Rapid orthoimage generation method based on an unmanned aerial vehicle

A technology of orthophotos and UAVs, applied in the field of aerial image processing, can solve the problems of difficult setting of control points, heavy workload of surveying, etc., achieve accurate georeferencing, improve reconstruction efficiency, and reduce the number of optimized parameters Effect

Active Publication Date: 2019-04-19
夏桂松
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Problems solved by technology

Usually, many control points are required, so the workload of the field survey is very large. In addition, in areas with complex terrain or difficult conditions, it is difficult to manually set the control points

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  • Rapid orthoimage generation method based on an unmanned aerial vehicle
  • Rapid orthoimage generation method based on an unmanned aerial vehicle
  • Rapid orthoimage generation method based on an unmanned aerial vehicle

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[0020] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Such as figure 1 As shown, the embodiment of the present invention proposes a method for generating a fast orthophoto based on a drone, and the specific steps are as follows:

[0022] S1. Cluster the images based on the similarity of the scene content and space. The flowchart is as follows figure 2 As shown, it mainly includes the following steps:

[0023] S11. Construct a visual representation mo...

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Abstract

The invention discloses a fast ortho-image generation method based on an unmanned aerial vehicle. The method comprises the steps that images are clustered by integrating the similarity of scene content and space; Rapidly generating a sparse three-dimensional reconstruction result of each group on the basis of scene clustering, wherein the sparse three-dimensional reconstruction of each group is executed in parallel; Carrying out geographic registration under the condition of no ground control point, and fusing registration results of each group; Calculating an orthoimage corresponding to eachimage by utilizing similarity transformation, and finally superposing the orthoimages into an integral orthoimage. According to the method, matching of all the images can be completed with the lineartime complexity, and the matching relation between the images can be rapidly obtained; The number of optimization parameters of a single scene can be greatly reduced, so that the reconstruction efficiency is greatly improved; Accurate geographic registration can be realized only by utilizing the POS information obtained when the unmanned aerial vehicle flies and the camera position calculated by sparse three-dimensional reconstruction, and no additional control point is needed.

Description

Technical field [0001] The invention belongs to the technical field of aerial image processing, and more specifically, relates to a method for generating fast orthophotos based on drones. Background technique [0002] Compared with traditional aerial photogrammetry technology, UAV low-altitude remote sensing technology has the advantages of low cost, high resolution, and flexibility. However, the images obtained by UAVs are different from those obtained by traditional aerial photogrammetry. There are problems such as small image size and large quantity. These problems bring great difficulties to image matching and rapid image reconstruction. [0003] In the three-dimensional reconstruction technology based on image feature matching, image matching usually adopts a pairwise matching method, which brings great time consumption. Although it is possible to perform matching based on the sequence relationship of the images, due to the various route types of aerial photography, including...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/579G06T7/33G06T7/66G06K9/62
CPCG06T7/33G06T7/579G06T7/66G06T2207/30181G06T2207/10028G06T2207/10004G06F18/23213
Inventor 卢雲成张驰张恒
Owner 夏桂松
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