國立臺灣大學電機工程學系暨研究所貝蘇章2006-07-252018-07-062006-07-252018-07-062001-07-31http://ntur.lib.ntu.edu.tw//handle/246246/7770隨著影像資料的漸趨龐大，一個有效的影像分析方法 變得日益重要。而現階段，由於大部分的影像資料都 以MPEG 的方式壓縮儲存，所以一個直接在壓縮資料 做的影像分析也引起廣泛的研究興趣。本文提供一個 新的快速影像分析方法，以直接萃取影像資料中的 Macroblock 資料加以簡單分析，可以快速找到換景、 閃光燈及標題等較關鍵的影像片段，以便利將來使用 者的瀏覽與搜尋。Efficient indexing methods are required to handle the rapidly increasing amount of visual information within video databases. Video analysis that partitions the video into clips or extracts interesting frames is an important preprocessing step for video indexing. In this paper, we develop a novel method for video analysis using the macroblock (MB) type information of MPEG compressed video bitstreams. This method exploits the comparison operations performed in the motion estimation procedure, which results in specific characteristics of the MB type information when scene changes occur or some special effects are applied. Only a simple analysis on MB types of frames is needed to achieve very fast scene change, gradual transition, flashlight, and caption detection. The advantages of this novel approach are its direct extraction from the MPEG bitstreams after VLC decoding, very low complexity analysis, frame-based detection accuracy and high sensitivity.application/pdf165134 bytesapplication/pdfzh-TW國立臺灣大學電機工程學系暨研究所MPEG影像分析換景Compressed Domain Video AnalysisVideo IndexingScene ChangeFlashlight and Caption Detectionreporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/7770/1/892213E002159.pdf