基于数字图像处理的微内孔质量检测技术

Quality Inspection Technique of Micro Internal Hole with Digital Image Processing Technology

通过对微内孔边缘几何特征的研究,提出了一种有效检测微内孔质量的方法。通过中值滤波、灰度阈值变化等图像处理技术,准确地提取了微内孔的边缘,并将最小二乘圆拟合算法与一种新的圆度判定算法综合应用于微内孔的几何特征识别过程中。实验结果证明,该方法具有检测结果准、检测精度高等特点,能够满足微内孔质量检测的要求。

An effective approach of quality inspection for micro internal hole is proposed by studying on the geometric feature of micro internal hole edge. The edge of micro internal hole is detected exactly with the digital image processing techniques, such as, the middle value filter, the threshold value transformation, and so on. The least square circle fit arithmetic and a new roundness measurement arithmetic are synthetically used in the processing of geometric feature recognition of micro internal hole. The practical results prove that the method with exact conclusion and high precision can satisfy the quality inspection requirement of micro internal hole.