Method for measuring key point of car frame based on coding points and computer vision

Abstract

The invention belongs to the field of reverse engineering, in particular to a method for measuring a key point of a car frame based on coding points and computer vision. The method comprises the following steps of: sticking a digital three-dimensional coding mark point to a key position of the car frame, placing a cross target and a scale stuck with coding mark points near an object, and firstly acquiring pictures of the object to be measured in different directions by using a high-precision digital camera; calculating three-dimensional coordinates corresponding to certain pixel points of the mark point through the acquired pictures; and acquiring the coordinate information of the key point of the car frame by combining an algorithm through the acquired pictures and the three-dimensional coordinate information of the marker point so as to provide data basis for subsequent car frame matching. The method for measuring the key point of the car frame enriches the three-dimensional vision measurement basic theory, lays the foundation for the reverse engineering and the three-dimensional vision detection theory, and improves the manufacture level 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 of a vehicle frame based on coding points and computer vision for reverse engineering. 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...

AI Technical Summary

Problems solved by technology

However, the single measurement range of the grating measurement method is small. For large objects, it needs to be realized by multiple splicing, so it will accumulate a large error, and it is not easy to realize the global control of the error.

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