Method of measuring scene and geometric data of bodies inside the scene via single frame of image

Abstract

The measurement of geometric data of scene and bodies in the scene via single frame of image includes the following steps: taking image of the scene and inputting it into computer; extracting the data of point and straight line in reference plane of the scene, parallel lines perpendicular to the plane and the reference distance; finding out the mapping matrix between the reference plane and the image plane; calculating the blanking point in the direction perpendicular to the reference plane and the blanking line of the reference plane; extracting the boundary information of the bodies to be measured in the image, sectional fitting to form the straight line or quadric curve and finding out the coordinate of center point of bodies; and measuring geometric data, including spatial coordinates, distance, angle, area, volume, etc. of scene and bodies in the scene.

Description

technical field [0001] The present invention relates to computer aided automatic measurement. Background technique [0002] In our daily life and in many fields, measurement is essential, such as traffic accidents, criminal crime scenes, buildings, construction sites, etc., require a lot of measurement work. The traditional method is to use manual measurement, which is very time-consuming and prone to large measurement errors, and this measurement is also prone to unfair results due to the subjective factors of the measurers. [0003] In recent years, with the development and application of computer vision, people have begun to explore the use of computer vision methods to measure through images. In this type of method, it is typical to reconstruct the three-dimensional structure of the scene under test by two or more images using stereo vision, but this method involves a classic problem in the field of computer vision, that is, the matching between multiple images. , so i...

AI Technical Summary

Problems solved by technology

In this type of method, it is typical to reconstruct the three-dimensional structure of the scene under test by two or more images using stereo vision, but this method involves a classic problem in the field of computer vision, that is, the matching between multiple images. , so it is difficult to put into practical application

Another method is to manually measure the information of more than 4 control points in the scene plane in advance to calculate the projection matrix between the space plane and the image plane, and then measure through a single image. The measurement accuracy and control of this method The selection accuracy, position and number of points are directly related, but in practical applications, sometimes it is difficult to select control points, and the measurement accuracy of control points cannot be guaranteed

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