For Handwritten Multi-functional Video Conferencing, Multimedia Data Acquisition, Reproduction And Safe Use Of Research To Achieve

The multimedia videoconference system has provided the comprehensive platform for the different users sharing multiple messages, real-time cooperative work and CSCW, has become the best communications tools when the government and the enterprise have to work or the family member has to study. The contents of this paper are a part of the study 'R&D of real time communication technology supported tablet in network videoconference' . It is an international cooperation fund project(the project serial number: 2002GH07) that supported by the Yunnan Province Science and Technology Office. The research of the paper is based on Microsoft's NetMeeting SDK. The paper has realized the digital pen multi-purpose video conference system multimedia data acquisition, the regeneration and the safe use subsystem, thus has consummated the video conference system application function.The paper has referred to this system related white table function and in the earlier period research foundation, has studied the contents of multimedia data processing in the project, has designed the multi-purpose video conference multimedia data (including audio, video, hand-written work page and so on) gathering system, has realized in this videoconference system the multimedia data preservation. The paper unifies this system unique personalization writing by digital pen multi-purpose characteristic, designs and realizes including the audio, the video, the hand-written work page multimedia conference data reappearance. These functions expand the videoconference system application scope. Based on the Hash algorithm (MD5 encryption scheme), the paper realizes digital pen the multipurpose videoconference multimedia data the safe encryption. So they can provide the technical guarantee for this videoconference system multimedia data safe use, can enhance digital pen the multipurpose videoconference result the security and the practical value.This system had taken tests many times in the many kinds of network environments and the effect is satisfied. For the next further practical application, the test has built a good foundation.