基于內(nèi)容的視頻片段檢索技術(shù)研究
[Abstract]:In recent years, with the increasing enrichment of video information resources, retrieval of interested video fragments from a large number of video data has become the focus of video retrieval research. It is expected that in the near future, like text retrieval, users will submit the video content of the query to the system, and the system will automatically return the results that meet the needs of the query. In this context, content-based video retrieval emerges as the times require. It integrates the knowledge of image processing, pattern recognition, computer vision, image understanding and so on, and has a broad application prospect. In this paper, the video of advertising, racket sports and news video are taken as the research objects, and the retrieval methods of these three kinds of video fragments are mainly studied. In this paper, a new method of video segment retrieval for advertisement is proposed. Based on the definition of the similar shot set of the query segment shot, the method of calculating the number of similar shots corresponding to the two fragments one by one is given to eliminate the pseudo-similar fragments, and then the matching function of the fragments is defined. The sliding lens window is used to automatically segment several similar fragments from the continuous video stream, and the similar shot set is mapped to the similar lens matrix, and the factors affecting the similarity degree of the segment are calculated by using the properties of the matrix. The sorting model of similar fragments is established. Compared with other methods with the same function, the retrieval speed is improved on the premise of higher retrieval accuracy. Based on visual features, motion features and audio features, a Rally video retrieval method for racket sports competition video is proposed. A method of automatically selecting the reference key frame of Global View Shots class based on motion feature and main color feature is proposed in order to divide the shot into Global View Shots class and Non-Global View Shots class to recognize the important audio type of shot. The audio information is applied to the lens class, and the corresponding rules for detecting interesting events are established. By using the playback Rally fragment and the Rally wonderful degree model, the Rally wonderful fragments which accord with the majority of people's psychology are retrieved from the racket game. This paper presents a method of news video segment retrieval based on visual features and semantic information. In this paper, a method of text detection for news video topic subtitles is proposed, and then a method for news video story segmentation through topic caption text and mute segment is discussed. The similarity model of news segments is established based on the semantic information obtained from low-level visual features and subject subtitles. The relevant feedback technique is applied to retrieve the news story fragments that are most suitable for users' needs. A content-based video segment retrieval experimental platform is designed and implemented, and the performance of the above method is verified.
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2007
【分類號】:TP391.3
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