Text extraction is a key technique in content-based video retrieval as textual information plays an important role in describing the content of image.
文字信息在描述图象内容时起着重要的作用，因此文字提取及识别是基于内容视频检索的关键技术。
In this paper, news story segmentation and topic caption text extraction, as well as content based video browsing and querying, are addressed in detail.
本文详细讲述了新闻故事的分段，主题字幕文本的提取和在此之上的基于内容的视频浏览和查询。
This paper introduces the structure of PDF documents, and shows the procedures for file parsing and text extraction from the parsed content streams.
介绍了PDF的文件结构，在此基础上，给出了PD F文件的解析流程，以及从解析后的内容流中提取文本内容的方法。
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