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Stereo orthophoto pair-based large-scene stereo model generating method and measuring method thereof

A technology of three-dimensional model and three-dimensional orthorectography, which is applied in photogrammetry/video metrology, measuring equipment, 3D modeling, etc., can solve the problems of cumbersome process, reduced accuracy of elevation measurement, and inability to guarantee the accuracy of plane measurement. Achieve the effect of good tolerance and fast calculation speed

Active Publication Date: 2011-10-05
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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Problems solved by technology

At the same time, since both orthophotos and stereo matching images have the characteristics of mosaicking and splicing, it is possible to make a three-dimensional model of a large scene across image pairs; but there are still some problems in the current method of splicing stereoscopic orthophotos, such as the application number 200310111231.1 A method for generating a measurable seamless spatial three-dimensional model based on digital three-dimensional orthophoto mosaic, the inconsistency of the parallax direction will cause the reduction of the height measurement accuracy, and at the same time, the plane measurement accuracy cannot be guaranteed; the application number is 200310111230.7. The high-precision measurement method of the seamless stereo model based on the digital orthophoto image and the stereo auxiliary image, in order to ensure the accuracy, it is necessary to infer the coordinates of the image plane of the point in the original photo, and then calculate it by the front intersection. The process is cumbersome and the calculation efficiency is not good. high

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  • Stereo orthophoto pair-based large-scene stereo model generating method and measuring method thereof
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Embodiment Construction

[0025] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] see figure 1 , the continuous stereoscopic orthophoto model is generated according to the following steps:

[0027] 1. Calculate the quadrilateral area of ​​each aerial photo projected to the average elevation surface. The initial polygonal area of ​​the three-dimensional model is obtained by intersecting the quadrilateral areas of the adjacent photos of the same flight belt;

[0028] 2. Use the left slice of each model and the digital elevation model to generate an orthophoto in the initial polygonal area of ​​the model. The generation of the orthophoto image adopts the digital differential correction algorithm, the principle and process of the algorithm can be found in "Digital Photogrammetry" (Zhang Zuxun, Zhang Jianqing, Wuhan University Press, 1997);

[0029] 3. Mosaic the orthophotos of all models into the orthophotos of the whole area. During the pr...

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Abstract

The invention belongs to the technical field of surveying and mapping science, relating to a stereo orthophoto pair-based large-scene stereo model generating method and a measuring method thereof. The prior model generating and measuring methods have low measurement precision, or complicated calculation and low efficiency. The method provides the stereo orthophoto pair-based large-scene stereo model generating and measuring methods, embeds and establishes a large-scene stereo model by using the stereo orthophoto pair, and can quickly and accurately calculate three-dimensional coordinates of aterrain point. When the method is used for measuring, a parallax acquisition method in accordant direction is adopted, image points corresponding to the terrain points can be found at high speed, coordinates can be directly calculated through plane displacement without reversely thrusting three dimensional coordinates of an original image to carry out forward intersection, and the calculation precision of the method is very close to the stereo measurement precision of the original image pair.

Description

Technical field: [0001] The invention belongs to the field of surveying and mapping science and technology, and relates to a method for generating a three-dimensional model of a large scene based on a pair of three-dimensional orthophoto images and a measurement method thereof. The unique parallax acquisition method and plane coordinate displacement calculation can quickly and accurately calculate the three-dimensional coordinates of the ground point, and realize the accurate and fast measurement of the three-dimensional model. Background technique: [0002] A known stereoscopic orthophoto model is a model composed of orthophotos and stereo matching images (or called auxiliary stereoscopic images). The model retains a large amount of detailed surface information in aerial images, and with the help of stereoscopic display equipment, human eyes can see the real ground landscape. On the three-dimensional model, through a simple measurement method, non-professionals can easily ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05G01C11/00
Inventor 王争鸣王玮任晓春
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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