Superpixelwise Low-rank Approximation based Partial Label Learning for Hyperspectral Image Classification

TL;DR

This paper introduces SLAP, a novel superpixelwise low-rank approximation method for partial label learning in hyperspectral image classification, effectively disambiguating labels and improving classification accuracy.

Contribution

SLAP is the first method to incorporate partial label learning with superpixelwise low-rank approximation for hyperspectral images, enhancing label disambiguation and classification performance.

Findings

SLAP outperforms state-of-the-art methods in hyperspectral image classification.

The superpixelwise LRA effectively disambiguates ambiguous labels.

Experimental results demonstrate significant accuracy improvements.

Abstract

Insufficient prior knowledge of a captured hyperspectral image (HSI) scene may lead the experts or the automatic labeling systems to offer incorrect labels or ambiguous labels (i.e., assigning each training sample to a group of candidate labels, among which only one of them is valid; this is also known as partial label learning) during the labeling process. Accordingly, how to learn from such data with ambiguous labels is a problem of great practical importance. In this paper, we propose a novel superpixelwise low-rank approximation (LRA)-based partial label learning method, namely SLAP, which is the first to take into account partial label learning in HSI classification. SLAP is mainly composed of two phases: disambiguating the training labels and acquiring the predictive model. Specifically, in the first phase, we propose a superpixelwise LRA-based model, preparing the affinity graph for the subsequent label propagation process while extracting the discriminative representation to enhance the following classification task of the second phase. Then to disambiguate the training labels, label propagation propagates the labeling information via the affinity graph of training pixels. In the second phase, we take advantage of the resulting disambiguated training labels and the discriminative representations to enhance the classification performance. The extensive experiments validate the advantage of the proposed SLAP method over state-of-the-art methods.