Research On The Monitoring And Filtering Of Short Multimedia Message

Due to the development of Internet and multimedia technology, people hope that mobile phones can access to the Internet, and disseminate pleasant multimedia information. Thus, multimedia message service (MMS) appears. The wide spread of MMS is un-avoidable, and the current trend is to support composite multimedia information, such as graphics, images and composite video. The mobile communication has the features such as wide distribution, fast transmission and high efficiency. The multimedia message is quite straightforward and simple. Once it spreads unhealthy messages, their influence will be very serious. Therefore, the security of the Mobile phone short messages is worthy of further investigation. This thesis researches on the monitoring and filtering of short multimedia message, especially the MMS.In detail, the main work of this thesis lies in the following two aspects.First, by utilizing the NMSS simulation development platform of the Nokia Company, a experimental environment MMSC (Multimedia Messaging Service center) is established by simulating the short message service center. MMSC has the capability of sending MMS, which includes text, picture, audio and video etc. The message convey abilities includes: (1) mobile terminals send multimedia messages to other mobile terminals or application software; (2) application software send multimedia messages to other applications and mobile terminals.Second, after reviewing the monitoring and filtering techniques for short messages in the literature, a short message monitoring system based on MMSC is implemented by introducing the image features. The monitoring of short messages is made up of three components, which are text matching, multimedia message and image content analysis. For image based MMS, by matching the extracted image texture features and the pre-defined feature library, some images such as those contain sexual information are filtered.Based on the exploration of technology in inspecting and filtering mobile phone short message content, we can intercept those short messages containing pornography, offensive speech and political sensitive information. They are not consistent with China's nation condition. This thesis is of significant practical use in preventing the harmful information and protecting the purity of communication network.