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Characteristic sampling method in photographic measurement

A photogrammetry and feature analysis technology, applied in photogrammetry/video surveying, measuring devices, mapping and navigation, etc., can solve the problems of slow processing speed, increasing the number of samples, and increasing the error of 3D model reconstruction.

Inactive Publication Date: 2007-01-03
BEIJING UNION UNIVERSITY
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Problems solved by technology

[0003] However, in the above-mentioned process, if the sampling method at equal intervals is used, if the cross-section is not properly selected, the obtained tomographic image of the part cannot accurately reflect the topological information of the part features, which will increase the error of the 3D model reconstruction; in order to reduce the error, it is necessary to increase the sampling number, resulting in a large amount of image processing and slow processing speed

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Embodiment Construction

[0020] When reconstructing the 3D model of a part, it is first necessary to analyze the 3D solid modeling characteristics of the part that needs 3D model reconstruction, analyze and judge the modeling characteristics of the part according to the visible structure of the part, and analyze and judge the modeling characteristics of the part according to the tensile characteristics constructed during the design of the part. , rotation features, sweep features and other basic features to determine the sampling positioning surface. When feature sampling, the determination of the positioning surface of the measured part should be made to facilitate the acquisition of the cross-sectional outline of the basic features of the part and its two-dimensional curve path. When necessary, support should be added to maintain the balance of the part.

[0021] The basic features of machinery and other parts can be described as a three-dimensional entity generated by the movement of a closed two-di...

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Abstract

A character sampling method of photograph measure, which includes the following steps: processes the three-dimensional entity sculpt character analysis for the accessories that need to three-dimensional model restructure; ensures the sampling orientation surface according to the basic character condition of the accessories; ensures the moving route of the accessory orientation surface according to the basic character condition of the accessory; processes fault measure to the section of the accessory orientation surface and the moving route by two-dimensional industry CT technology, thereby gets the two-dimensional section contour line and the two-dimensional moving route; achieves the three-dimensional module restructure of the accessory according to the section contour line and the route. The method can get more precision of the sampling and reduce the process speed.

Description

technical field [0001] The application relates to a feature sampling method in photogrammetry, which uses two-dimensional industrial CT technology to sample features of parts, and specifically relates to a feature sampling method for tomographic measurement of complex inner cavity parts by two-dimensional industrial CT technology. Background technique [0002] Tomography is a measurement method that uses computerized tomography technology to scan a physical section layer by layer along a certain direction to obtain a series of cross-sectional images. Extracting the cross-sectional profile curve of the measured entity through the images of each fault section can realize the three-dimensional reverse sum reconstruction of the measured object, which is a very widely used reverse calculation method at present. Tomography generally includes specific measuring equipment such as industrial CT (ICT, Industrial Computerized Tomography) and milling tomography. [0003] However, in th...

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Application Information

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IPC IPC(8): G01C11/00G01B11/00G01B11/24G01B21/00G01B21/20
Inventor 方新
Owner BEIJING UNION UNIVERSITY
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