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International conference on image processing (ICIP'99)

作者： Vahedian, Abedin Frater, Michael R. Arnold, John F. Univ of New South Wales Canberra

In the real world, we commonly receive information simultaneously through two or more senses, with the brain fusing this data to produce a single coherent message. Lip-reading is one example of this phenomenon. Laboratory studies, on the other hand, often measure the response to a stimulus by a single sense and extrapolate these results to predict real-world behaviour. In this paper, we show that semantics have a significant impact on viewers' sensitivity to the quality of a video sequence for spatially separated parts of the sequence and, more importantly, that this difference in sensitivity can be changed by the presence of an audio signal. This result is important for any testing of subjects' responses to visual material. One example is the subjective assessment of the quality of video in an audio-visual communications system (such as television or video conferencing).

关键词： image quality

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Multi-chip neuromorphic motion processing

Multi-chip neuromorphic motion processing

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20th Anniversary conference on Advanced Research in VLSI

作者： Higgins, CM Koch, C CALTECH Div Biol Pasadena CA 91125 USA

ISBN: (纸本)0769500560

We describe a multi-chip CMOS VLSI visual motion processing system which combines analog circuitry with an asynchronous digital interchip communications protocol to allow more complex motion processing than is possible with all the circuitry in the focal plane. The two basic VLSI building blocks are a sender chip which incorporates a 2D imager array and transmits the position of moving spatial edges, and a receiver chip which computes a 2D optical flow vector field from the edge information. The elementary two-chip motion processing system consisting of a single sender and receiver is first characterized Subsequently, two three-chip motion processing systems are described. The first such system uses two sender chips to compute the presence of motion only at a particular stereoscopic disparity. The second such system uses two receivers to simultaneously compute a linear and polar topographic mapping of the image plane, resulting in information about image translation, rotation, and expansion. These three-chip systems demonstrate the modularity and flexibility of the multi-chip neuromorphic approach.

关键词： Stereo image processing

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visual communications, Past and Future

Visual Communications, Past and Future

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Final Program and Proceedings: IS and T's 52nd Annual conference

作者： Roetling, Paul G.

People acquire most of their information through their visual system. Moreover, people often quote that "a picture is worth a thousand words" and it is well known that color attracts attention and helps communicate. Nevertheless, most of our documents are primarily black and white text! This talk reviews the history of visual communication, proposing the thesis that technology, both its advantages and its limitations, has distorted our document design and preparation. Technology is now reaching the point where color and illustrations can be included in many documents, and professionally prepared magazines, newspapers, etc regularly do so. The technology still needed for the future is that which will make it as easy to produce a color illustration as it is now to type a paragraph. This development will require both improved man-machine interfaces and teaching the average person new concepts of document design.

关键词： visual communication

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Feedback channel based error compensation method for mobile video communications using H.263 standard

Feedback channel based error compensation method for mobile ...

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International conference on image processing (ICIP'99)

作者： Choi, Byung Sun Chae, Soo Il Ra, Jong Beom Korea Advanced Inst of Science and Technology Taejon Korea Republic of

This study aims at finding an efficient compensation method of transmission errors in low bit-rate mobile communications using the H. 263 video codec. For this aim, we suggest a novel error compensation method in the encoder (or transmitter), that can remove visual quality degradation due to spatio-temporal error propagation by utilizing a feedback channel. In the proposed method, a corrupted group of blocks (GOB) is concealed to avoid annoying artifacts due to the bit-error, and the GOB and its corresponding frame number are reported to the encoder via the feedback channel. Then, the encoder evaluates the negative acknowledgments and reconstructs the spatial and temporal error propagation by using a novel fast redecoding algorithm. The proposed error compensation method is compared with the two existing ones: the reference picture selection method and the error tracking method. Experimental results show that the proposed method is superior to the existing ones in many aspects.

关键词： image communication systems

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Transporting H.320 video conference traffic to the internet

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Proceedings of SPIE - The International Society for Optical Engineering 1999年第II期3653卷 845-853页

作者： Ku, Chin-Fu Ko, Hung-Yu Lin, Jeng-Wei Pan, Yu-Chun Ho, Jan-Ming Chen, Meng-Chang Ko, Ming-Tat Chen, Sao-Jie Academia Sinica Taipei Taiwan

Although H.320 is one of the most popular ITU-T standard for video conference systems, H.323 is receiving wide acceptance in the internet society. In this paper, we study the problem of transporting video conference traffic to and from the internet. Some characteristics of the problem are as follows. For example, H.323 video stream is VBR while H.320 video stream is CBR; H.323 is byte-oriented while H.320 is bit-oriented; audio and video packets are transmitted independently in H.323 while they are multiplexed together in H.320; the probability of packet loss in a H.323 network is much higher than in a H.320 ISDN circuit switching network. In this paper, we present our designs and some preliminary experimental results in dealing with these issues.

