This paper introduces a virtual Dunhuang mural restoration system in collaborative network environment. It describes the style of Dunhuang mural, analyzes the reasons of mural spoilage, and presents the necessity to develop a collaborative mural restoration GroupWare. It describes the components and the workflow of mural restoration in detail, solves some key technologies in the system. In the end, it introduces the system architecture, and presents the system interface and some restored results.

Image segmentation has been the subject of considerable research activity over the last three decades. This paper proposes an algorithm for color image segmentation by region growing combined with the image enhancement based on the Bezier model. Using Bezier curve model has a direct impact on the quality of the image, and will enhance the boundary differences between the objects and their background making the image segmentation task easier. The segmentation starts from a seed in the form of 3*3 image blocks to avoid the noise point. It grows up the region by adding adjacent pixels that are satisfied with the homogeneous criteria with the seed point, expand point and the growing region respectively. Using the perceptual color clustering, color images is quantized and the similar colors are classified based on NBS color distance. The experimental results illuminate that the algorithm the paper proposed is effective.

With the availability of broadband Internet Access, Networked Virtual Environment (NVE) is ready for deployment over the Internet. Of existing NVE communication architectures, the most suitable one for Inter-networked VE is clientlserver architecture with multi-server. However under this architecture each client connects with only one server: so when a client migrates from one server to another, it should disconnect with the previous server and make connection to another server. Because of the Internet' s inherent latency problem, there will be an abrupt appearance in other clients' view due to it. To avoid this abrupt appearance, the paper bright out a new NVE's communication architecture in which each client connects with other server (s) in advance according to prediction. The new architecture was adopted by Tourism Expo' 2003 of Zhejiang Province, and achieved a great success.

Cooperative work is becoming a comprehensive and effective product design method, and the application of multimedia and multiple design modes has made cooperative design system more natural and easier to use. By now, most of the cooperative design is specific-task oriented and carried out through a specific multimedia cooperative design tool. But with the improved requirements of agility and design efficiency of product design, more and more attention is paid to the design platform that supports multiple design tasks using multiple cooperative design tools. Based on the analysis of a comprehensive cooperative design model, this paper presents a framework supporting multimedia and multiple design modes. This framework is based on an open hierarchy, which is able to embed multiple cooperative design tools. And it also provides a series of cooperative design services. Then several key technologies of the framework are discussed: the intelligent agent based cooperative tool configuration technique, synchronous/asynchronous design mode control, consistency control of the cooperative design object, and at last the extensible multimedia organization model. Finally, this paper will present an application example of the framework, and then will evaluate the framework and draw a conclusion.

Chinese civilization has accumulated many heritage sites over thousands of years. Dunhuang Mogao Cave, located in Gansu province, is typical. Well preserved to date, the caves contain more than 555 grottoes, 2, 000 painted statues, and 5, 000 square meters of wall paintings. However, they face serious damage from many different factors. Scientists and artists have worked for a long time on how to preserve and restore the murals' colors, but still have not found satisfactory methods. Discovering how to use advanced computer techniques to preserve, restore, and reuse Dunhuang fresco art information is a very interesting and complex task. In our project, we integrate many techniques, such as image processing, informaton retrieval, knowledge representation, and intelligence reasoning, to deal with these problems.