Single order high precision large-sized object three-dimensional digitized measurement system and measurement method thereof

Abstract

The invention belongs to the field of image processing and pattern recognition and relates to a three-dimensional digital measurement method of a monocular high accuracy large-scale object. The method needs to attach a digital solid coding marking point at the key dimensional part of an object to be measured and put a cross target on which a coding marking point is attached beside the object, and the coding marking point can show the framework information of the object. A high accuracy digital camera is adopted first to collect images at four positions of the object to be measured; then an SCDP (Single Camera Different Position) method proposed by the invention is applied to obtain precision three-dimensional coordinate of the framework coding marking point, a space is divided into a plurality of sub-areas; inside the sub-areas, an SFMS (Shape From Multi Shading) method proposed in the invention is adopted to obtain the corresponding three-dimensional coordinate of each pixel point of images; and by combining with the color information of the coordinate, a color three-dimensional digital model of the object is consequently obtained to provide data foundation for the subsequent intelligent design. The SCDP and the SFMS method proposed in the invention enrich the basic theory of three-dimensional visualization measurement, lay a foundation for the monocular three-dimensional visualization detection theory and boost the level of Chinese manufacturing industry.

Description

technical field [0001] The invention relates to a measuring instrument for reverse engineering, more specifically, the invention relates to a monocular high-precision three-dimensional digital measuring system and a measuring method thereof 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. How to process the data of each point correctly to construct useful curves and surfaces? In this regard, it is not enough to rely solely on experienced engineers, which may take too long or have large errors. If equipped with suitable instruments, it can achi...

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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