Three-dimensional reconstruction method for large-scale outdoor scene

Abstract

The invention discloses a three-dimensional reconstruction method for a large-scale outdoor scene. The three-dimensional reconstruction method for the large-scale outdoor scene comprises the following steps of: using a multi-camera acquisition system, acquiring the images of the outdoor scene at different sight points, and calibrating the parameters of cameras; dividing the multiple cameras into camera clusters according to the relative position relationships and the imaging ranges of the cameras in the multi-camera acquisition system; for the cameras in the same cluster, recovering the three-dimensional structures of local areas in the scene according to the shot images; and performing registration and fusion on the three-dimensional reconstruction results of the different local areas, and recovering the three-dimensional structure of a full-shooting range in the scene. In the three-dimensional reconstruction method for the large-scale outdoor scene disclosed by the invention, the spatial information of the outdoor scene in the full-shooting range is recovered by the three-dimensional reconstruction results of the local areas, according to the images acquired at multiple sight points, and by using the multi-camera acquisition system with a specific structure, and a camera self-calibration method based on the outdoor scene; the reconstruction range is large; and the method is definite in principle and low in realization method.

Description

technical field [0001] The invention belongs to the technical field of computer vision, and in particular relates to a method for three-dimensional reconstruction of a large-scale outdoor scene. Background technique [0002] With the development of computer vision technology and the increase of people's production and living needs, 3D reconstruction technology has a good application prospect. The 3D reconstruction of outdoor scenes can play an important role in urban planning and construction, environmental observation and protection, and digital navigation. [0003] The techniques for reconstructing the three-dimensional model of objects with computer technology mainly include: geometric modeling method, three-dimensional scanning method, and image-based method. The 3D visualization methods of outdoor scenes include: building a 3D model of the scene based on spaceborne images or airborne images; methods based on distance; methods based on images. in: [0004] The method ...

AI Technical Summary

Problems solved by technology

For the measurement and modeling of large-scale scenes, carrier equipment and navigation systems are usually required, the amount of measurement data is large, the measurement time is long, and the complexity of the 3D reconstruction process is high

[0006] The image-based method extracts the geometric information of the scene from multi-viewpoint images, but the existing image-based 3D modeling methods for outdoor scenes are only suitable for simple scenes, not suitable for large-scale scene modeling

Due to the limited range of camera viewing angles, if a large-scale scene is modeled, a large number of images from different viewpoints are required, which increases the cost and complexity of processing

Camera calibration is required for 3D reconstruction based on images. As far as shooting outdoor scenes is concerned, it is not suitable to use calibration objects, so it is necessary to perform self-calibration according to the characteristics of outdoor scenes. When the number of shooting viewpoints is large and the viewpoint changes are complicated, the difficulty of camera calibration and The complexity increases, and the accuracy of 3D reconstruction is not high

[0007] Therefore, existing image-based methods are not suitable for 3D reconstruction of large-scale outdoor scenes.

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