Polar correction based sub-pixel level phase three-dimensional matching method

Abstract

The invention belongs to the field of machine vision and relates to a polar correction based sub-pixel level phase three-dimensional matching method. The polar correction based sub-pixel level phase three-dimensional matching method mainly aims at the problem of three-dimensional matching efficiency and accuracy in a three-dimensional measuring system through a binocular structure projection gate phase method. According to the polar correction based sub-pixel level phase three-dimensional matching method, a binocular three-dimensional visual geometric structure is calibrated into a head-up binocular standard geometric structure, phases formed by a matching point in a left camera and a right camera are in the same horizontal line, a dense phase value of a calibrated new phase graph is obtained through bilinear interpolation, a phase area based three-dimensional matching algorithm is provided, an initial matching point is obtained, similarities within a 3*3 area close to the initial matching point are fit into a quadric surface through least square method based surface fitting, a local minimum of the surface is obtained, and coordinates of a right camera matching point with the same phase as a to-be-matched point are obtained. The polar correction based sub-pixel level phase three-dimensional matching method can rapidly and accurately achieve dense three-dimensional matching and satisfies a requirement for industrial applications.

Description

technical field [0001] The invention belongs to the field of machine vision, and in particular relates to a sub-pixel level phase stereo matching method based on epipolar correction, which can meet the requirements of high-efficiency and fast matching in industrial measurement. Background technique [0002] The binocular stereo vision measurement system based on the projected grating phase method is an important method for optical non-contact three-dimensional surface-intensive measurement. This method has the characteristics of rapidity and high precision, and is widely used in industrial measurement. The visual measurement system uses a digital projector to project grating stripes onto the surface of the object, and calculates the wrapped phase map containing the three-dimensional information on the surface of the measured object by collecting multiple frames of stripe images. The phase value is wrapped in [-π, π], and the corresponding The method unpacks the wrapped phas...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a sub-pixel level phase stereo matching method based on epipolar line correction, whose key technology can provide high-precision, high-efficiency matching methods for industrial measurement, and avoid traditional matching techniques Disadvantages such as large amount of calculation, slow speed, and low precision

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