Three-dimensional measuring method based on positive and inverse code color encoding stripes

Abstract

The invention relates to a three-dimensional measuring method based on positive and inverse code color encoding stripes, which comprises the following steps: selecting a group of color encoding stripes as main color encoding stripes, wherein the color encoding stripes have better performance and only contain a plurality of pure colors; obtaining the inverse codes of the color encoding stripes as auxiliary stripes, designing a color image segmenting method which is not influenced by the surface color of an measured object and illumination by combining a four-step phase shift method; accuratelyjudging the color of each pixel in the main color encoding stripes; then obtaining a periodically changing folding phase diagram from a four-step band 90-degree phase shift diagram; using the periodicboundary of folding phases as the boundary of each stripe in a color image segmenting diagram to further process the color image segmenting diagram, eliminate the noise effect, improve the precisionof color image segmentation, so as to further improve the precision of decoding and three-dimensional measurement.

Description

technical field [0001] The invention belongs to the technical field of three-dimensional information reconstruction, and realizes accurate three-dimensional measurement and reconstruction of objects with colored surfaces by sequentially projecting two sets of color-coded stripes with opposite codes on the surface of the measured object, combined with the four-frame phase shift method. In particular, it relates to a three-dimensional measurement method based on color-coded stripes of positive and negative codes. Background technique [0002] In recent years, color image processing technology has developed rapidly, and its application in three-dimensional measurement technology has become increasingly extensive and mature. The color grating technology in the structured light method is an important aspect of the application of color image processing in 3D measurement. The purpose of using color fringe coding, that is, projecting color grating, is to project a number of color f...

AI Technical Summary

Problems solved by technology

However, for a measured object with a colored surface, the color of the color-coded stripes projected onto the surface will be affected by the color of the object and change, so that the statistical distribution of the color in the collected image will also change, resulting in The threshold is not accurate, and the segmentation has a significant deviation

In addition, the purpose of color image segmentation in 3D measurement is to identify the color of the color-coded fringes projected onto the surface of the measured object while ignoring the color of the measured object, even though accurate segmentation is achieved using the histogram-based color image segmentation method, obtaining The changed color is also the changed color. If the color of the measured object is quite different from the color-coded stripe color on the surface, the changed color will also be quite different from the color-coded stripe color, which will still lead to serious misjudgment.

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