Three-point coding mark point based method for measuring key points of vehicle frame

A technology for marking points and key points, applied in the field of measurement systems, can solve problems such as large cumulative errors, small single measurement range, and difficult global control, to meet the needs of 3D topography, solve 3D measurement problems, and expand Effects in the field of application

Inactive Publication Date: 2011-03-30
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

However, the single measurement range of the grating measurement method is small. For large objects, it needs to be realize

Method used

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  • Three-point coding mark point based method for measuring key points of vehicle frame
  • Three-point coding mark point based method for measuring key points of vehicle frame
  • Three-point coding mark point based method for measuring key points of vehicle frame

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Embodiment Construction

[0045] A specific implementation of the method for measuring key points of a vehicle frame based on three-point coding marking points is: designing and processing coding marking points, high-precision cross targets, and a ruler system; Marking points; place the cross target and the ruler near the measured object, the principle of placing the cross target and the ruler is: when using the high-precision digital camera to take pictures of the cross target and the ruler, the cross target and the ruler can be photographed at the same time At least three coded marking points other than the cross target and ruler; use the high-precision digital camera to take pictures of the measured object containing the cross target and ruler, change the shooting position and angle and continue to shoot the measured object, and collect at least 3 pictures The image of the measured object containing the cross target; use the high-precision digital camera to continue to take pictures of the measured o...

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Abstract

The invention relates to a code point and computer vision based method for measuring key points of a vehicle frame, belonging to the field of reverse engineering. The method comprises the steps of: pasting digital stereoscopic coding mark points to key positions of the vehicle frame, and placing a cross target pasted with the code mark points and a ruler near an object, wherein a high-precision digital camera is adopted; firstly, carrying out image acquisition on different directions of the objected to be measured; resolving the three-dimensional coordinates of certain pixel points of the mark points through the acquired images; and further obtaining the coordinate information of the key point of the vehicle frame though the acquired images and the three-dimensional coordinate information of the mark points by combining with an algorithm so as to provide data base for the subsequent vehicle frame matching. The algorithm provided by the invention for resolving the key points of the vehicle frame enriches the basic theory of three-dimensional vision measurement, provides a foundation for the reverse engineering and the three-dimensional vision detection theory and improves the level of the manufacture industry in China.

Description

technical field [0001] The present invention relates to a measurement system for reverse engineering, more specifically, the present invention relates to a key point measurement system and measurement method for reverse engineering based on three-point coding marking point frame. Background technique [0002] The execution of reverse engineering requires a full understanding of the characteristics of the product and the production process. In reality, many products are composed of free-form surfaces (such as motorcycle shape design, mold manufacturing, etc.). To complete the construction of such a model, you must Make precise identification of grooves, openings or other features on the model to complete the construction of the model. It is not enough to rely on experienced engineers to process the data of each point correctly to measure the coordinate information of key points, which may take too long or cause large errors. If equipped with suitable instruments, it can achie...

Claims

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Application Information

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IPC IPC(8): G01B11/00G01B11/03
Inventor 宋丽梅张春波
Owner TIANJIN POLYTECHNIC UNIV
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