Mpeg-7 Standard-based Video Description And Retrieval

With the rapid development of multimedia and communication technology, a great deal of video data and information has become available. At present, we need to organize and manage video data and information in many fields, such as digital library, military information system, Web information system and video database etc. Compared to traditional text information, video data contains too much information and is hard to describe, so it becomes difficult to find the proper information that we need. In the past, people have done much research on video database, video analysis and information retrieval, but there lacks complete and standardized description of video data, and video information retrieval method based on the standardized description. In this paper, based on the analysis of current video manipulation and retrieval methods, and according to the new framework of the MPEG-7 standard, the author raised a new method to describe and retrieve video content. The main work includes:1. Video content analysis and standardized description: According to the MPEG-7 standard, first, the author analyzed video content, then made standardized description of it. Based on the analysis of video content, this paper gives a model of video content description using the MPEG-7 standard. The model starts from the features of video data, it takes into consideration not only structural features of video including visual and spatio-temporal, but also the need to video information retrieval. The model applies a hierarchical structure.2. Design and implementation of the video content description tool: According to Description Definition Language (DDL), this paper gives a content description tool based on the MPEG-7 standard. The base of the description tool is the description model mentioned in the paper. The tool can automatically extract structural features of video and create the description. Besides, given some necessary information, the tool can also automatically create the description of semantic information. According to the video content description tool, we can build standardized description adapted to video retrieval. The final format of the description uses XML recommended by W3C.3. A mechanism of video indexing as well as its setting up algorithm based on inverted index: In this algorithm, the author designs an efficient index structure that can better contain features of media data contents. This mechanism of video index is based on invert index, which is similar to the one used in traditional document retrieval.4. A rapid retrieval algorithm based on the invert index and its implementation: Based on the comparison to the current XML document index and retrieval algorithms, this paper give the rapid retrieval algorithm based on XML document. In the end, the author lists some results of the experiments that compares some current XML document retrieval algorithms to the algorithms given in this paper. These results prove the availability and efficiency of the algorithm.In a word, based on the method of standardized description, this paper builds a video database and a complete retrieval mechanism based on video contents.