Camera array dynamic focal plane estimation method

A camera array, focal plane technology, used in computing, image data processing, instrumentation, etc., to solve problems such as poor automatic performance

Inactive Publication Date: 2013-11-27
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency of poor automatic performance of the existing hidden target perspective imaging method based on camera array synthetic aperture imaging, the present invention provides a camera array dynamic focal plane estimation method

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Embodiment Construction

[0019] The specific steps of the method for estimating the dynamic focal plane of the camera array of the present invention are as follows:

[0020] Assuming there are viewnum cameras, this embodiment selects viewnum=8, and numbered cameras 1,2,...,8 in the order of the horizontal direction. Select a camera as the reference camera. See step (4) for the selection criteria ②.

[0021] (1) Single-camera time series constraints.

[0022] For the image sequence captured by each of the cameras of No. 1-8, the KLT method is used to calculate and match the optical flow feature points between frames in the sequence. Assume Represents the homography from frame t to frame t-1 of the i-th camera, with Denote the feature points corresponding to the t-1th frame and the tth frame respectively, and the single-camera time series constraint is expressed as follows:

[0023] E l ( H t ( t - 1 ) ) = X i = 1 viewnum | | w t - 1 i ...

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Abstract

The invention discloses a camera array dynamic focal plane estimation method which is used for solving the technical problem that a hidden target perspective imaging method based on camera array synthetic aperture imaging is poor in automatic performance. According to the technical scheme, camera array automatic focusing and shielded moving target perspective imaging are divided into a focusing module and an imaging module respectively, the two modules are fused in a whole algorithm framework in a seamless mode, and automatic focusing and clear imaging are achieved through seamless interaction between the two modules. A dynamic estimation optimal focal plane estimation algorithm based on local and global constrained optimization is adopted in the focusing module, and an active synthetic aperture imaging algorithm based on visibility analysis is adopted in the imaging module. According to the method, due to the fact that a moving target optimal focusing plane is estimated based on the local and global constrained optimization method, a shielding article is effectively removed from a synthetic image based on visibility analysis, and quality of shielded moving target synthetic aperture imaging is obviously improved, and automatic performance is good.

Description

Technical field [0001] The invention relates to a method for estimating a dynamic focal plane of a camera array. Background technique [0002] The document "Synthetic Aperture Focusing Using a Shear-Warp Factorization of the Viewing Transform, IEEE Conference on Computer Vision and Pattern Recognition-Workshops, 2005, pp.129" discloses a perspective imaging method for hidden targets based on synthetic aperture imaging of a camera array. This method uses homography mapping and cohomology mapping to project the images taken by each angle of view in the camera array system to the focus plane where the target is located under the condition of a given imaging target focus depth. Among them, the homography mapping uses the corresponding feature points in the images of each view angle to estimate, and the coherence mapping is calculated according to the relative position of each camera in the array system and the target focus depth. This method regards the camera array system as a "syn...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T5/00
Inventor 杨涛张艳宁张晓强余瑞陈挺冉令燕宋征玺
Owner NORTHWESTERN POLYTECHNICAL UNIV
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