工业CT图像的二维几何测量方法研究

2D Geometric Measurement Method Based on Industrial CT Images

为实现对物体内部结构尺寸的无损测量,提出一种基于阈值化边缘提取的工业CT图像几何尺寸的自动测量方法。首先对CT图像进行预处理,然后采用最佳阈值分割方法进行边缘提取,在此基础上实现了对工件的CT图像的几何尺寸的自动测量。实验结果表明:对图像的几何测量达到了一定的精度,基本上满足了可重复性和精确度的要求。同时这种方法对于有伪影的图像,可以有效地减少伪影的影响。

To achieve the non-destructive measurement of the internal structure of the objects, a kind of automatic dimension measuring method using industrial computed tomography （ICT） images was presented based on a threshold of edge extraction. First, a pretreatment of CT images was carried out. Then,the best threshold segmentation method was used to extract edge, based on this work the automatic geometry measurement of the CT images was achieved. The results show that geometric measurement of images reaches to a certain degree of accuracy and meet the basic needs of accuracy and repeatability. Simultaneously this method may reduce the influence of artifacts.