Video retrieval method and device
A video and surveillance video technology, applied in the field of video retrieval methods and devices, can solve problems such as difficult to provide practical and effective retrieval and query information, simple semantic information, etc., achieve rich texture information, useful semantic information, and reduce the amount of search data Effect
Active Publication Date: 2014-02-12
北京汉王智远科技有限公司
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However, for surveillance video, the semantic information obtained by this video analysis method is too simple to provide practical and effective retrieval information.
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[0061] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0062] A video retrieval method of the present invention, such as figure 1 shown, including the following steps:
[0063] Step 1: Perform video text extraction on the input surveillance video.
[0064] Such as figure 2 as shown,
[0065] Step a: Perform text positioning on the input video.
[0066] Locate the text information in the surveillance video in three steps, including:
[0067] 1) Edge detection: text is composed of a series of edge points, using the Sobel operator to extract the edge map of the video image can highlight the text information in the video. The formula for edge extraction is:
[0068] E. x (i,j)=f(i+1,j-1)+2×f(i+1,j)+f(i+1,j+1)-f(i-1,j-1)- 2×f(i-1,j)-f(i-1,j+1) (1)
[0069] E. y (i,j)=f(i-1,j+1)+...
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The invention discloses a video retrieval method and a video retrieval device, and belongs to the field of intelligent monitoring. The method comprises the following steps of: 1, performing video character extraction on the input monitored video; 2, establishing an index unit according to the extracted text information, and adding the index unit into an index table; and 3, searching corresponding video according to the index table. By using the method and the device, character information in the monitored video can be automatically positioned, binarized and identified, and the monitored-video-character-information-based index table is established according to the identification result, so that the monitored video is queried by searching the input query keywords in the index table. The character information in the monitored video can be automatically extracted, so that semantic information richer and more useful than motion information and textural information is acquired. Compared with the traditional artificial query, related video can be automatically queried through a query system, content-based automatic retrieval and query of the monitored video are performed conveniently by a user, and manpower is greatly saved.
Description
technical field [0001] The invention belongs to the field of intelligent monitoring and relates to a video retrieval method and device. Background technique [0002] Video surveillance system is widely used in production management, security and other occasions because of its intuition, convenience and detailed content. The general process of video surveillance system is: one or several cameras are placed in some The transmission network (cable, wireless, optical fiber or Ethernet) is transmitted to the designated monitoring center, and then the media is stored on the storage medium through the storage device. At the same time, other detection devices can be installed on site according to different needs and methods. As an auxiliary device for the monitoring system. [0003] Video surveillance systems have been widely used in various fields, such as transportation, medical care, and social security. Through the video surveillance system, we can not only monitor the monitor...
Claims
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IPC IPC(8): G06F17/30
Inventor 王修飞黄磊刘昌平
Owner 北京汉王智远科技有限公司