摘要
PCB缺陷检测系统中,图像的配准精度直接影响着整个系统的检测精度。针对PCB板标准图像和待测图像本身存在差异,传统方法用标准图像来配准待测图像的精度较低的问题,文中通过引入Gerber文件,对标准PCB板图像和待测PCB板图像进行二次配准,并对配准后的图像进行坐标修正。对采集的大尺寸PCB图像进行配准实验,结果显示配准偏移可控制在1-2个像素范围内,配准精度得到很大提高。
The accuracy of image matching would affect the detection accuracy of the PCB defect detection system. The standard PCB image and the test PCB image were different. The accuracy of traditional method using the standard PCB image to match the test PCB image was low. In this paper, the standard PCB image and the test PCB image were both matched with the Gerber. Then we corrected the coordinate value of the matched image. After the experiments for the matching of large-size PCB images, the experimental results showed that the offset of image matching could be controlled in the range of 1-2 pixels, so the accuracy for the matching was improved.
出处
《电子设计工程》
2016年第3期166-168,共3页
Electronic Design Engineering
