One-Class Risk Estimation for One-Class Hyperspectral Image Classification

Hyperspectral imagery (HSI) one-class classification is aimed at identifying a single target class from the HSI by using only knowing positive data, which can significantly reduce the requirements for annotation. However, when one-class classification meets HSI, it is difficult for classifiers to find a balance between the overfitting and underfitting of positive data due to the problems of distribution overlap and distribution imbalance. Although deep learning-based methods are currently the mainstream to overcome distribution overlap in HSI multi-classificaiton, few researches focus on deep learning-based HSI one-class classification. In this paper, a weakly supervised deep HSI one-class classifier, namely HOneCls is proposed, where a risk estimator—the One-Class Risk Estimator —is particularly introduced to make the full convolutional neural network (FCN) with the ability of one class classification in the case of distribution imbalance. Extensive experiments (20 tasks in total) were conducted to demonstrate the superiority of the proposed classifier.