基于改进AlexNet的广域复杂环境下遮挡猕猴桃目标识别
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陕西省科技统筹创新工程计划项目(2015KTCQ02-12)


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    摘要:

    为了提高猕猴桃采摘机器人的工作效率和对猕猴桃复杂生长环境的适应性,识别广域复杂环境下相互遮挡的猕猴桃目标,采用Im-AlexNet为特征提取层的Faster R-CNN目标检测算法,通过迁移学习微调AlexNet网络,修改全连接层L6、L7的节点数为768和256,以解决晴天(白天逆光、侧逆光)、阴天及夜间补光条件下的广域复杂环境中猕猴桃因枝叶遮挡或部分果实重叠遮挡所导致的识别精度较低等问题。采集广域复杂环境中晴天逆光、晴天侧逆光、阴天和夜间补光条件下存在遮挡情况的4类样本图像共1823幅,建立试验样本数据库进行训练并测试。试验结果表明:该方法对晴天逆光、晴天侧逆光、阴天和夜间补光条件下存在遮挡情况的图像识别精度为96.00%,单幅图像识别时间约为1s。在相同数据集下,Im-AlexNet网络识别精度比LeNet、AlexNet和VGG16 3种网络识别精度的平均值高出5.74个百分点。说明该算法能够降低猕猴桃果实漏识别率和误识别率,提高了识别精度。该算法能够应用于猕猴桃采摘机器人对广域复杂环境下枝叶遮挡或部分果实重叠遮挡的准确识别。

    Abstract:

    To improve the applicability and efficiency of scaffolding cultivation kiwifruit harvesting robot in orchard, an efficient and accurate recognition method for multiple clusters characteristics of kiwifruits under farview and occlusion environment conditions were researched. Faster R-CNN was proposed for detecting kiwifruit. The Im-AlexNet model was used to recognize the farview and occluded fruit image, including the sunny backlight, sunny rembrandt light, cloudy, night with illumination condition. In addition, there was more obstructive among fruit clusters and branches and leaves of fruit trees. By modifying the number of nodes in full connection layer of AlexNet model by transfer learning, finetuning the number of nodes full connection layer L6, L7 to 768 and 256. The feature extraction of kiwifruit was more accurate, and the recognition result of occluded image of fruit contour was obtained. Through the recognition of 1823 multicluster kiwifruit images trained by Im-AlexNet, the experimental results indicated that the average precision (AP) of farview and occluded complex condition images was 96.00%, and the recognition speed reached 1s. By comparing with LeNet、AlexNet、VGG16 models of training the same datasets, the AP of Im-AlexNet was 5.74 percentage points higher than those of Faster R-CNN network, and the rate of false recognition and missing recognition of kiwifruit was reduced by Im-AlexNet. It was proved that deep learning can solve the problem of recognition results of farview complex weather and occluded fruit, and kiwifruit harvesting robot was suitable for kiwifruit detection in complex environment, it can also be applied to other farview multitarget and partially occluded target recognition.

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穆龙涛,高宗斌,崔永杰,李凯,刘浩洲,傅隆生.基于改进AlexNet的广域复杂环境下遮挡猕猴桃目标识别[J].农业机械学报,2019,50(10):24-34.

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  • 收稿日期:2019-06-20
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  • 在线发布日期: 2019-10-10
  • 出版日期: 2019-10-10