Monocular Dynamic Machine Vision-Based Pearl Shape Detection

In terms of the requirement of automatically sorting pearls, the pearl contour feature extraction and shape recognition algorithm are studied in this paper to reckon with the rapid identification of pearls shape online,and a monocular dynamic machine vision-based pearl shape detection device is designed. Through blowing, the pearl is suspended in a funnel shaped container and flipped rapidly in the device. The entire surface image of the pearl to be measured can be promptly grasped by the camera placed right above the funnel. The results of illumination experiments conducted from different angles indicate that the image contour acquired by the medium angle illumination is better extracted. The pearl shape test indicates that the method is incorporated with the inflatable suspension device to classify the pearls into seven types according to the national standard,and additionally the average error rate is confined under 5.38%. The shape characteristic of the pearl can be detected promptly and reliably, and accordingly the high-speed automatic sorting can be satisfied.     

汽车故障诊断技术的现状与发展趋势

汽车故障诊断技术是汽车电子控制技术的重要组成部分,在汽车维修工作中起重要作用.文中分析了我国汽车故障诊断技术的发展现状,并对未来汽车故障诊断技术的发展趋势进行了展望.