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Progressive video transmission for packet lossy channels exploiting feedback and unequal erasure protection

Progressive video transmission for packet lossy channels exp...

引用

IEEE International conference on image processing

作者： T. Stockhammer Institute for Communications Engineering (LNT) Munich University of Technology Munich Germany

In this work we present a video transmission system for packet lossy channels based on the progressive texture video coding (PTVC) algorithm. A posteriori video rate control on the progressively coded messages is simplified significantly as for rate adaptation only the later part of this message can be truncated. This property is used by an appropriate unequal erasure protection (UXP) scheme which allows us - in combination with the progressively coded messages - to transmit very efficiently over packet erasure channels like the Internet. An appropriate rate allocation scheme based on dynamic programming is introduced. Additionally, a source-channel coding system exploiting network feedback is presented. Dependency on feedback delay is studied. Information between source encoder, channel encoder and network is exchanged and exploited in a cooperative way. The investigated systems show significant gains for different video sequences and different channel erasure rates when compared to sophisticated standard approaches.

关键词： Propagation losses Feedback Protection Video codecs Video coding Internet Forward error correction Error correction codes Communication system control Dynamic programming

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Error control for wireless progressive video transmission

Error control for wireless progressive video transmission

引用

IEEE International conference on image processing

作者： T. Stockhammer H. Jenkac C. Weiss Institute for Communications Engineering (LNT) Munich University of Technology Munich Germany

We present and compare several video transmission systems with various feedback and coding strategies for wireless real-time transmission. A channel coding system based on high-memory convolutional codes (CCs) is deployed which aims at delaying the first error within a progressively coded data frame as far as possible. A low-rate feedback channel is introduced to communicate the number of error-free received bits to the transmitter or to request additional redundancy. Thus, drift problems are avoided, since video encoder and decoder predict from identical reference frames. Several video communication systems based on forward error correction (FEC) and automatic repeat request (ARQ) methods are presented and compared. Experimental results are provided. The benefits of the proposed combination of unequal error protection (UEP) or ARQ systems with progressively coded sources and network feedback are highlighted.

关键词： Error correction Feedback Automatic repeat request Forward error correction Real time systems Channel coding Convolutional codes Carbon capture and storage Delay Transmitters

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On three-dimensional layout of pyramid networks

On three-dimensional layout of pyramid networks

引用

IEEE Asia-Pacific conference on Circuits and Systems

作者： T. Yamada N. Fujii S. Ueno Department of Communications and Integrated Systems Graduate School of Science and Engineering Tokyo Institute of Technology Tokyo Japan

Pyramid networks are well-known as suitable structures for parallel computations such as image processing. This paper shows a practical 3D VLSI layout of the N-vertex pyramid network with volume O(N) and wire-length O(/sup 3//spl radic/N). Since the known best lower bounds for the volume and wire-length of a 3D layout for an N-vertex pyramid network are /spl Omega/(N) and /spl Omega/(/sup 3//spl radic/N/log N), respectively, the volume of our layout is optimal, and the wire-length of our layout is close to the optimal.

关键词： Circuits Very large scale integration Computer networks Concurrent computing Joining processes image processing Costs Volume measurement

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MAP-based post processing of video sequences using 3-D Huber-Markov random field model

MAP-based post processing of video sequences using 3-D Huber...

引用

IEEE International conference on Multimedia and Expo (ICME)

作者： Zhen Li E.J. Delp Video and Image Processing Laboratory (VIPER) Purdue Univ. West Lafayette IN USA

The block DCT (BDCT) is by far one of the most popular transforms used in image and video coding. However, it introduces a noticeable blocking artifact at low data rates. A great deal of work has been done to remove the artifact with information extracted from the spatial and frequency domains. In this paper we address the video sequence restoration problem as a 3D Huber-Markov random field model and derive the temporal extension to traditional maximum a posteriori (MAP)-based methods. Two schemes, we call temporal MAP (TMAP) and motion compensated TMAP (MC-TMAP) respectively, are presented. We test our methods on MPEG-2 compressed sequences and evaluate their performances with traditional MAP restoration. Experimental results confirm that our schemes can significantly improve the visual quality of the reconstructed sequences.

关键词： Video sequences image restoration Discrete cosine transforms Video coding Data mining Frequency domain analysis Testing Transform coding Performance evaluation image reconstruction

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Robust bandlimited watermarking with trellis coded modulation

Robust bandlimited watermarking with trellis coded modulatio...

引用

IEEE International conference on image processing

作者： V. Thilak A. Nosratinia Multimedia Communications Laboratory Electrical Engineering University of Texas Dallas Richardson TX USA

Digital watermarking is equivalent to bandlimited, power-limited digital communication. The power limit is due to the requirement of imperceptible watermarks, and has long been recognized. The bandwidth limit is due to the lowpass spectrum of images and possible lowpass attacks (malicious or unintentional). This is related to the concept of channel capacity, and has only recently been addressed in the context of watermarking. To achieve high reliability without loss of watermark data rates, we propose an adaptation of trellis coded modulation (TCM). Our method is applicable to a wide class of watermarking algorithms. The objective is to maintain the data rate while improving reliability of watermark detection, in terms of bit error rates (BER). Alternatively, higher data rates can be achieved while maintaining watermark BER. We conduct experiments for blind as well as. informed detection. Simulation results show significant improvement compared to conventional methods over a wide-range of channel (attack) signal-to-noise ratios.

