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Language-Informed Hyperspectral Image Synthesis for Imbalanced-Small Sample Classification via Semi-Supervised Conditional Diffusion Model

Although data augmentation is an effective method to address the imbalanced-small sample data (ISSD) problem in hyperspectral image classification (HSIC), most methodologies extend features in the latent space. Few, however, generate realistic and diverse samples using text information to balance the limited number of annotated samples. Recently, text-driven diffusion models have gained significant attention due to their remarkable ability to generate highly diverse images based on given text prompts in natural image synthesis. Therefore, this paper proposes a novel language-informed hyperspectral image synthesis method (Txt2HSI-LDM(VAE)) for addressing the ISSD problem of HSIC. First, for addressing the high-dimensional hyperspectral data, we use universal varitional autoencoeder (VAE) to map the hyperspectral into a low-dimensional latent space and get stable feature representation, which hugely reduce the inference parameter of diffusion model. Next, a semi-supervised diffusion model is designed for fully taking advantage of unlabeled data, beside, random polygon spatial clipping (RPSC) and uncertainty estimation of latent feature (LF-UE) are also used for simulating the varying degrees of mixing of training data. Then, VAE decodes HSI from latent space generated by diffusion model with the conditional language as input, contributing to more realistic and diverse samples. In our experiments, we fully evaluate the effectiveness of synthetic samples from aspect of statistical characteristic and data distribution in 2D-PCA space. Additionally, cross-attention map is visualized on the pixel-level to prove that our proposed model can capture the spatial layout of and geometry of the generated hyperspectral image depend on the visual-linguistic alignment.

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