Distance-constrained photogrammetric high-precision target positioning method

Abstract

The invention discloses a distance-constrained photogrammetric high-precision target positioning method. The method comprises the following steps of: the step 1, calibrating parameters in a camera; the step 2, shooting a target image containing an indium steel ruler; the step 3, measuring coordinates of the target point image; the step 4, calculating the three-dimensional coordinate of the target point by adopting a least square method, and taking the three-dimensional coordinate as the initial value of the physical coordinate of the target point; the step 5, acquiring initial values of elements of the external orientation of the image; the step 6, calculating the net adjustment of the distance constraint; and the step 7, performing adjustment iteration convergence determination, determining the correction number calculated each time until the difference limiting requirement is met, and obtaining the high-precision coordinate of the target point. The method does not need to independently arrange control points, can obtain millimeter-level target point location precision, is simple and quick, reduces operation time, has high measurement speed, and greatly improves measurement operation efficiency.

Description

technical field [0001] The invention relates to the technical field of photogrammetry and computer vision geometric positioning, in particular to a distance-constrained photogrammetric high-precision target positioning method. Background technique [0002] Photogrammetry target positioning is to use the camera to obtain the image of the target to be measured, and obtain the geometric and position information of the object after processing. It has the advantages of non-contact, fast speed, simultaneous acquisition of many observation targets, and high precision. It has expanded from the field of aerial photogrammetry to many fields such as archaeology (ancient cultural relics, ancient buildings, etc.), biomedicine, and industrial measurement. However, its main defect is that the measurement targets constructed using only images are relative in terms of geometric information such as size and mutual distance, that is, the 3D model constructed using images is similar to the actu...

AI Technical Summary

Problems solved by technology

[0013] This method is cumbersome and requires a lot of work, which is seriously inconsistent with the requirements of photogrammetry to quickly acquire a large number of measured targets.

Moreover, the measurement accuracy is high, the measurement time is tight, and the measurement space is limited.

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