基于卷积-自动编码机的三维形状特征学习

摘要

三维形状特征在三维物体分类、检索和语义分析中起着关键的作用. 传统的三维特征设计过程繁复, 而且不能从已有的大量三维数据中自动学习而得. 在深度神经网络的研究领域中, 卷积神经网络和自动编码机是比较流行的 2 种网络结构. 在超限学习机的框架之下, 将两者结合起来, 提出一种基于卷积-自动编码机的三维特征自动学习方法. 实验结果表明, 文中方法的特征学习速度比其他深度学习方法提高约2个数量级, 且提取的特征在三维模型分类、三维物体检测等任务中都取得了良好的结果.%3D shape features play a crucial role in graphics applications like 3D shape matching, recognition, and retrieval. Traditional 3D descriptors are hand-crafted features which are labor-intensively designed and are unable to extract discriminative information from existing large-scale 3D data. Convolutional neuron networks and auto-encoders are two most popular neuron networks in the field of deep learning. Based on the framework of extreme learning machines, we propose a rapid 3D feature learning method—convolutional extreme learning machine auto-encoder, which could automatically learn shape features from 3D shape dataset. Our method runs faster than existing deep learning methods by approximately two orders of magnitude. Experiments show that our method is superior to traditional machine learning methods based on hand-crafted features and other deep learning methods in tasks of 3D shape classification and 3D object detection.