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检索条件"任意字段=Visual Communications and Image Processing 2006"

共 106 条记录，以下是21-30 订阅

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A splitting algorithm for touched particle based on distance map and particle shape information - art. no. 60771R

A splitting algorithm for touched particle based on distance...

引用

Conferenceon visual communications and image processing 2006

作者： Wang, WX Chongqing Univ Posts & Telecommun Dept Comp Sci & Technol Chongqing 400065 Peoples R China

ISBN: (纸本)0819461172

This paper presents how to split touching particles. The algorithm mainly consists of two sub-algorithms;they are splitting based on concavities of boundaries and splitting based on object skeleton histogram. It first traces particle boundaries based on discontinuities, then splits touching parts of particles based on shape information, where no gray information can be used, by using morphological mathematics method (e.g. distance map) combining particle shape information (information is classified by using fuzzy mathematics). After that, the algorithm split the remaining touching parts by using the information of concavities of particle boundaries The algorithm can automatically delineate particles not only on a simple image (a few particles touching) and also on a complex image (many particles touching together). The algorithm has been tested in a laboratory;it works well for various particle images.

关键词： blood cell image image segmentation splitting edges decompose

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Robustness of a perceptually lossless medical image coder: Interpolation

Robustness of a perceptually lossless medical image coder: I...

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International Symposium on Intelligent Signal processing and communications

作者： Chai, Shan Wu, David Tan, Damian M. Wu, Hong Ren RMIT Univ Sch Elect & Comp Engn Melbourne Vic 3001 Australia

ISBN: (纸本)9780780397323

Perceptually lossless medical image coding is an alternative for compressing medical images. It provides a solution to the challenge of delivering clinically critical information in the shortest time possible. In this paper, an investigation of the robustness of the perceptually lossless image coder is carried out by applying bilinear, biquadratic and bicubic standard and centered B-spline interpolation filters. In order to evaluate the visual performance, a subjective assessment was conducted consisting or 30 medical images and 6 image processing experts. Here, the perceptually lossless medical image coder was compared to the state-of-the-art JPEG-LS compliant LOCO and NLOCO image coders. Current results have shown that overall, there were no perceivable differences or statistical significance when the medical images were enlarged by a factor of 2.

关键词： Interpolation

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Depth map compression for unstructured lumigraph rendering

Depth map compression for unstructured lumigraph rendering

引用

Conferenceon visual communications and image processing 2006

作者： Fecker, U Guenegues, A Scholz, I Kaup, A Univ Erlangen Nurnberg Chair Multimedia Commun & Signal Proc Cauerstr 7 D-91058 Erlangen Germany

ISBN: (纸本)0819461172

image-based rendering techniques require capturing an object or scene from many viewpoints. Often, depth maps are used in addition to the original images for rendering new views for novel viewpoints not coinciding with one of the original camera positions. Due to the high amount of data, efficient compression is necessary. When the data is stored or transmitted, it is not only desirable to compress the image data but also the depth information. In this paper, the case of sequences recorded with a single, hand-held camera is investigated. These sequences are used for unstructured lumigraph rendering. In addition, the case of multi-view video sequences is analyzed. For both cases, depth maps are compressed using H.264/AVC, and the achievable data rates are studied. For the case of unstructured lumigraph rendering, the effect of depth map compression on the quality of rendered images is analyzed in a second step.

关键词： image-based rendering light field lumigraph depth map image compression video coding

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Distributed sender-driven video streaming

Distributed sender-driven video streaming

引用

Conferenceon visual communications and image processing 2006

作者： Chakareski, J Frossard, P Ecole Polytech Fed Lausanne Signal Proc Inst LTS4 CH-1015 Lausanne Switzerland

ISBN: (纸本)0819461172

A system for sender-driven video streaming from multiple servers to a single receiver is considered in this paper. The receiver monitors incoming packets on each network path and returns, to the senders, estimates of the available bandwidth on all the network paths. The senders in turn employ this information to compute transmission schedules for packets belonging to the video stream sent to the receiver. An optimization framework is proposed that enables the senders to compute their transmission schedules in a distributed way, and yet to dynamically coordinate them over time such that the resulting video quality at the receiver is maximized. Experimental results demonstrate that the proposed streaming framework provides superior performance over distortion-agnostic transmission schemes that perform proportional packet scheduling based only on the available network bandwidths.

关键词： Video Receivers Computer programming Distortion Data modeling Multimedia Video coding Computing systems Distributed computing Video processing

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Error resilience in network-driven Wyner-Ziv video coding

Error resilience in network-driven Wyner-Ziv video coding

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Conferenceon visual communications and image processing 2006

作者： Liu, LM Sabrià, P Torres, L Delp, EJ Purdue Univ Sch Elect & Comp Engn Videa & Image Proc Labs VIPER W Lafayette IN 47907 USA

ISBN: (纸本)0819461172

Previously we presented a network-driven Wyner-Ziv video coding method, in which the motion vectors are derived at the decoder and sent back to the encoder through a reliable backward channel. In this paper, we consider the scenario when the backward channel is error resilient. We study the performance of error resilient methods for our codec. A symmetrical Reversible Variable Length Code (RVLC) is used to reduce the bandwidth requirement of the backward channel. A hybrid scheme with selective coding is proposed to improve the coding efficiency when transmission delay occurs. The experimental results show that these error resilient methods can consistently improve the video quality at the decoder.

