classes.

关键词： high level categories Bayesian Networks meaningful feature evaluation mapping partially specified querying similarity measures matching techniques multiple label assignment

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ROTATIONAL BASED REWRITABLE DATA HIDING IN JPEG

ROTATIONAL BASED REWRITABLE DATA HIDING IN JPEG

引用

IEEE International conference on visual communications and image processing (VCIP)

作者： Ong, SimYing Wong, KokSheik Univ Malaya Fac Comp Sci & Informat Technol Kuala Lumpur Malaysia

ISBN: (纸本)9781479902880

This paper proposes a novel rotational method on AC coefficient pairs to embed data into a JPEG compressed image. The purpose is to improve the carrier capacity of [1] while maintaing its original feature in controlling quality degradation. The proposed method exploits two properties in the quantized AC coefficients, namely, large magnitude and short run of zeros for low frequency subbands, and vice versa. The coefficients are first grouped into pairs and then rotated to the left or right directions to create distinctive states, where each can be utilized to represent external data. The AC coefficients are not modified and no additional AC coefficients are introduced for data embedding. However, preprocessing is needed so that all blocks satisfy the properties assumed to ensure correct data extraction and image recovery. The proposed method is rewritable because the host image can be re-utilized without causing further distortion. Experiments were conducted to verify the basic performance of the proposed method. On average, the proposed method is able to embed up to similar to 9318 bits in the test images of quality factor 80.

关键词： Zero run value rotation rewritable data hiding JPEG compressed image DCT

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Predictive and direct fractal quantization of the wavelet packet domain

Predictive and direct fractal quantization of the wavelet pa...

引用

visual communications and image processing 1998 conference

作者： Reichl, M Uhl, A Salzburg Univ Res Inst Softwaretechnol A-5020 Salzburg Austria

In this work we discuss several approaches fur designing fractal quantizers in the context of hybrid wavelet-fractal image compression algorithms. Moreover different subband-structures are compared concerning their su... 详细信息

ISBN: (纸本)0819427497

关键词： wavelet image compression fractal image compression hybrid algorithms wavelet packets

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QUALITY ASSESSMENT OF 3D SYNTHESIZED VIEWS WITH DEPTH MAP DISTORTION

QUALITY ASSESSMENT OF 3D SYNTHESIZED VIEWS WITH DEPTH MAP DI...

引用

IEEE International conference on visual communications and image processing (VCIP)

作者： Tsai, Chang-Ting Hang, Hsueh-Ming Natl Chiao Tung Univ Dept Elect Engn Hsinchu Taiwan

ISBN: (纸本)9781479902880

Most existing 3D image quality metrics use 2D image quality assessment (IQA) models to predict the 3D subjective quality. But in a free viewpoint television (FTV) system, the depth map errors often produce object shifting or ghost artifacts on the synthesized pictures due to the use of Depth image Based Rendering (DIBR) technique. These artifacts are very different from the ordinary 2D distortions such as blur, Gaussian noise, and compression errors. We thus propose a new 3D quality metric to evaluate the quality of stereo images that may contain artifacts introduced by the rendering process due to depth map errors. We first eliminate the consistent pixel shifts inside an object before the usual 2D metric is applied. The experimental results show that the proposed method enhances the correlation of the objective quality score to the 3D subjective scores.

关键词： 3D image quality assessment 3D artifacts in view synthesis depth map induced errors

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A Novel Edge-Preserving Mesh-Based Method for image Scaling

A Novel Edge-Preserving Mesh-Based Method for Image Scaling

引用

IEEE Pacific Rim conference on communications, Computers and Signal processing (PACRIM)

作者： Mostafavian, Seyedali Adams, Michael D. Univ Victoria Dept Elect & Comp Engn Victoria BC V8P 5C2 Canada

ISBN: (纸本)9781538607008

In this paper, we present a novel image scaling method that employs a mesh model that explicitly represents discontinuities in the image. Our method effectively addresses the problem of preserving the sharpness of edges, which has always been a challenge, during image enlargement. We use a constrained Delaunay triangulation to generate the model and an approximating function that is continuous everywhere except across the image edges (i.e., discontinuities). The model is then rasterized using a subdivision-based technique. visual comparisons and quantitative measures show that our method can greatly reduce the blurring artifacts that can arise during image enlargement and produce images that look more pleasant to human observers, compared to the well-known bilinear and bicubic methods.

关键词： image edge detection Interpolation image reconstruction Face Mesh generation visualization Computational modeling

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A New Framework for image Impulse Noise Removal with Postprocessing

A New Framework for Image Impulse Noise Removal with Postpro...

