Detection method for circular figure

Abstract

A detection method for circular figure belongs to the field of electronic process. The detection method is characterized by comprising the following steps: (1) firstly, after a PCB image acquired by hardware equipment goes through preprocessing, a grey-scale map of the PCB image is obtained; (2) Hough transformation is performed on the PCB image after the preprocessing, only an image containing circular information is taken out, other irrelevant pixels are removed; and (3) finally, a circle fitting using a least square method is adopted, a relatively accurate circle is obtained, and then the radius and the center of the circle after the fitting are calculated. Through the fast Hough transformation and the least square fitting, detection for the circular image in a PCB is effectively completed, and the radius of the circular image and information of the circle can be obtained, so detection accuracy is improved, and working efficiency is also improved. The detection method for the circular figure has the advantages of the simple operation process, and is easy to popularize and use in a large area.

Description

technical field [0001] The invention belongs to the field of electronic technology, and in particular relates to a detection method of a circular figure. Background technique [0002] With the rapid development of the economy, the electronic information industry has also been rapidly improved. In the national economy and national defense, the microelectronics industry is playing an increasingly important role. At the same time, in the microelectronics industry, the PCB board is one of the key components. With the continuous emergence of new components, the requirements for PCB boards are becoming more and more stringent. As the density of components increases and the distance between pins becomes smaller, the fabrication of PCB boards will become more and more difficult. In order to effectively avoid various defects during the production of the PCB board and affect the subsequent process, the PCB board will be inspected during the production of the PCB board. According t...

AI Technical Summary

Problems solved by technology

Traditional manual inspection is becoming more and more inefficient, with high missed and false detection rates in the face of today's complicated PCB boards. Therefore, in order to improve efficiency and reduce the missed detection rate, new detection methods are constantly being used by people.