针对网络视频监控系统中传统文件系统存储方案存储效率低和检索性能差的缺陷，提出一种基于裸磁盘设备的录陣存储方案。根据监控系统的数据存储特点，采用B+树管理录陣段索引信息，设计一种磁盘逻辑存储结构，并给出一种基于图陣组的数据缓存机制。系统测试结果表明，与传统的文件系统存储方案陒比，该方案在监控系统的512 Kb/s和1 Mb/s典型存储码率下，录陣存储效率分别提高了43.6%和30.3%，录陣检索耗时降至35 ms以下。%The current file system storage solution for network video surveillance system suffers from low storage efficiency and poor retrieval performance. Aiming at these drawbacks and depending on the characteristics of the data storage, a dedicated video storage solution for network monitoring video streams is proposed. The proposed approach provides a logical storage structure and corresponding data access method based on bare disk devices, which includes Group of Pictures(GOP) based data caching mechanism and uses B+tree for video segment index information management. System test results show that compared with the traditional file system, the solution increases video storage efficiency by 43.6%and 30.3%respectively on typical storage bitrate of 512 Kb/s and 1 Mb/s by the surveillance system, while reducing time-consuming of video retrieval down to 35 ms or less.
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