A Telecentric Microscopic Binocular Stereo Vision Measurement Method Based on Digital Speckle

Abstract

The invention discloses a digital speckle-based telecentric microscopic binocular stereoscopic vision measurement method. The method includes the following steps that: 1) a telecentric microscopic binocular stereoscopic vision measurement platform is built; 2) the measurement platform is calibrated, the inner and outer parameters and relative position relations of a left telecentric camera and a right telecentric camera are determined; 3) a digital speckle pattern is projected onto the surface of a tiny object through a projector; 4) the left telecentric camera and the right telecentric camera are utilized to simultaneously shoot the to-be-measured tiny object of which the surface is covered with the digital speckle pattern, and a left speckle pattern and a right speckle pattern are acquired; 5) image matching is performed on the left speckle pattern and the right speckle pattern, matching relations of corresponding points in the left speckle pattern and the right speckle pattern are obtained, and the three-dimensional point cloud data of the tiny object are obtained according to the inner and outer parameters and relative position relations of the left telecentric camera and the right telecentric camera; and 6) the three-dimensional form of the tiny object is reconstructed according to the three-dimensional point cloud data, and the three-dimensional size information of the to-be-measured tiny object is obtained. The digital speckle-based telecentric microscopic binocular stereoscopic vision measurement method has the advantages of fast measurement speed, high measurement precision and the like.

Description

technical field [0001] The invention belongs to the field of stereo vision measurement, and more specifically relates to a telecentric microscopic binocular stereo vision measurement method based on digital speckle. Background technique [0002] As a non-contact measurement method, binocular stereo vision technology is widely used in three-dimensional measurement of object size. At present, the technology is mainly divided into two categories: traditional passive binocular stereo vision measurement and active binocular stereo vision measurement based on structured light. Passive binocular stereo vision measurement technology obtains the 3D coordinate value of the same 3D space point based on the parallax in the images taken by two cameras at different spatial positions and the spatial geometric relationship between the cameras, and then obtains A three-dimensional measurement of the size of an object. Active binocular stereo vision measurement technology actively creates f...

AI Technical Summary

Problems solved by technology

In the microscopic field, the three-dimensional measurement of microscopic digital speckle based on stereo microscope has problems such as fixed optical path, small longitudinal measurement range, and low measurement accuracy; while the combination of scanning electron microscope (SEM) and atomic force microscope (AFM) Microscopic digital speckle three-dimensional measurement requires measurement from multiple angles, expensive measurement equipment, cumbersome measurement process, and a small measurable range

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