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Dense DSM generation method based on object-side semi-global multi-view image matching

A multi-view image, semi-global technology, applied in image analysis, image enhancement, image data processing, etc., can solve the problems of poor reliability, low operating efficiency, low DSM matching technology accuracy, etc., to ensure stability and reliability. , the effect of simplifying the elevation range and improving the matching accuracy and efficiency

Inactive Publication Date: 2018-08-17
BEIJING GEOWAY SOFTWARE
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to make full use of the redundant observation conditions of multi-view images to solve the problems of low precision, poor reliability and low operating efficiency of traditional DSM matching technology

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  • Dense DSM generation method based on object-side semi-global multi-view image matching

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Embodiment Construction

[0013] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] The embodiment of the present invention provides a dense DSM generation method based on object-side semi-global multi-view image matching, such as figure 1 As shown, the method includes the following steps:

[0015] Step 101, generation of initial DSM, which may include the following steps:

[0016] Step 101-1, using Föstner and Harris operators to extract feature corners of the image;

[0017] Step 101-2, using the epipolar line condition as a constraint to perform pyramid-based multi-image feature corner matching to generate a sparse 3D point cloud;

[0018] Step 101-3, construct a triangulation network for the sparse 3D point cloud generated in step 101-2, and interpolate a rough DSM;

[0019] Step 102, calculation of...

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Abstract

As a key component of 4D products, a digital surface model (DSM) has a wide use range and use value in the field of national basic mapping. In order to accurately, stably and efficiently generate a digital surface model, the present invention discloses a dense DSM generation method based on object-side semi-global multi-view image matching. The method uses feature matching and triangulation network (TIN) interpolation to establish an initial DSM, introduces multi-view image matching of object-side geometric constraints through object-side space grid division, forms the DSM by matching cost aggregation of object-side space three-dimensional coordinates, and finally uses a series of data post-processing to remove the mismatched area and fill the default elevation area. After a lot of experiments, the method greatly improves the accuracy, reliability and efficiency of digital surface model matching.

Description

technical field [0001] The field of surveying and mapping technology. Background technique [0002] The existing stereo matching methods are divided into two categories: one is local matching (Local Matching or Window-based Matching) methods, because these algorithms themselves cannot reflect the integrity and are difficult to deal with occlusions, they often cannot obtain high-precision results ; The other type is the Global Matching method, which usually incorporates the stereo matching problem into an energy minimization framework, minimizes the energy function through some optimization methods, and finally obtains a globally consistent matching result. Its methods include based on Image segmentation methods, graph cut (Graph Cut), dynamic programming, methods based on belief propagation, etc. The matching result of the global matching algorithm is better than that of the local matching, but the main disadvantage is that the calculation efficiency is low. Especially for...

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Application Information

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IPC IPC(8): G06F15/00G06T7/33
CPCG06F15/00G06T2207/10028
Inventor 李健
Owner BEIJING GEOWAY SOFTWARE
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