关键词： Wyner-Ziv video coding network-driven motion estimation error resilience reversible variable length code (RVLC)

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Fish tracking by combining motion based segmentation and particle filtering

Fish tracking by combining motion based segmentation and par...

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Conferenceon visual communications and image processing 2006

作者： Bichot, E Mascarilla, L Courtellemont, P Univ La Rochelle Lab Informat Image Interact Av Michel Crepeau F-17042 La Rochelle France

ISBN: (纸本)0819461172

In this paper, we suggest a new importance sampling scheme to improve a particle filtering based tracking process. This scheme relies on exploitation of motion segmentation. More precisely, we propagate hypotheses from particle filtering to blobs of similar motion to target. Hence, search is driven toward regions of interest in the state space and prediction is more accurate. We also propose to exploit segmentation to update target model. Once the moving target has been identified, a representative model is learnt from its spatial support. We refer to this model in the correction step of the tracking process. The importance sampling scheme and the strategy to update target model improve the performance of particle filtering in complex situations of occlusions compared to a simple Bootstrap approach as shown by our experiments on real fish tank sequences.

关键词： particle filtering importance sampling tracking

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Correlation estimation and performance optimization for distributed image compression

Correlation estimation and performance optimization for dist...

引用

Conferenceon visual communications and image processing 2006

作者： He, ZH Cao, L Cheng, H Univ Missouri Dept Elect & Comp Engn Columbia MO 65211 USA

ISBN: (纸本)0819461172

Correlation estimation plays a critical role in resource allocation and rate control for distributed data compression. A Wyner-Ziv encoder for distributed image compression is often considered as a lossy source encoder followed by a lossless Slepian-Wolf encoder. The source encoder consists of spatial transform, quantization, and bit plane extraction. In this work, we find that Gray code, which has been extensively used in digital modulation, is able to significantly improve the correlation between the source data and its side information. Theoretically, we analyze the behavior of Gray code within the context of distributed image compression. Using this theoretical model, we are able to efficiently allocate the bit budget and determine the code rate of the Slepian-Wolf encoder. Our experimental results demonstrate that the Gray code, coupled with accurate correlation estimation and rate control, significantly improves the picture quality, by up to 4 dB, over the existing methods for distributed image compression.

关键词： image compression Binary data Computer programming Video Data compression Video compression Quantization Statistical analysis Video coding Digital modulation

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Perception-based multi-quality image compression for efficient transmission

Perception-based multi-quality image compression for efficie...

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2006 International Symposium on Intelligent Signal processing and communications, ISPACS'06

作者： Rong, Mei Electrical Engineering Department Ryerson University Toronto ON M5B 2K3 Canada

ISBN: (纸本)0780397339

This paper proposes an efficient image compression algorithm based on visual perception. It automatically detects the important regions using saliency maps, then different regions are compressed in different qualities. Several adaptive methods are compared. This algorithm is expected to provide efficient image transmission through band-limited networks. © 2006 IEEE.

关键词： image compression

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Perceptually lossless image coding of digital medical mammograms with arithmetic visual pruning

Perceptually lossless image coding of digital medical mammog...

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International Symposium on Intelligent Signal processing and communications

作者： Wu, David Tan, Damian M. Wu, Hong Ren RMIT Univ Sch Elect & Elect Engn Melbourne Vic 3001 Australia

ISBN: (纸本)9780780397323

A method of encoding digital medical mammograms is presented in this paper. Based on the JPEG2000 coding framework and embedded with an advanced perceptual distortion measure, the proposed coder identifies and removes visually insignificant/irrelevant information, so as to achieve perceptually lossless quality. Compared with the state-of-the-art JPEG compliant LOCO lossless coder and JPEG2000 lossless coder, current results have shown compression ratio gains in bit-rate without any loss of visual fidelity.

关键词： Mammography

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Adaptive in-band motion compensated temporal filtering based on motion mismatch detection in the highpass subbands

Adaptive in-band motion compensated temporal filtering based...

引用

Conferenceon visual communications and image processing 2006

作者： Gao, AY Canagarajah, N Bull, D Univ Bristol Image Commun Grp Ctr Commun Res Merchant Ventrues BldgWoodland Rd Bristol BS8 1UB Avon England

ISBN: (纸本)0819461172

This paper presents an adaptive in-band motion compensated temporal filtering (MCTF) scheme for 3-D wavelet based scalable video coding. The proposed scheme overcomes the problem of visual artifacts due to motion mismatch when motion information of the spatial lowpass subband is inaccurately applied to the highpass subbands in decoding high spatial resolution video. More specifically, the proposed scheme determines if the mismatch energy is beyond an acceptable threshold in the wavelet domain and then adaptively switches between using the motion information from the spatial lowpass and highpass subbands in the MCTF prediction step. As a result, the amount of motion overhead needs to be transmitted is minimized and a good trade-off. between motion information and texture is realized. Experimental results show that the proposed scheme greatly improves the quality of the decoded video at high spatial resolutions while achieving a high coding efficiency. Furthermore, the proposed adaptive scheme requires only modifications when performing MCTF in the highpass subbands, hence the original strength of in-band MCTF for decoding low spatial resolution video is well preserved.

关键词： in-band MCTF wavelet-domain motion mismatch visual artifacts motion-texture trade-off

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