Orthogonal projection emendation method for image measurement in industry close range photography

A technology of close-up photography and correction method, applied in the field of image processing, can solve the problems of increasing the workload of data collection, increasing the time of data processing, unfavorable work, etc., so as to reduce the workload and the time of data processing, improve the utilization rate, reduce the The effect of labor intensity

Inactive Publication Date: 2008-09-24
DONGHUA UNIV
View PDF0 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will increase the workload of data collection and increase the time for data processing.
And when the shooting scene is very large, it is very likely that there will be missed shots, which will be unfavorable to the follow-up work

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
  • Orthogonal projection emendation method for image measurement in industry close range photography
  • Orthogonal projection emendation method for image measurement in industry close range photography
  • Orthogonal projection emendation method for image measurement in industry close range photography

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] A description of the principle of the orthographic correction method for measuring images in industrial close-range photography according to the present invention:

[0040] Camera imaging is a process of projective transformation, and perspective deformation is its inherent characteristic. Imaging models such as figure 1 shown.

[0041] The imaging process can be considered as projecting the trapezoidal area (ABCD) on a certain plane onto the rectangular area (abcd) on the CCD along the optical axis, and the perspective distortion comes from this. If the image abcd can be "restored" to ABCD, it is equivalent to obtaining a front-facing image of the trapezoidal area. With the help of the corresponding relationship between abcd and ABCD four pairs of points, the transformation matrix of this "reduction" process can be constructed.

[0042] And we can obtain the corresponding relationship between these four pairs of points through the shooting angle α and the shooting d...

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

An orthographic projectional correction method of a close shot photogrammetric image used in an industry relates to the technical field of an image processing and solves the technical problems that the accuracy and the efficiency of the photogrammetric image are low; the orthographic projectional method creates a back projection transformational model by utilizing a shooting distance, a shooting angle and an imaging law of an isometric object; the steps of the method are as follows: 1) an extreme value of a ratio relation of an image size of the isometric object and a vertex angle along the horizontal direction of a camera lens are respectively obtained; 2) corresponding relations between the four pairs of points C-c, D-d, E-e and F-f are obtained: 3) by the back projection transformation, an area abcd of the image is converted into the ladder-shaped area ABCD. The orthographic projectional correction method of the invention has the advantages that the accuracy and the efficiency of an automatic decoding algorithm are enhanced, a work load of a data acquisition and the time of a data processing are reduced, an utilization ratio of an encoding mark in the single image is improved, and the labour intensity of the on-the-spot data acquisition is also reduced.

Description

technical field [0001] The invention relates to image processing technology, in particular to an orthographic correction method for measuring images in industrial close-range photography. Background technique [0002] Industrial close-range photogrammetry obtains the three-dimensional data of the measured object by measuring the coordinates of artificial marker points placed at key positions on the measured object. Its direct measurement objects are artificial landmarks, not the measured object itself. One type of artificial marker points that represent different encoded information through different patterns is called "coded markers". During on-site data collection, various artificial signs are placed around the measured object, and then photographed with a digital camera. The acquired image is processed to identify the codes of each coded mark. [0003] Some coded signs that are far away from the camera and have a large shooting angle cannot automatically recognize thei...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G01C11/04
Inventor 戴惠良钟建安楚万秀方洁邹伟朱丰训马涛
Owner DONGHUA UNIV
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