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
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 informati

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Characteristic sampling method in photographic measurement
  • Characteristic sampling method in photographic measurement

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] When reconstructing a 3D model of a part, first perform a 3D solid modeling feature analysis on the part that needs 3D model reconstruction, analyze and judge the modeling features of the part according to the visible structure of the part, and according to the stretch feature constructed during the part design , Rotation feature, Sweep feature and other basic features determine the sampling location surface. When feature sampling, the positioning surface of the tested part should be determined to facilitate the acquisition of the basic features of the part’s cross-sectional contour line and its two-dimensional curve path, and support should be added when necessary to keep the part balanced.

[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-dimensional cross-sectional contour line along a certain path, that is, the formation of the basic feature of a part includes two elements: a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01C11/00G01B11/00G01B11/24G01B21/00G01B21/20
Inventor 方新
Owner BEIJING UNION UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap