Interactive Multimedia for Supporting the Quality of the Production
by George L. Kovács, Géza Haidegger and János Nacsa
In the frame of DIGITAL FACTORY, a Hungarian national R&D project on factory automation, researchers are investigating, developing and applying interactive multimedia technologies to assist design, production and test processes. The project is being undertaken at the CIM (Computer Integrated Manufacturing) Research Laboratory of SZTAKI and in the factory partners sites. Over the past three years, a generalized software environment (IMUTA) and some use cases have been developed.
Within a factory environment, there are several areas in which it is essential that human experts observe, test, control, and understand the details of the production processes. This is the case in both the design and the planning stages, as well as during manufacturing, testing, and verification. The new features of interactive multimedia services raise the level of quality, increase the efficiency, observability and controllability of production, and also allow the customer and the end-user to actively take part in the manufacturing processes.
Since tele-presence and interactive multimedia involve the integration of humans, our research work looks at man-machine interaction, and the definition of VMDs (Virtual Manufacturing Devices) devoted to human entities within the production area. A survey on wearable computers and head-mounted monitors was used to analyse current technology with a view to applying computer platforms on the human body.
Our research focused on a generalized software environment that enables tele-presence operations with interactive multimedia features. The tangible result of this work is called IMUTA: Interactive Multimedia for Tele-presence Applications. In this framework we extended Enterprise Resources with multimedia information and functionality. The Extended Resource model provides a richer and more human-oriented view of resources and processes. For example:
- machining can be observed remotely and in real time; relevant process data, product drawings, technology plans and quality reports can be chosen and shown according to actual requests
- documentation of value products can be extended with multimedia attachments to ensure the customers satisfaction
- customers can observe the production flow of a product.
Significant effort has been devoted to the planning of some pilot demonstrations. We looked for demonstration sites and service-intensive applications that would inspire the hosts and potential customers to implement similar functions. Models were developed for the specific application scenarios in order to derive a generalized framework.
Some of these scenarios are the following:
- reuse of high-value waste workpieces are supported with complex databases, including production and design information, and quality multimedia data; users can reach these entities via an intranet environment
- a wearable computer-based test environment can support customer witness tests
- predefined deviations in the production parameters activate multimedia data acquisition at the necessary machines and operations; the effects of the time delay of the statistical data are solved with a circular multimedia buffer mechanism.
By integrating real-life vision and computer-animated entities, virtual and augmented reality services are offered for specific user applications (see Figure). For that purpose, we developed a distributed simulation and visualization environment for flexible manufacturing systems. It enables users to visualize the results of a simulation of an FMS (flexible manufacturing system) with three-dimensional graphics, or to visualize the actual data of a real system. On the client side, our system uses VRML and Java, so it needs only a Web browser with the appropriate plug-ins to use it. The users can view the scene provided by the simulation system via the Internet, as well as choosing the perspective from which they view it and interacting with it in the simulation phase. The IMUTA concept supports the integration of augmented reality.
These developments will make interactive multimedia a more widely accepted tool not only in simulation and experimentation, but in real factory applications. This will, however, require further organization and management.
George L. Kovács, Géza Haidegger, János Nacsa, SZTAKI, Hungary
Tel: +36 1 279 6140