Study On Geometric High Precision Measurement Technology Based On Binocular Stereo Vision

Geometric measurement is a process of quantifying geometric parameters such as length,angle,surface roughness,and surface shape of the measured object.As a new type of non-contact optical measurement method,binocular vision measurement is one of the important research topics to apply to geometric measurement.This paper mainly studies the high-precision measurement of the geometrical length of the measured object based on binocular vision measurement technology.With the rapid development of China’s manufacturing industry,product size inspection is a key link to its manufacturing process.At present,most industries mainly use mechanical and manual testing,and the measurement results have large errors and long periods.For some products that are not easy to measure,there may also be potential hazards to personal safety.Binocular vision measurement just makes up for the defects of traditional measurement.It can be widely used in various fields of product testing and has the advantages of high precision,high efficiency,and low economic cost.Therefore,the research on the high-precision measurement of binocular vision has important research value and application value.The paper aims to measure the size of the object,adopts the method of combining theoretical analysis and experimental research,and focuses on the system structure of binocular vision measurement,from the optical imaging system(camera)model,camera calibration,stereo correction,stereo matching,and other parts to carry out research.And completed experimental research using Visual Studio 2017 and the Open Source Computer Vision Library(Open CV).Finally,combined with the experimental research results,a binocular vision measurement device was built to measure the geometric dimensions of plane objects and three-dimensional objects.The relative error of the plane objects was less than 0.02%,and the relative error of three-dimensional objects was less than 0.7%.The experimental results can verify that the design of the binocular vision measurement device has certain feasibility and practicability.