Superpixel-Based Mixed Noise Estimation for Hyperspectral Images Using Multiple Linear Regression

Abstract

HSIs (hyperspectral images) obtained by new-generation hyperspectral sensors contain both electronic noise and photon noise with comparable power. Therefore, both the SI (signal-independent) component and the SD (signal-dependent) component have to be considered. In this paper, a superpixel-based noise estimation algorithm using MLR (multiple linear regression) is proposed for the above mixed noise to estimate the noise standard deviation of both SI component and SD component. First, superpixel segmentation is performed on the first principal component obtained by MNF (minimum noise fraction)-based dimensionality reduction to generate non-overlapping regions with similar pixels. Then, MLR is performed to remove the spectral correlation, and a system of linear equations with respect to noise variances is established according to the local sample statistics calculated within each superpixel. By solving the equations in terms of the least-squares method, the noise variances are determined. The experimental results show that the proposed algorithm provides more accurate local sample statistics, and yields a more accurate noise estimation than the other state-of-the-art algorithms for simulated HSIs. The results of the real-life data also verify the effectiveness of the proposed algorithm.

A Noise Estimation Method for Hyperspectral Image Based on Stacked Autoencoder

“…For hyperspectral images, images in each band can be treated as a single static image [17], with different sizes of noise in different bands.…”

The Quality of Remote Sensing Optical Images from Acquisition to Users

“…Continuing the presentation of the papers of the special issue, two of them [3,4] consider the blurring effects and noise introduced into the images by the acquisition system.…”

“…Regarding [4], the authors propose a superpixel-based noise estimation algorithm suitable for hyperspectral images acquired by new-generation hyperspectral sensors. For this reason, the methodology considers both electronic and photon noise.…”