Pedestrian space-time outline presenting method based on ellipse Fourier decomposition

A Fourier and contour technique, applied in instruments, character and pattern recognition, computer components, etc.

Active Publication Date: 2010-08-11
SHANGHAI FUKONG HUALONG MICROSYST TECH
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Problems solved by technology

[0007] Based on the limitations of the above prior art, the present invention proposes a pedestrian spatio-temporal contour representation method based on elliptic Fourier decomposition, which can automatically extract the contours of pedestrians in surveillance videos, and solve the problem of automatic correspondence of marker points on the contours, and Compress high-dimensional 2D+time Cartesian contour vectors into low-dimensional elliptical Fourier vectors, suitable for gait analysis and abnormal pedestrian detection

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  • Pedestrian space-time outline presenting method based on ellipse Fourier decomposition
  • Pedestrian space-time outline presenting method based on ellipse Fourier decomposition
  • Pedestrian space-time outline presenting method based on ellipse Fourier decomposition

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[0024] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0025] Combined with the above technical solutions figure 1 To further expand, it mainly includes the following three aspects of processing:

[0026] 1. Image preprocessing;

[0027] Firstly, the background subtraction method is used to extract the pedestrian targets in the scene. In order to overcome the interference of factors such as light and wind in the scene, multiple distribution models of chromaticity and luminance space are used to establish the background model. When updating the background model, the update rate of the mean and variance and the replacement rate of multiple models are separated. For the case where pixel values ​​belong to multiple distribution models, the minimum similarity distance is used to determine the model to...

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Abstract

The invention discloses a pedestrian space-time outline presenting method based on ellipse Fourier decomposition. The method comprises the following three steps of: firstly, updating a background model by using a multi-distribution model, and then extracting time-space outline of original pedestrian to be processed by a binaryzation, morphology operator and 8-communication outline tracking method; confirming the point correspondence based on MDL (Master Data Library), increasing CDI (Comprehensive Dissertation Index) feature representing the grayscale distribution feature for the target function to obtain accurate point correspondence; and finally analyzing the closure of pedestrian outline, considering the periodicity characteristic that any point returns to the original position finally by moving along the outline, using the ellipse Fourier decomposition, neglecting the high-frequency shape detain section and keeping the low-frequency overall situation shape information so as to represent the high-dimensional 2D+time outline vector to be the low-dimensional EFCShape vector. The invention maintains the effective information of the outline analysis, realizes effective compression of outline data and provides an efficient outline representing method for application such as the subsequent gait identification.

Description

Technical field: [0001] The invention relates to the fields of computer image signal processing and statistical analysis, in particular to a pedestrian space-time profile representation method based on elliptic-fourier (elliptic Fourier) decomposition. Background technique: [0002] At present, video surveillance is developing from analog surveillance to all-IP network intelligent digital surveillance. An important aspect of digital surveillance is the use of computers to analyze human activities, which is also an important research direction in the field of computer vision. In the pedestrian-oriented intelligent monitoring system, in addition to judging the position of the pedestrian, it is also necessary to extract the outline of the person, so as to further analyze the 3D posture of the pedestrian in the scene. The contour extraction method is crucial for subsequent gait recognition and abnormal behavior detection. [0003] The method of capturing pedestrian outlines th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/64
Inventor 王绍宇杨松绍廖小勇罗友军张茵盛秀梅
Owner SHANGHAI FUKONG HUALONG MICROSYST TECH
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