Camera self-calibration technology-based river model topography measurement method

Abstract

The invention relates to a camera self-calibration technology-based river model topography measurement method and belongs to the technical field of river model measurement. The method includes the following steps that: a calibration board is manufactured and mounted, and auxiliary calibration sheets are manufactured and scattered, and pictures of a river model are taken, and feature points of the pictures are extracted, and all the pictures are matched with each other in pairs, and the feature points in the picture pairs are matched with each other based on feature distance; unreasonable matched identical name point pairs are eliminated, and one pair of pictures having the most matched identical name point pairs is selected, and camera parameters and the world coordinates of the matched identical name point pairs are calculated; and an optimization solution method is utilized to finely adjust the camera parameters of solved pictures, and sparse point cloud of the river model is calibrated, and dense point cloud of the river model is generated, and the topography of the river model can be generated according to three-dimensional coordinate data of the dense point cloud of the river model. The camera self-calibration technology-based river model topography measurement method of the invention has the advantages of high precision, convenient use and low cost.

Description

technical field [0001] The invention belongs to the technical field of river engineering model measurement, in particular to a river engineering model terrain measurement method based on camera self-calibration technology. Background technique [0002] During the planning, design and construction of important water conservancy and hydropower projects, river engineering model tests (studies on river bed evolution and river regulation) are required. By measuring the model topography before and after the test, we can obtain the scour-silt changes of the riverbed and the amount of sediment scour-silt under different flow conditions. The early measurement methods were mainly based on manual measurement using a level instrument. This method is time-consuming and laborious, and there are relatively few measurement points, resulting in a low-resolution model terrain. With the development of automatic measurement and control technology, a large number of river engineering model topo...

AI Technical Summary

Problems solved by technology

This type of method requires multiple cameras, and the parameters of each camera are calibrated in advance. During the measurement process, all parameters such as the position and focal length of the camera cannot be changed. In actual use, the equipment cannot be moved after it is set up. The measurement of a single set of equipment The scope is small, when it is necessary to measure a large-scale river engineering model, it is necessary to arrange multiple sets of equipment

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