引用

IEEE visual communications and image processing conference

作者： Chen, Qiqiang Wan, Yi Lanzhou Univ Inst Signals & Informat Proc 222 South Tianshui Rd Lanzhou Peoples R China

ISBN: (纸本)9781479961399

Impulse noise is commonly encountered during image transmission and many methods have been proposed to remove it. Although it is now possible to recover the true image reasonably well, even under severe noise (90% pixel contamination), essentially all methods published so far follow the standard procedure of noisy pixel detection/classification and then noisy pixel value reconstruction, without any further processing. In this paper we show an interesting empirical discovery that the traditionally denoised image tends to have the estimation error with a Laplacian distribution, which makes it possible to add a postprocessing stage to denoise the traditionally obtained result with this new type of noise. We propose a practical algorithm within this new framework and experimental results show that superior results can be obtained over previously published methods.

关键词： Impulse noise image denoising noise removal Laplacian distribution Gaussian distribution

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引用

3rd International conference on communications and Signal processing (ICCSP)

作者： Ruikar, Jayesh D. Sinha, Ashoke K. Chaudhury, S. Natl Inst Technol Dept Elect Engn Silchar 788010 Assam India

ISBN: (纸本)9781479933587

image processing and analyzing images of the operation is to always ask about their quality, whether the quality is increased or decreased? image Quality Assessment techniques is required for prediction of quality of the image. Human visual System (HVS) has been widely incorporated in estimating the quality of the image, as human is the ultimate observer of the image. In this work, Author investigated the SSIM index depends upon correlation based filtering like Gaussian low pass filter, averaging filter, Circular averaging filter and motion filter, also mean square error and peak signal to noise ratio is used.

关键词： Human visual System Single Scale Structural Similarity Index image Quality Assessment

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Fractal motion compensation

Fractal motion compensation

引用

visual communications and image processing 1998 conference

作者： Pommer, A Hufnagl, C Uhl, A Salzburg Univ Res Inst Softwaretechnol A-5020 Salzburg Austria

In this work we apply techniques originating from classical fractal still-image coding to block-matching motion compensation algorithms for digital video compression. Especially the method of adapting the gray-values ... 详细信息

ISBN: (纸本)0819427497

关键词： motion compensation fractal image compression video coding

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image processing assisted voltage overscaling for energy efficient IC realization of motion estimation

Image processing assisted voltage overscaling for energy eff...

引用

conference on visual communications and image processing 2008

作者： Dani, Rajat Zhang, Tong Woods, John W. Rensselaer Polytech Inst ECSE Dept Troy NY 12181 USA

ISBN: (纸本)9780819469946

This paper presents an energy efficient VLSI architecture for motion estimation using image processing assisted voltage overscaling (VOS). Motion estimation is the most computationally expensive block inside any video encoder, typically consuming 40-60% of the total power. This work focuses on using VOS to reduce power consumption at the expense of marginal loss of visual quality. Some image processing techniques are used to assist VOS so that a better trade-off between power and visual quality can be achieved. The design is demonstrated using full search and three step search algorithms. Simulation results in 65mn CMOS technology show that the proposed technique can save up to 30% power at the cost of 0.5dB loss of PSNR.

关键词： video coding motion estimation low power

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Retina Model Inspired image Quality Assessment

Retina Model Inspired Image Quality Assessment

引用

IEEE International conference on visual communications and image processing (VCIP)

作者： Zhai, Guangtao Kaup, Andre Wang, Jia Yang, Xiaokang Shanghai Jiao Tong Univ Inst Image Comm & Infor Proc Shanghai 200240 Peoples R China Univ Erlangen Nurnberg Chair Multimedia Commun & Signal Proc D-91058 Erlangen Germany

ISBN: (纸本)9781479902880

We proposed in this paper a retina model based approach for image quality assessment. The retinal model is consisted of an optical modulation transfer module and an adaptive low-pass filtering module. We treat the model as a black box and design the adaptive filer using an information theoretical approach. Since the information rate of visual signals is far beyond the processing power of the human visual system, there must be an effective data reduction stage in human visual brain. Therefore, the underlying assumption for the retina model is that the retina reduces the data amount of the visual scene while retaining as much useful information as possible. For full reference image quality assessment, the original and distorted images pass through the retinal filter before some kind of distance is calculated between the images. Retina filtering can serve as a general preprocessing stage for most existing image quality metrics. We show in this paper that retina model based MSE/PSNR, though being straightforward, has already state of the art performance on several image quality databases.

关键词： image Quality assessment Human visual System Retinal Model Mean Squared Error Peak Signal to Noise Ratio

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