根据数字水准仪条码为不同宽度黑白交替出现的共性特征,提出了一种基于匹配图像与模板图像条目数相同且等宽原理的快速自适应相关匹配条码定位方法。通过对实测图像进行灰度化、剪切与校正等预处理来获取待匹配条码灰度图像,根据待匹配图像与模板图像条目数相同且等宽假设获取每次匹配时匹配图像缩放比例系数,并运用双线性插值方法将待匹配图像转换为与模板图像等宽的匹配图像,将自适应缩放实测图像与模板图像进行移位相关运算来实现条码的匹配与精确定位。水准测量高度实验结果表明:该方法充分利用了视场中条码图像整体信息,具有抗干扰能力强、不依赖编码规则、算法效率与精度高的特点,可广泛应用于不同编码规则条码标尺高度测量。

According to digital level barcode''s common characteristics of black and white alternation with different widths, a fast adaptive correlation matching barcode location method is proposed, which is based on equal stripe number and equal width between the matched image and the template image. The barcode grayscale image to be matched is obtained by preprocessing of graying, cutting and correcting of the proposed method. And every time the scale factor of the matched image is obtained according to the assumption of equal strip number and equal width between the matched image and the template image. The image to be matched is transformed to matched image with equal width as the template image using bilinear interpolation method. The matching and precise positioning of barcode are achieved after shift-related operation between the measured image of adaptive scaling and the template image. Leveling measurement experiment results show that this method makes full use of the whole information of barcode image, which has the characteristics of strong anti-interference ability, independence of coding rules, high algorithm efficiency and high precision,which can be widely used for height measurement of barcode level with different coding rules.