Calibration-free photogrammetry method

Abstract

The invention relates to an calibration-free photogrammetry method, which comprises a front station camera with n positioning key points and a rear station binocular camera positioned behind the front station camera; the positions of two cameras of the rear station binocular camera are fixed, so that the object space coordinates of exterior orientation elements of the rear station binocular camera are kept unchanged; and the exterior orientation elements of the front station camera of the actual measurement site are ingeniously obtained by combining the spatial station shifting matrix and the exterior orientation elements of the front station camera of the calibration site, so that the object space coordinates of a to-be-measured target are easily obtained, and the method is simple, convenient, efficient and accurate in measurement. The method ensures the measurement precision and is convenient and simple to operate.

Description

technical field [0001] The invention relates to the technical field of measurement, in particular to a calibration-free photogrammetry method. Background technique [0002] As a non-contact measurement method, photogrammetry is widely used in the field of measurement technology, especially for large mechanical structures represented by port cranes. However, the current photogrammetry methods have encountered many obstacles in practical engineering applications. [0003] The traditional photogrammetry method needs to manually set the control points. When the target object is inconvenient to approach, so that the control points cannot be set well, this method will seriously reduce the measurement work efficiency, especially for large mechanical structures that are inconvenient to climb , and will increase security risks. [0004] At the same time, the control points are mainly selected from the target object, and when the target object itself has a rough manufacturing proces...

AI Technical Summary

Problems solved by technology

[0003] The traditional photogrammetry method needs to manually set the control points. When the target object is inconvenient to approach, so that the control points cannot be set well, this method will seriously reduce the measurement work efficiency, especially for large mechanical structures that are inconvenient to climb , and will increase security risks

[0004] At the same time, the control points are mainly selected from the target object, and when the target object itself has a rough manufacturing process, it will be difficult to accurately locate the key points when selecting the control points from itself, resulting in image plane coordinate recognition errors and affecting the accuracy of the entire measurement system. This is especially true for large mechanical structures

[0005] Moreover, the traditional photogrammetry method relies on auxiliary measurement equipment such as total stations when selecting control points. When the target object is in a harsh environment and cannot be transported or use such auxiliary measurement equipment, it is difficult to obtain the object space coordinates of the control points. , resulting in the impossibility of the photogrammetry method. For example, because of the thick cinder layer on the bulk cargo terminal, the transportation and use of traditional auxiliary measurement equipment such as total stations are extremely inconvenient. Without these auxiliary equipment, the traditional photogrammetry method will be Cannot be implemented because the control point object space coordinates cannot be obtained

Images