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Retrieval method and retrieval system of video and audio monitoring information

A monitoring information and retrieval system technology, applied in the field of monitoring video and audio, can solve the problem of low retrieval efficiency, achieve query and evidence collection, shorten retrieval time, and save time

Active Publication Date: 2012-06-27
BEIJING ZHONGDUN SECURITY TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, this retrieval method fails to make full use of the absolute time information in the surveillance video and audio, so the retrieval efficiency is not high

Method used

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  • Retrieval method and retrieval system of video and audio monitoring information
  • Retrieval method and retrieval system of video and audio monitoring information

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Embodiment Construction

[0050]The basic idea of ​​the present invention is: make full use of the absolute time information collected on-site in monitoring video and audio, establish index files in the process of video and audio playback or forward positioning; use the established index files to perform backward positioning; On the basis of positioning, pseudo-absolute time information is generated for each frame in the frame buffer, and then frame-level positioning is performed to achieve two-way, fast and efficient retrieval using only absolute time information.

[0051] The following will be combined with figure 2 The technical solutions in the embodiments of the present invention are clearly and completely described.

[0052] figure 2 It is a flowchart of a retrieval method for retrieving video and audio monitoring information provided by the present invention. refer to figure 2 , the retrieval method for retrieving video and audio monitoring information provided by the present invention com...

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Abstract

The invention discloses a retrieval method and retrieval system of video and audio monitoring information. The retrieval method comprises the following steps of: obtaining a time point when an event to be retrieved occurs; comparing the time point to be retrieved with the current closest absolute time point in a video and audio code stream, if the time point to be retrieved is later than the current closest absolute time point, carrying out forward positioning, and simultaneously generating an index file; if the time point to be retrieved is earlier than the current closest absolute time point, carrying out backward positioning; and obtaining the closest absolute time point earlier than the time point to be retrieved through the forward positioning and the backward positioning; and further carrying out frame-level positioning in the obtained absolute time point and the next absolute time point, thus obtaining the video and audio monitoring information at the time point to be retrieved. The retrieval method takes full advantage of the absolute time information in video and audio files, and can realize the two-way, fast and high-precision completion of the retrieval operation.

Description

technical field [0001] The invention belongs to the technical field of monitoring video and audio, and in particular relates to a retrieval method and a retrieval system for monitoring video and audio information. Background technique [0002] The video and audio monitoring system occupies an important position in the construction of social security prevention and control system. The maturity and progress of security prevention technology has positive significance for ensuring national security and building a harmonious society. [0003] Under the modern monitoring concept of "high-fidelity video and audio coding faithful to the scene" as the core idea, it is necessary to transmit and store the absolute time information when the event occurs together with the video and audio compression coding data through a special syntax. This is convenient for retrieval, audio and video synchronization, and multi-channel video synchronization, and can also avoid destroying the original co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 陈朝武费宝顶高磊李鹏飞赵炫倪璟唐胜男
Owner BEIJING ZHONGDUN SECURITY TECH DEV
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