关键词： Video conferencing

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Architectural approaches for multimedia processing: (Invited paper) 4th

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4th International ACPC conference on Parallel Computation, ACPC 1999

作者： Panchanathan, Sethuraman Panch Visual Computing and Communications Laboratory Department of Computer Science and Engineering Arizona State University P.O. Box 875406 TempeAZ85287-5406 United States

ISBN: (纸本)3540656413

The recent advances in VLSI technology, high-speed processor designs, Internet/Intranet implementations, broadband networks (ATM and ISDN) and compression standards (JPEG, MPEG, H.261, H.263 and G.273) are leading to the popularity of multimedia applications. Examples include, video over the internet, interactive TV, distance learning, telemedicine, and digital libraries. Multimedia refers to a combination of various media types including text, audio, 2D and 3D graphics, animation, images and video. visual media (image, video and graphics) proliferation in multimedia applications demands high-powered compute engines, large storage devices, and high bandwidth networks for processing, storage, and transport of image/video data. visual media processing poses challenges from several perspectives, specifically from the points of view of real-time implementation and scalability. There has been several approaches to obtain speedups to meet the computing demands in multimedia processing ranging from media processors to special purpose implementations. Note that a variety of parallel processing strategies are adopted in these implementations in order to achieve the required speedups. The objective of this paper to present a summary of the various architectural alternatives that exist for multimedia processing. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Intranets

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A visual search engine for distributed image and video database retrieval applications 3rd

A visual search engine for distributed image and video datab...

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3rd International conference on visual Information Systems, visual 1999

作者： Ohm, Jens-Rainer Bunjamin, F. Liebsch, W. Makai, B. Müller, K. Saberdest, B. Zier, D. Heinrich Hertz Institute for Communications Technology Image Processing Department Einsteinufer 37 BerlinD-10587 Germany

ISBN: (纸本)3540660798

This paper reports about an implementation of a search engine for visual information content, which has been developed in the context of the forthcoming MPEG-7 standard. The system supports similarity-based retrieval of visual (image and video) data along feature axes like color, texture, shape and geometry. The descriptors for these features have been developed in a way such that invariance against common transformations of visual material, e.g. filtering, contrast/color manipulation, resizing etc. is achieved, and that they are fitted to human perception properties. Furthermore, descriptors have been designed that allow a fast, hierarchical search procedure, where the inherent search mechanisms of database systems can be employed. This is important for client-server applications, where pre-selection should be performed at the database side. Database interfaces have been implemented in a platform-independent way based on SQL. The results show that efficient search and retrieval in distributed visual database systems is possible based on a normative feature description such as MPEG-7. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Search engines

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A figure extraction method based on the color and texture contrasts of regions

A figure extraction method based on the color and texture co...

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10th International conference on image Analysis and processing, ICIAP 1999

作者： Tanaka, Shoji Iwadate, Yuichi Inokuchi, Seiji ATR Media Integration and Communications Research Laboratories 2-2 Hikaridai Seika-cho Sorakugun Kyoto 619-0288 Japan Department of Systems and Human Science Osaka University 1-3 Machikaneyama-cho Toyonaka City Osaka 560-8531 Japan

ISBN: (纸本)0769500404

Detecting interesting regions from pictures has become important in order to reduce the computational complexity associated with such time-consuming processes as object recognition. In this paper we assume that figure-ground segmentation of a picture is necessary as the first step towards evaluating the attractiveness of regions. In vision research, it has been found that the V4 cortex in the visual system contributes to figure-ground selectivity. By utilizing this finding, we propose a method for extracting figure regions from a picture based on the color and texture contrasts of regions. This method discriminates regions previously segmented from a picture into figure regions and ground regions by a discrimination function defined with contrast parameters. The contrast parameters include the color difference and the texture difference between a region and its surroundings, as well as the focus of the region. A discrimination function is constructed based on the characteristics of the extracted figures and ground obtained in our experiments. In other experiments on evaluating the accuracy of the proposed method, figure regions selected by human subjects are extracted by the method at the rate of 80% accuracy. © 1999 IEEE.

关键词： Object recognition

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Low delay foveated visual communications over wireless channels

Low delay foveated visual communications over wireless chann...

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IEEE International conference on image processing

作者： Sanghoon Lee A.C. Bovik Young Yong Kim Laboratory for Image and Video Engineering Department of Electrical and Computer Engineering University of Technology Austin TX USA

The great potential of "foveated imaging" lies in the entropy reduction relative to the original image while minimizing the loss of visual information. Utilizing human foveation combined with video compression, as well as communication and human-machine interface techniques, more efficient multimedia services are expected to be provided in the near future. In this paper, we introduce a prototype for foveated visual communications as one of future human interactive multimedia applications, and demonstrate the benefit of the foveation over fading statistics in the downtown area of Austin, Texas. In order to compare the performance with regular video, we use spatial/temporal resolution and source transmission delay as the evaluation criteria.

关键词： Delay visual communication Wireless communication Humans Entropy Video compression Man machine systems Prototypes Fading Statistics

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Suppression of ringing artifacts with an adaptive shrinkage algorithm

Suppression of ringing artifacts with an adaptive shrinkage ...

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IEEE Pacific Rim conference on communications, Computers and Signal processing

作者： Ngai-Fong Law Wan-Chi Siu Degan Feng Department of Electronic and Information Engineering Centre for Multimedia Signal Processing Hong Kong Polytechnic University Hong Kong China

ISBN: (纸本)0780355830

A non-iterative wavelet-based algorithm was proposed to reduce the ringing artifacts associated with a lossy compressed image. The proposed algorithm is based on the fact that increases in magnitude of the quantized wavelet coefficients lead to decreases in visual smoothness. Thus a shrinkage algorithm is applied to maintain visual smoothness. The proposed algorithm is, however, adaptive in nature, in which the amount of shrinkage depends on edge strength, region activity and compression ratio. Experimental results have confirmed that the adaptive algorithm could suppress the ringing artifacts and improve visual smoothness, especially around edges where ringing is severe.

关键词： Signal processing algorithms image coding Wavelet coefficients Quantization Adaptive signal processing Adaptive algorithm Smoothing methods Filters Decoding Wavelet domain

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