Visual field boundary generating method for wide-angle cameras having overlapped visual fields
A field of view dividing line, camera technology, applied in the field of image processing
Active Publication Date: 2017-07-21
NORTHEASTERN UNIV
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Experiments show that this method effectively solves the problem of multi-camera field of view boundary generation in the presence of distortion. For applications that require image content analysis of multiple wide-angle cameras, the field of view boundary generation method under wide-angle cameras has considerable applicable value
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[0029] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0030] In the method of this embodiment, the software environment is the WINDOWS 7 system, and the simulation environment is MATLAB2013a.
[0031] Step 1: Calibrate the wide-angle camera. The field of view of the wide-angle camera used is 150°, and the resolution is 640*480. The related parameters of the camera are as follows:
[0032] (1) Principal point coordinate value: u 0 =267.3437, v 0 =362.0111
[0033] (2) The value of the distortion correction parameter ki is as follows:
[0034] k1=0.36; k2=0.38; k3=0.0016; k4=0.00000078; k5=-1.3297*10-10
[0035] Through the relationship (1), the corresponding relationship between the image pixel coordinates before and after correction is obtained, and for the image hole caused by image scaling, the method of the nearest neighbor difference is used. original image as figure 1 As shown,...
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The invention relates to a visual field boundary generating method for wide-angle cameras having overlapped visual fields. A back-projection manner is employed, the visual field boundary of a corrected image is projected back to a wide-angle image. The visual field boundary generating method comprises following steps of firstly correcting a distorted image by means of a Zhengyou Zhang calibration method and a polynomial distortion correction model, deleting mismatching by extracting SIFT characteristic points and by means of RANSAC algorithm, achieving image registration on two adjacent images, generating a visual field boundary in a corrected image by means of an averaging method, and finally projecting the visual field boundary back to a wide-angle image by means of a corresponding relational expression of image pixel coordinates before and after distortion correction. Aiming at the problem that distortion is lead into a distortion camera, and therefore a conventional analysis method is not suitable, an inverse mapping method is employed to accurately obtain the visual field boundary in the distortion image, and the visual field boundary generating method has an important application value for achieving target handoff of wide-angle cameras having overlapped visual fields.
Description
technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for automatically generating a visual field dividing line under a wide-angle camera with overlapping visual fields. Background technique [0002] Video surveillance systems are increasingly used in commercial, national defense, and military fields. The current research on intelligent surveillance systems focuses on target detection, tracking, and behavior analysis and recognition. Target tracking in the field of view is the most important key technology and the basis of various subsequent technologies. Obtaining a wide field of view and achieving long-term target tracking requires the use of camera combinations to expand the field of view. The resulting problem is the information interaction and fusion between different cameras. For the target tracking under the combination of cameras, it is necessary to judge whether the target crosses the field of view, and mat...
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Login to View More IPC IPC(8): G06T5/00G06T7/33G06T7/80
CPCG06T2207/10004G06T5/80
Inventor 张云洲张亚洲王常凯陶亮王争崔家华张杰
Owner NORTHEASTERN UNIV