Perfect reconstruction filters are the key of the subband coding systems in which original images are split into several bands of different frequencies. Until now, in many cases, the size of images are assumed to be infinite, so as to avoid issues regarding the irregularity around the borders of images. However, in reality, any images are of finite size and have borders. This paper presents a new procedure of getting perfect reconstruction filters for finite size images by modifying parts of coefficients of conventional filters such as SSKF and Daubechies'filters, in cases not all the pixels are available around the borders of the images.

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In erroneous networks, conventional inter frame coding largely degradates the quality by errors, and the degradation is propagated temporally and spatially. We proposed a video coding system by dynamic updating of reference pictures accoding to the acknowledgement signals from the decoder. As the encoder refers the frame that the decoder received, the propagation by errors can be minimized. In this paper, we define methods using two kind of backward signals (ACK/NACK), and compare with conventional systems by a computer simulation. As a result, the ACK's method is effective in the more erroneous case, and the NACK's method is effective in the les erroneous case.

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We have developed a stereo vision system for safety support of freeway driving. The system processes images captured by two cameras and accurately calculates the distance between own vehicle and forward one in real time regardless of the direction and amount of sunlight and the effects of shadows and road signs. The system employs two effective methods. One is a vehicle recognition method unaffected by changes in the amount of sunlight and applicable to various types of vehicles based on long horizontal edges. The other method is reduction to a large amount of the calculation of stereo matching by searching and corresponding the first dimensional characteristic. To evaluate the performance of our methods, we incorporated it into an video processing system ISHTAR. We confirmed that the test results were within the allowable range for calculation errors and that the system worked with sufficient accuracy.

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We have proposed a new method to detect image orientation with mathematical morphology, which is one of non-linear processing methods. In the new method, opening with one-dimensional structure along each orientation axe detects image directionality, following detection of oriented edges in images. Region widening is done to the detected orientation signal, changing widening parameters according to the length of the orientation. Decision process, in which output values are determined in logical comparison with other orientation signals, makes the results flawless. The new method has been applied to a MUSE decoder and proved to be effective. Moreover, adapt processing with the results of orientation detection has enabled a MUSE decoder to decode MUSE signal with less artifacts than a conventional one.

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This report proposes a new real-time method that estimates the posture of a human from a thermal image acquired by an infrared camera regardless of background and lighting conditions. Distance transformation is performed for the human body area extracted from the thresholded thermal image so that the center of gravity of body is calculated. After the orientation of the upper half of the body is obtained from calculating the moment of inertia, significant points such as the top of the head, the tips of the hands and foot are heuristically located. In addition, the elbow and knee positions are estimated from the siginificant points using a genetic algorithm based learning procedure. It turns out the proposed method works effectively in the Virtual Kabuki System.

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Recently high-speed and multimedia networks, such as ATM Networks, have been installed in major companies and Universities. This paper presents the configuration method of a remote lecture system over ATM-Networks, which are composed of local campus networks and the backbone long-haul network. In this system, students can communicate by real time audio visual circuits with a lecturer by multimedia ATM networking. In addition, this new system operates based on the reservation time. Then, the networking method among the terminals and the lecture server, the circuit establishment server over the On-Line University network are also described.

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Videophone euable parson to do face-to-face communication between distant places. Traditional evaluation method measure degradation degree of decoded picture quality. In this report, new evaluation based on degree of transmission of nonverbal language, which is important for face-to-face communication, is studied. Test image sequences are generated and used by experiment of new evaluation method. Motions of upper part of body as nonverbal languages are effective for new evaluation method.

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In this paper, problems of on WWW interactive services and one of their solutions are discussed. First, information flows are analyzed from the point of information circulations, Particularly, some types of interactive services are studied. Secondly, a discussion on authoring of interactive services are followed by a GUI-based authoring tool which is not required high-level programmingskills.

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Virtual Museum Island offers on-demand electronic art gallery information service. Visitors can walkthrough this 3D CG Virtual Museum Island and enjoy the high-definition still pictures of over 200 works of Van Gogh at any time with a simple operation of a 3D control device. Here is how this works. First, its interactive walkthrough software engine generates the high-speed, high-resolution motion pictures which will be encoded by TOSHIBA MPEG2 real-time encoder. Then TOSHIBA ATM switcher transfers these encoded pictures to distant exhibition sites via NTT high-speed broadband backbone networks.

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This report mentions the computer integrated manufacturing system based on the unified database and network in the factory which produces high-technological electric equipments and systems. By giving an actual example, it shows you a model to build the "Computer Integraed Manufacturing system (CIM)" which covers all the production activity from design to manufacturing. In addition to the background and concept of the CIM, the outline of system functions is described. It presents not only an intruduction of the system development, but also a methodology to realize the CIM for plants in Japan.

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