Method for three-dimensional measurement of high sampling density color structured light based on green stripe segmentation

Abstract

The invention relates to a method for the three-dimensional measurement of high sampling density color structured light based on green stripe segmentation. In previous researches, color encoding is mostly used for space encoding and direct encoding, and most of the color encoding can be used for measuring dynamic objects, but because of the influences caused by the color fidelity and the resolution ratio of a CCD camera, the color encoding has low measurement accuracy for three-dimensional objects and is very difficult to be used for accurate measurement of objects. The method comprises the following steps of: 1) continuously projecting red and blue gray code encoded structured light segmented based on green stripes to the three-dimensional objects required to be measured or reconstructed in turn, and shooting each breadth of projection patterns; 2) performing red, green and blue color stripe segmentation on each breadth of the shot projection patterns to acquire the color values of pixels of each breadth of the patterns; 3) extracting centers and left and right boundaries of the green stripes in each breadth of the shot patterns, and acquiring the coding values of the centers and the left and right boundaries of the green stripes according to the corresponding color values of the pixels of the previous breadths of the patterns; and 4) performing sub-pixel positioning on the centers and the left and right boundaries of the green stripes, and realizing the measurement and the reconstruction of the three-dimensional objects according to system calibration parameters. The method is applied to a three-dimensional measuring technique.

Description

Technical field: [0001] The invention relates to a visual sensing measurement technology, the field of three-dimensional information collection and reconstruction, and in particular to a three-dimensional measurement method of color structured light based on green stripe segmentation. Background technique: [0002] In non-contact 3D measurement technology, visual 3D measurement technology is one of the effective means to obtain 3D information of objects. It does not need to touch the surface of the measured object, and restores the 3D shape of the object based on the graphics and images obtained by the 3D visual sensor. , has the advantages of high speed, high efficiency, high degree of automation, and low cost. At present, the key development directions of visual three-dimensional measurement technology include structured light, stereoscopic image, moiré method, holographic method, laser radar and other methods. Among them, the structured light method has the advantages of ...

AI Technical Summary

Problems solved by technology

[0005] In previous studies, color coding is mostly used for spatial coding and direct coding, and most of them can be used for the measurement of dynamic objects. However, due to the influence of color fidelity and resolution based on CCD cameras, the measurement accuracy of three-dimensional objects is not high. Difficult to use for precise object measurement

In the existing several color time coding methods, the accuracy is improved compared with the spatial coding and direct coding, but there are also problems of color confusion and difficult identification due to the use of more than three colors, and usually the sampling density and low resolution

Images