Research On One-touch Size Measurement Software Based On Sub-pixels

With the continuous development of precision manufacturing,the standards for dimensional accuracy of related products such as precision parts and precision electronics are constantly improving.High-precision,full-field-of-view,high-efficiency,and high-intelligence dimensional measurement have become the trend of the future.The demand for dimensional measurement in precision manufacturing industry has evolved from spot inspection to full inspection,off-line to on-line,and manual development to automation.Traditional optical measurement equipment has been difficult to meet demand.The one-button measuring instrument combines the optical,mechanical,electrical,soft,and computational technologies to effectively solve the contradiction between the imaging range and measurement accuracy.Its large field of view,high depth of field,and multiple measurements at one time improve the detection efficiency.Accuracy can effectively meet the needs of precision manufacturing and improve the efficiency and accuracy of dimensional measurement.This article examines the following:(1)Design of one-touch meter software.For the functional requirements of the one-button measuring instrument,a software architecture of the system is proposed and a specific implementation scheme of the software module is proposed.The entire software architecture is divided into a core tool layer,a business logic layer,and a display and interaction layer.The entire software system is based on the windows operating system design,using object-oriented C++ language development,the entire interactive design using Qt design framework.Practice has proved that the software can achieve high-efficiency human-computer interaction and enhance the automation of one-touch measurement.(2)Research on one-touch edge detection algorithm.First,image preprocessing operations(including image filtering and image edge extraction)are performed for the features of the one-button measuring instrument.This paper compares and analyzes the mainstream image preprocessing methods.Finally,it selects a robust algorithm,solves the noise interference of the collected images,and improves the quality of the acquired images,which provides guarantee and help for the later image processing.Then the principle of the current mainstream sub-pixel edge detection algorithm is compared and analyzed,and the existing problems are analyzed.A step-by-step sub-pixel detection algorithm is proposed.Experiments show that the algorithm is more accurate and faster than traditional methods.Can achieve faster and more accurate sub-pixel level edge location.(3)Study of calibration in one-button measuring instruments.In the traditional calibration method,this paper changes the accuracy of the feature points to sub-pixel level and achieves more accurate camera calibration.For the calculation of the dimensions of straight lines,arcs and basic elements in the one-button measuring instrument,this paper uses the classical geometric relation calculation method to calculate these basic elements.The software and algorithm proposed in this paper have been successfully applied to the one-button measuring instrument,enabling the measurement accuracy of the entire one-button measurement software to reach 3 ?m,the measurement time of a single object within 1.2 s,and the measurement range up to 50 mm,satisfying one The actual application requirements of the key gauge.