Tree three-dimensional reconstruction method based on unmanned aerial vehicle aerial photo sequence image

A technology of sequence images and 3D reconstruction, applied in image analysis, image data processing, 3D modeling, etc., can solve the problems of 3D image distortion of tree objects, complex imaging model of aerial camera, and vibration of aerial camera.

Inactive Publication Date: 2013-12-04
TIANJIN UNIV
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Problems solved by technology

In the 3D reconstruction of aerial images, the vibration, rotation, and movement of the drone's aerial photography will cause the vibration of the aerial camera, which makes the imaging model of the aerial camera more complicated.
Among them, most of the 3D reconstruction ...

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  • Tree three-dimensional reconstruction method based on unmanned aerial vehicle aerial photo sequence image
  • Tree three-dimensional reconstruction method based on unmanned aerial vehicle aerial photo sequence image
  • Tree three-dimensional reconstruction method based on unmanned aerial vehicle aerial photo sequence image

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Embodiment Construction

[0051] The specific implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0052] According to the technical solution of the present invention, in terms of image acquisition, this embodiment uses a drone to take aerial photography in a mountainous area to obtain images, and select a suitable tree crown image size according to the size of the tree crown to cover all areas of the tree crown, ensuring that the tree crown information will not be lost. Therefore, the development Or choose a 128×128 canopy image, such as Image 6 shown. In order to eliminate the impact of the non-canopy area on the reconstruction process without losing the information of the canopy, the grabcut algorithm is used to remove the background of the canopy image, such as Figure 7 shown.

[0053] The implementation of the three processes of feature point extraction and matching, depth calculation and 3D modeling ...

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Abstract

The invention discloses a tree three-dimensional reconstruction method based on unmanned aerial vehicle aerial photo sequence images. According to the tree three-dimensional reconstruction method, firstly, characteristic regions of a crown are extracted in a watershed partition method, then, the characteristic regions are matched by calculating region correlation coefficients in an RGB color space, matched characteristic dot pairs are extracted, depth information is calculated through the binocular stereo vision principle combined with imaging models of an aerial photo camera, and finally a three-dimensional model of a tree is constructed based on L system laws. Compared with the prior art, the tree three-dimensional reconstruction method has the advantages that grain, color and outline information of the crown are considered, and the characteristic spot set which can show the crown complicated structure is fully extracted; in addition, the depth information of the characteristic spot set is calculated according to complicated imaging models of the aerial photo camera with shake, transverse moving and the like of the camera in the aerial photo process of an unmanned aerial vehicle considered, a reasonable tree modeling approach is adopted, and therefore reasonable approximate three-dimensional models of the tree are constructed.

Description

technical field [0001] This patent relates to image three-dimensional reconstruction technology, in particular to a three-dimensional reconstruction method based on UAV aerial photography sequence images. Background technique [0002] UAV aerial photography is an important data source for spatial data acquisition in recent years. UAV aerial photography can perform multiple imaging of the same target and scene to form multi-view and multi-position imaging. Through the onboard high-resolution optical camera, the UAV can obtain a large number of image sequences at one time, and these images have high resolution, high overlap rate, and can be measured. Applying the relevant theories and technologies of 3D reconstruction of sequence images, the 3D model of the ground target can be obtained by processing the UAV sequence imaging. [0003] The principle of the three-dimensional image reconstruction method is to obtain two images of the same target from different angles through th...

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Application Information

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IPC IPC(8): G06T17/00G06T7/00
Inventor 冯志勇陆泽萍徐超张东萍王丹丹
Owner TIANJIN UNIV
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