MRF-Based Multispectral Image Fusion Using an Adaptive Approach Based on Edge-Guided Interpolation

TL;DR

This paper proposes an adaptive, edge-guided interpolation method to enhance multispectral image fusion quality, specifically improving color and detail in Landsat-8 images by focusing on interpolation techniques rather than fusion algorithms.

Contribution

It introduces a novel adaptive, edge-guided interpolation approach that improves multispectral image fusion quality over traditional methods like bi-linear and bi-cubic interpolation.

Findings

Adaptive interpolation improves fusion quality.

Edge-guided method enhances color and detail.

Numerical simulations confirm better results.

Abstract

In interpretation of remote sensing images, it is possible that some images which are supplied by different sensors become incomprehensible. For better visual perception of these images, it is essential to operate series of pre-processing and elementary corrections and then operate a series of main processing steps for more precise analysis on the images. There are several approaches for processing which are depended on the type of remote sensing images. The discussed approach in this article, i.e. image fusion, is the use of natural colors of an optical image for adding color to a grayscale satellite image which gives us the ability for better observation of the HR image of OLI sensor of Landsat-8. This process with emphasis on details of fusion technique has previously been performed; however, we are going to apply the concept of the interpolation process. In fact, we see many important software tools such as ENVI and ERDAS as the most famous remote sensing image processing tools have only classical interpolation techniques (such as bi-linear (BL) and bi-cubic/cubic convolution (CC)). Therefore, ENVI- and ERDAS-based researches in image fusion area and even other fusion researches often dont use new and better interpolators and are mainly concentrated on the fusion algorithms details for achieving a better quality, so we only focus on the interpolation impact on fusion quality in Landsat-8 multispectral images. The important feature of this approach is to use a statistical, adaptive, and edge-guided interpolation method for improving the color quality in the images in practice. Numerical simulations show selecting the suitable interpolation techniques in MRF-based images creates better quality than the classical interpolators.