基于深度学习的岩石薄片矿物自动识别方法

岩石薄片矿物识别是岩石学研究工作的基础，亦是进一步认识岩石种类、成因机理、物质运移和演化历史的基础。传统的矿物识别主要依靠光学显微镜进行人工鉴定，经济成本和时间成本较高、效率较低，且受制于专家个人经验与主观判断。随着深度学习技术的发展，计算机能从图像中自动提取更准确的语义信息，从而为岩石薄片图像的智能分析提供有效途径。提出了一种基于深度学习的岩石薄片矿物自动识别方法，利用深度卷积神经网络自动提取岩石薄片图像中不同矿物的有效特征，并对其进行语义分割与识别，综合利用单偏光与正交偏光2种光性图像实现了对矿物的自动识别。对南京大学岩石教学薄片显微图像数据集进行了矿物识别测试，结果表明，总体精度为86.7%，Kappa系数为0.818，识别结果较传统图像分类方法更准确。

Automatic identification of mineral in petrographic thin sections based on images using a deep learning method

The identification of minerals in petrographic thin sections is essentially required in petrological research, and is a prerequisite for further understanding of rock classification, petrogenesis, material flow and evolution history. Traditional methods rely on manual identification with optical microscope, which is costly, time-consuming, and subject to expert judgment and personal experience. Following the development of deep learning technology, it is possible for computer to automatically extract more accurate semantic information from images of petrographic thin sections. This paper proposes a deep learning-based method on petrographic thin section images for automatic mineral identification, which not only utilizes the deep convolutional neural network to extract different mineral features in the images for semantic segmentation and recognition, but also takes into account the plane polarized light images and cross polarized light images for comprehensive automatic identification. Our paper used the photomicrograph dataset of rocks for petrology teaching at Nanjing University for mineral identification and achieved the overall accuracy of 86.7% and Kappa coefficient of 0.818 demonstrating the advantage of the proposed approach compared with those of the traditional image classification methods.