A Visual Measurement Method of Irregular Object Volume

Abstract

The invention belongs to a visual measurement method for the volume of an irregular object. According to the method, firstly, a system is demarcated, and the pixel equivalent of the system is obtained; secondly, three cameras are utilized for respectively obtaining original images of an object to be measured in three directions of overlooking, left looking and right looking, and in addition, the maximal peripheral length image coordinate parameter of the object to be measured is obtained through a top view; then, a left view and a right view are subjected to three-dimensional reconstruction based on the gray level, and meanwhile, the maximal length pixel of the top view is used as the basis for cutting the reconstruction range corresponding to the left view and the right view; next, corresponding statistical algorithms are adopted for calculating the volume of a three-dimensional object in a three-dimensional model in an image coordinate; and finally, the practical volume of the object to be measured in a world coordinate system is calculated according to the pixel equivalent. The visual measurement method has the advantages that the image grey value is utilized for the three-dimensional reconstruction of the object in an image coordinate system, the volume of the object is calculated through the pixel value, only the pixel equivalent is demarcated in the method, the calculation speed is high, and the real-time requirement can be met in the precision range.

Description

technical field [0001] The invention belongs to the technical field of measurement, in particular to a visual measurement method for the volume of irregular objects. Background technique [0002] Volume measurement is used in many fields. In industrial production, it is often necessary to measure the volume of irregular objects, such as an online inspection system for industrial raw materials. With the development of measurement technology, the measurement environment and measurement methods of irregular objects are constantly innovating, and there are more and more measurement projects with special needs. [0003] The traditional measurement of the volume of irregular objects mainly uses two methods: manual sorting and volume equivalent calculation using known density. It is suitable for the measurement of large objects, but it is also difficult to achieve non-contact measurement. The existing computer vision-based measurement system is mainly to obtain object image infor...

AI Technical Summary

Problems solved by technology

[0003] The traditional measurement of the volume of irregular objects mainly uses two methods: manual sorting and volume equivalent calculation using known density. Suitable for measurement of large objects, but also difficult to achieve non-contact measurement

The existing computer vision-based measurement system is mainly to obtain object image information from different angles, and perform 3D reconstruction in the world coordinate system according to the conversion relationship between world coordinates, camera coordinates and image coordinates. This method is computationally complex and does not have real-time In addition, objects are divided into different cylinders through surface information, and then their volume is calculated. The limitation of this method is that it cannot automatically measure the volume of space objects, and the accuracy of objects with complex shapes is not high.

Existing methods for measuring the volume of irregular objects limit their application in industrial processes to some extent

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