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Time-space local feature extraction method based on linear dynamic system

A space-time partial and dynamic system technology, applied to computer parts, instruments, characters and pattern recognition, etc., can solve problems such as difficult to deal with the movement of the lens itself

Inactive Publication Date: 2014-12-10
INST OF AUTOMATION CHINESE ACAD OF SCI
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  • Description
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AI Technical Summary

Problems solved by technology

The optical flow histogram focuses on the motion information between frames in the feature, but this method is difficult to deal with the motion of the lens itself

Method used

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  • Time-space local feature extraction method based on linear dynamic system
  • Time-space local feature extraction method based on linear dynamic system
  • Time-space local feature extraction method based on linear dynamic system

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Embodiment Construction

[0016] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0017] figure 1 A flow chart of a method for extracting spatio-temporal local features based on a linear dynamic system provided by the present invention, such as figure 1 As shown, the method includes the following steps:

[0018] Step 1: collect video data files to be processed;

[0019] Step 2: For the video data file to be processed, extract a three-dimensional space-time local feature with a size of N×N×L;

[0020] Said step 2 further comprises the following steps:

[0021] Step 21, calculating interest points and optical flow fields of each frame of video images;

[0022] Wherein, the interest points may be local sparse interest points such as SIFT, MSER, etc., or dense interest points obtained by sampling at eq...

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Abstract

The invention discloses a time-space local feature extraction method based on a linear dynamic system. The method comprises the following steps: 1, collecting a video data file to be processed; 2, extracting the three-dimensional time-space local features of the video data file to be processed; 3, unfolding each three-dimensional time-space local feature along space dimension to obtain a two-dimensional time-space local feature; 4, learning to obtain the model parameter of the linear dynamic system by taking the two-dimension time-space local feature Y as the output of the linear dynamic system, wherein the model parameter of the linear dynamic system is taken as a describer of the two-dimensional time-space local feature Y. The extracted describer can be used for expressing the static apparent information and motion information of the time-space local feature at the same time, and the method can be widely applied to the businesses of video content retrieval, sensitive video detection and filtering, intelligent video monitoring and the like.

Description

technical field [0001] The invention relates to the technical field of image processing and computer application, in particular to a method for extracting temporal and spatial local features based on a linear dynamic system. Background technique [0002] With the rapid development of social economy and science and technology, video has been widely used in various places. For example, monitoring systems for security are installed in banks, airports, residential areas and other areas, and a large amount of monitoring video data is generated every day; For another example, there are a large number of video programs stored on the Internet, and they are constantly increasing at a high speed every moment. How to quickly and accurately retrieve the content we expect from such a large amount of video data is a practical problem with important research value and huge application value. The effective solution of this problem will play an important role in the in-depth development of r...

Claims

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Application Information

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IPC IPC(8): G06K9/66G06K9/46
Inventor 罗冠胡卫明
Owner INST OF AUTOMATION CHINESE ACAD OF SCI
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