关键词： Robustness Watermarking Modulation coding Bit error rate Data mining Constellation diagram Bandwidth Maintenance Interference Channel coding

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Scrambling-based watermarking for MPEG-4 video

Scrambling-based watermarking for MPEG-4 video

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European Signal processing conference (EUSIPCO)

作者： Boris Vassaux Philippe Nguyen Severine Baudry Patrick Bas Jean-Marc Chassery Boris Vassaux Patrick Bas Jean-Marc Chassery - Laboratoire Saint Martin d'Hercs Cedex France Philippe Nguyen Severine Baudry - Thalès Communication - Département TSI Genevilliers France

The MPEG-4 video standard is nowadays more and more used for video compression, and for applications such as video editing, internet or wireless video communications. However the manipulation of video objects, which is one of the most interesting functionality of MPEG-4, makes many watermarking methods inefficient, especially methods which embed the digital signature in the full spatial domain. This paper presents a new video watermarking technique resisting to MPEG-4 video object manipulation. This so-called scrambling technique allows to adapt any classical spread spectrum watermarking scheme operating in the spatial domain to the MPEG-4 requirements concerning VO manipulation. Thanks to the usage of scrambling and multi-layer embedding, an efficient algorithm for video watermarking is then proposed. Our results show that this algorithm is robust to Video Object manipulations and lossy compression.

关键词： Transform coding Streaming media Abstracts Force Multimedia communication image coding Watermarking

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An effective content-based visual image retrieval system

An effective content-based visual image retrieval system

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IEEE Annual International Computer Software and Applications conference (COMPSAC)

作者： Xiuqi Li Shu-Ching Chen Mei-Ling Shyu B. Furht NSF/FAU Multimedia Laboratory Florida Atlantic University Boca Raton FL USA Distributed Multimedia Information System Laboratory School of Computer Science Florida International University Miami FL USA Department of Electrical and Computer Engineering University of Miami Coral Gables FL USA

An effective content-based visual image retrieval system is presented. This system consists of two main components: visual content extraction and indexing, and query engine. Each image in the image database is represented by its visual features: color and spatial information. The system uses a color label histogram with only thirteen bins to extract the color information from an image in the image database. A unique unsupervised segmentation algorithm combined with the wavelet technique generates the spatial feature of an image automatically. The resulting feature vectors are relatively low in dimensions compared to those in other systems. The query engine employs a color filter and a spatial filter to dramatically reduce the search range. As a result, queue processing is speeded up. The experimental results demonstrate that our system is capable of retrieving images that belong to the same category.

关键词： image retrieval Content based retrieval Feature extraction Data mining Indexing Engines Histograms Shape Multimedia systems image databases

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Design and implementation of a real-time pan-tilt visual tracking system

Design and implementation of a real-time pan-tilt visual tra...

引用

IEEE conference on Control Technology and Applications (CCTA)

作者： Kung-Ye Chen Ming-Yang Cheng Mi-Ching Tsai National Cheng Kung University Tainan Taiwan National Cheng Kung University Tainan TW Nat. Cheng Kung Univ. Tainan Taiwan

Due to the increasing need in the security and surveillance system, the problem of automatically tracking a moving target by a visual servo system is a research topic which deserves more investigation. Whether a visual tracking system can successfully track a moving target in real-time or not, it relies heavily on the performance of motion estimation technique. The region-based matching method and motion energy method are two of the existing popular motion estimation techniques. These two methods have been modified to meet the requirement of real-time execution in this study. In addition, a prototype real-time pan-tilt visual tracking system is developed as a test platform to investigate the performance of both methods. Experimental results indicate that both methods exhibit satisfactory performances.

关键词： Real time systems Target tracking Prototypes Cameras Servomechanisms Motion detection Surveillance Motion estimation image processing Charge coupled devices

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Dissimilarity measures in color spaces

引用

International conference on Pattern Recognition

作者： D. Coquin P. Bolon B. Ionescu CNRS-GDR Annecy-le-Vieux France

A problem of both theoretical and practical importance in image processing is to compare two color images, taking into account the eventual diversities due to translation, or color variations. The aim of the paper is to study the behavior of dissimilarity measures in different color spaces. Five color spaces (RGB, HSI, HSV, CIELab, CIELuv) are studied. Properties of the dissimilarity measures are compared in terms of sensitivity to radiometric variations, spatial shifts and shape distortions. We compare the results with those obtained by subjective testing.

关键词： Extraterrestrial measurements Color Distortion measurement Shape measurement image processing Radiometry Computer displays Humans visual system Degradation

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Towards autonomous vision self-calibration for soccer robots

Towards autonomous vision self-calibration for soccer robots

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： G. Mayer H. Utz G. Kraetzschmar University of Ulm (EBS) Ulm Germany

The ability to autonomously adapt to variations in the environmental conditions is a very useful feature for mobile robots. Of particular interest in robotic soccer are self-calibrating vision systems that automatically adapt to local lighting conditions. The paper presents a method for autonomous calibration of a color classificator used for color blob-based image segmentation and landmark and object recognition. The experimental results demonstrate significantly improved robustness of visual processing.

关键词： Robot vision systems image edge detection Colored noise Calibration Mobile robots Machine vision Humans Color Histograms Signal to noise ratio

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