目前的自动光学检测技术受到以下两方面的挑战:难以获取足够数量的缺陷样本,且种类极不平衡;外观缺陷形态多样,种类复杂。上述问题严重影响偏光片外观缺陷的检测精度和效率。基于此,提出一种无需真实缺陷样本的深度对抗异常检测方法。...目前的自动光学检测技术受到以下两方面的挑战:难以获取足够数量的缺陷样本,且种类极不平衡;外观缺陷形态多样,种类复杂。上述问题严重影响偏光片外观缺陷的检测精度和效率。基于此,提出一种无需真实缺陷样本的深度对抗异常检测方法。采用编码器捕获条纹结构光缺陷图像的规律性特征,并通过解码器重建出无缺陷图像,再通过一个编码器模块构成无监督对抗网络,最后根据重建图像与样本图像的差异计算异常得分。在训练阶段加入合成缺陷,同时改进目标潜在损失函数,进一步提高检测精度。在一个考虑光照不均衡、噪声、相机畸变等因素的偏光片外观缺陷数据集上的实验结果表明,所提方法测试结果的area under curve达到97.9%,单张图像平均检测时间为19.2 ms,检测准确率为94.6%,均优于GANomaly等方法,验证了其有效性与鲁棒性。展开更多
A system reliability model based on Bayesian network(BN)is built via an evolutionary strategy called dual genetic algorithm(DGA).BN is a probabilistic approach to analyze relationships between stochastic events.In con...A system reliability model based on Bayesian network(BN)is built via an evolutionary strategy called dual genetic algorithm(DGA).BN is a probabilistic approach to analyze relationships between stochastic events.In contrast with traditional methods where BN model is built by professionals,DGA is proposed for the automatic analysis of historical data and construction of BN for the estimation of system reliability.The whole solution space of BN structures is searched by DGA and a more accurate BN model is obtained.Efficacy of the proposed method is shown by some literature examples.展开更多
文摘目前的自动光学检测技术受到以下两方面的挑战:难以获取足够数量的缺陷样本,且种类极不平衡;外观缺陷形态多样,种类复杂。上述问题严重影响偏光片外观缺陷的检测精度和效率。基于此,提出一种无需真实缺陷样本的深度对抗异常检测方法。采用编码器捕获条纹结构光缺陷图像的规律性特征,并通过解码器重建出无缺陷图像,再通过一个编码器模块构成无监督对抗网络,最后根据重建图像与样本图像的差异计算异常得分。在训练阶段加入合成缺陷,同时改进目标潜在损失函数,进一步提高检测精度。在一个考虑光照不均衡、噪声、相机畸变等因素的偏光片外观缺陷数据集上的实验结果表明,所提方法测试结果的area under curve达到97.9%,单张图像平均检测时间为19.2 ms,检测准确率为94.6%,均优于GANomaly等方法,验证了其有效性与鲁棒性。
基金National Natural Science Foundation of China(No.61203184)
文摘A system reliability model based on Bayesian network(BN)is built via an evolutionary strategy called dual genetic algorithm(DGA).BN is a probabilistic approach to analyze relationships between stochastic events.In contrast with traditional methods where BN model is built by professionals,DGA is proposed for the automatic analysis of historical data and construction of BN for the estimation of system reliability.The whole solution space of BN structures is searched by DGA and a more accurate BN model is obtained.Efficacy of the proposed method is shown by some literature examples.