边坡测量中标志点的设计与识别

The Design and Recognition of Mark Point in Image- based Outdoor Measurement

在基于图像方式的户外测量中,广泛使用标志点。然而,现有标志点识别与定位精度却不高。针对基于图像方式户外测量中标志点识别与定位不准确问题,提出了标志点设计与识别方法。该方法首先给出了标志点的颜色设计方案和大小设计方法;然后提出了基于HSI颜色空间的标志点识别、定位方法,包括采用HSI颜色空间的图像二值化、采用形状准则的标志点筛选、采用二次椭圆拟合的标志点中心定位等;最后进行了实验验证。实验表明,本方法设计的标志点及识别方法精度较高,适合应用到基于图像方式的户外视觉测量中。

Mark point is widely used in image - based outdoor measurement. However, the existing method of mark point recognition and location is inaccuracy. Aimed at the inaccuracy of mark point recognition and location in image - based outdoor measurement, we proposed a method of mark point design and recognition. This method first designed the color and size of mark point, and then presen- ted the recognition and location method based on HSI color space, which include the image binarization by HIS color space, the screening by shape criteria, and the center location by secondary ellipse fitting. Finally the method was tested experimentally. The ex- periment results show that the method is more accuracy, and suitable for image - based outdoor vision measurement.