灰度累积投影直方图在胎冠缺陷检测中的应用

针对轮胎胎冠帘线搭接缺陷的自动检测问题，提出一种基于胎冠X射线图像的检测方法。首先，依据胎冠的X射线影像和投影角计算胎冠成像的灰度累积投影曲线；然后，计算曲线的局部峰值能量分布；其次，采用前n个最大峰值能量构造投影曲线的能量特征向量，并利用支持向量机(SVM)分类器进行最大投影曲线的判别；最后，利用位置反演计算对缺陷进行定位。仿真实验结果表明，所提方法可以对生产过程中采集的1000幅胎冠图像进行有效的缺陷检测，其最高检测正确率可达97.7%。

Application of gray cumulative projection histogram in detection of tire crown crack

For automatic detection of tire crown cord overlap defect, a detection method based on the crown X ray image was presented. Firstly, the gray cumulative projection curves that X-ray image was projected along different angles were obtained. Secondly, the local peak energy distribution of curves were calculated and the energy feature vector was constructed by the n largest peak energy values. Thirdly, the tire crown crack image was recognized by the maximum projection curve which could be distinguished through the energy feature vector by Support Vector Machine (SVM). Lastly, using the position inverse calculation, the tire crown crack was located. The experimental results demonstrate that the proposed approach was effective to detect the defects of tire crown which caused by tire cord overlap. The highest rate of correct detection can reach 97.7% in the 1000 crown images collected by the process of production.