Single sight plane measuring method based on parallel lines
A technology of plane measurement and parallel lines, which is applied in measuring devices, photogrammetry/video metrology, surveying and navigation, etc. It can solve the problems of difficult selection of control points, difficulty in putting into practical application, and inability to measure images, etc. Achieve the effects of good robustness, avoid inconvenience, and high measurement accuracy
Inactive Publication Date: 2006-12-06
INST OF AUTOMATION CHINESE ACAD OF SCI
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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
The second 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
The third method is to place a template containing certain regular geometric figures on the scene plane in advance, and use the template information to calculate the projection matrix. This method is sometimes subject to certain restrictions in practical applications. way to measure
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[0024] like figure 2 Shown is an image of a tested scene. According to the method described in the present invention, two groups of mutually perpendicular parallel lines are extracted in the image as shown in the green lines, and the transformation matrix is calculated by using its blanking points and the side length of one of the frames is selected as the reference distance, in the image Select two points with the mouse, and then use the transformation matrix and the reference distance to directly calculate the distance between the two points in the scene from the image. For example: D 1 ,D 2 The real lengths of the two are respectively 362.96cm and 429.05cm, the measured values obtained by the method of the present invention are respectively 365.82cm and 433.36cm, and the relative errors of the measurement are respectively 0.79% and 1.0%, which can reach the measurement accuracy requirements.
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A single visual plane measuring method based on parallel lines includes such steps as taking one or more images of the scene to be measured, extracting two groups of parallel lines or line segments, which are perpendicular to each other, and reference distance information, calculating the blanking points of said parallel line groups, creating a transform array, and find out the distance between any two points in said scene. Its advantages are simple method, and high precision and robustness.
Description
technical field [0001] The invention relates to computer-aided automatic measurement, in particular to a single-view plane measurement method based on parallel lines. Background technique [0002] In our daily life and in many fields, measurement, especially the measurement between two points in the same plane is essential, such as traffic accidents, criminal 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 visi...
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IPC IPC(8): G01C11/00
Inventor 王光辉胡占义
Owner INST OF AUTOMATION CHINESE ACAD OF SCI