Method for measuring railway tank car volume based on computer vision

Abstract

The invention relates to a method for measuring railway tank car volume based on computer vision. The method comprises the following steps that the surface of a tank car is provided with a plurality of marking points with identical patterns and coding points with different patterns; a coding point ruler with two different patterns is arranged beside the tank car; a digital camera is adopted to take pictures of the tank car from multiple angles, and an overlapped coding point area is formed between every two adjacent pictures; each picture is input to a computer for image processing, and three-dimensional point coordinates of all coding points and marking points on an image are respectively established according to a computer stereovision three-dimensional reconstruction method based on image sequences so as to acquire three-dimensional point data on the surface of the tank car; three-dimensional shape of the outer surface of the tank car is reconstructed according to the three-dimensional point data; and the tank car volume is calculated according to the three-dimensional shape of the outer surface of the tank car and measured wall thickness of the tank car. The method has the advantages that the method has convenient operation and simple use and solves the problem that the prior standard measuring instrument is susceptible to human-induced factors during operation and has unstable measuring results; moreover, the method ensures that volume uncertainty is less than 0.2 percent.

Description

technical field [0001] The invention relates to technologies such as image processing, three-dimensional data point processing, and computer software, in particular to a method for measuring the volume of a railway tank car based on computer vision. Background technique [0002] Railway tank car is not only a kind of measuring instrument, but also a means of transportation. As a measuring instrument, the accuracy of its tank volume affects the smooth progress of trade settlement. Periodic compulsory inspection; as a means of transportation, its loading level (loading quality and loading liquid level) is directly related to the safety of railway transportation, so the Ministry of Railways also manages it as a safety device, and handles it in railway tank cars During the transportation permit and the once-a-year rail transit procedures, the volume verification certificate of the railway tank car (the certificate provides the standard loading height range value of the railway t...

AI Technical Summary

Problems solved by technology

The use process of the measurement standard device is greatly affected by human factors, the measurement results are unstable, the technical level is low, the technological content is not high, and the measurement accuracy is not high. Although it can meet the current railway tank car volume verification uncertainty of 4‰ in China. Requirements, but the international regulation is 2‰, therefore, it is necessary to study a new railway tank car volume verification method to improve the accuracy of the railway tank car volume and meet the international standards

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