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Method and apparatus for detecting moving goal shade

A moving target and shadow detection technology, applied in the field of moving target detection and processing, can solve the problem that real-time monitoring is not easy to achieve.

Inactive Publication Date: 2008-07-30
ANKE SMART CITY TECH PRC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Model-based methods assume that the 3D shape of the target and the properties of the light source are known, and the shape and position of the shadow can be accurately calculated by the model, but this is not easy to achieve in real-time monitoring

Method used

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  • Method and apparatus for detecting moving goal shade
  • Method and apparatus for detecting moving goal shade
  • Method and apparatus for detecting moving goal shade

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Embodiment Construction

[0031] The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

[0032] In the present invention, the moving target is a general name, that is, a foreground object that is different from the background.

[0033] Please refer to Figure 2. At different times, there are many differences in the relative positions of the shadow and the target, but the orientation of the shadow relative to the target can always be summarized as upper left, left, lower left, front, lower right, right, upper right, and rear. Shadows can be divided into two categories, left and right, and two special types, front and back. As shown in Figure 2, the number 1 is the target, and the number 2 is the shadow. For a specific section of road, the camera is installed facing the road, and the possible location of shadows during the day can be determined.

[0034] The present embodiment is shown in Figure 3 for the detection of shadow, compri...

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PUM

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Abstract

The invention discloses a moving target shadow detection method, which comprises the following steps of: A1. detecting the moving target according to video images to determine the moving target area; B1. determining whether the shadow exists in the moving target area and turning to the following steps if the shadow exists in the area; C1. obtaining the histogram of the number of the pixels of the moving target in the vertical direction; D1. calculating an optimal threshold used for dividing the histogram into two types of areas; E1. determining the shadow area. By adopting the invention, the shadow is detected without being influenced by weather. In addition, the invention can be adapt to various complex backgrounds and targets, and can detect the shadow of the moving target accurately.

Description

【Technical field】 [0001] The invention relates to detection and processing of moving objects, in particular to a shadow detection method and device when the moving object has a shadow. 【Background technique】 [0002] Behavior analysis is through the intelligent analysis and logical reasoning of moving objects to realize specific functions such as items left behind, items lost, illegal intrusion, vehicle retrograde, traffic flow statistics, illegal parking, vehicles running red lights, access control retrograde detection, people counting, tailgating alarm, etc. . [0003] In the urban road monitoring system, CCD camera has become the preferred device in the system because of its good cost performance and intuitive images. Through the video image, specific behaviors such as vehicle retrograde, illegal parking, and illegal lane change can be located and alarmed. However, the video image is greatly affected by the light source. When the light source is blocked by opaque object...

Claims

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Application Information

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IPC IPC(8): G06T7/20G06K9/62
Inventor 徐韶华
Owner ANKE SMART CITY TECH PRC