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首页> 外文会议>Moratuwa Engineering Research Conference >RepoZip: A technique for lossless compression of document collections
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RepoZip: A technique for lossless compression of document collections

机译：repozip：文档收集无损压缩技术

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摘要

Many computer systems; especially in corporations, contain large amount of documents such as letters, reports and presentations. Many such documents are present in several versions. Such data needs to be synchronized with branch offices and mobile devices, often over slow and expensive connections. However, as many documents are stored in an already compressed format, it is difficult to compress them further by exploiting the hidden redundancies. We present a novel approach named RepoZip which improves the compression of an existing compression algorithm over a document collection, by exploiting the inter-document meta-data and content-level redundancies. It concentrates on compressing OOXML documents that have been constructed through the archival of a hierarchy of meta-data files and PDF documents which include deflated content streams. Therefore, the RepoZip approach achieves larger compression gains over OOXML document collections or PDF document collections by exploiting usually undetected meta-data level similarities.
机译：许多计算机系统;特别是在公司中，包含大量文件，如字母，报告和演示。许多这些文件存在于几个版本中。这些数据需要与分支机构和移动设备同步，通常在缓慢和昂贵的连接上。但是，由于许多文档以已经压缩的格式存储，因此很难通过利用隐藏的冗余来进一步压缩它们。我们通过利用文档间质量数据和内容级冗余，提出了一种名为Repozip的新建方法，该方法通过文档收集来改进现有压缩算法的压缩。它专注于压缩已通过元数据文件的层次结构和PDF文档构建的oOxml文档，包括缩小的内容流。因此，通过利用通常未检测到的元数据级别相似性​​，返回方法通过OOXML文档集合或PDF文档集合实现了更大的压缩。

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