Stripe codeword matching method based on sequence feature repetition

Abstract

The invention relates to a stripe code word matching method based on sequence feature repeatability, which is characterized in that a computer is used to generate a color-coded stripe structured light pattern, and the pattern is projected onto the surface of an object to be measured by a projector, and a camera is used to Collect the modulated fringe pattern, solve the sequence characteristic gradient value of the collected fringe pattern, and find the codeword eigenvalue with the smallest sequence repetition degree, as the matching nuclear codeword, use the nuclear codeword and sequence repetition degree Carry out matching bar code word. It effectively solves the non-continuous code word matching problem, and has the advantages of low time complexity compared with the dynamic programming method.

Description

technical field [0001] The invention relates to a stripe codeword matching method based on sequence feature repetition, and belongs to the technical field of computer vision. Background technique [0002] In the 3D reconstruction technology based on color structured light fringes, the decoding process of the modulated color fringes involves three key issues of color fringe codeword detection, recognition and matching. The accuracy of matching between the collected modulated stripe codewords directly determines the accuracy of 3D reconstruction. The mathematical model of stripe code word matching is the problem of optimizing the matching of the sequence. In the process of optimizing the matching, it usually assumes global consistency or local consistency, and the global consistency mainly means that the order of the code values ​​​​in the sequence does not change. The more classic methods of this kind are the dynamic programming method and the crystal growth method. The cor...

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Problems solved by technology

However, since the object to be tested is at a non-continuous position, it is very easy to cause cross-matching errors of the stripe codewords. For this reason, Zhang et al. proposed a dynamic programming stripe codeword matching method. The basic idea is to convert the original color The stripe codeword sequence and the modulated color stripe codeword sequence collected by the camera are used as two scanning lines for multiple dynamic programming matching, and the cut-off condition of dynamic programming is limited by setting a threshold

Although the above method can match the modulated stripe codewords, there is a problem of matching errors when the objects to be tested are cross-matched, and the dynamic programming method has the problem of high time complexity.

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