Evaluation of super-resolution algorithm for detection and recognition of features from MODIS and OLI images at sub-pixel scale using Hopfield Neural Network
Subject Areas : Journal of Radar and Optical Remote Sensing and GISMohammad Hosein Mehrzade Abarghooee 1 , Ali Sarkargar Ardakani 2
1 - Ms in GIS&RS,Yazd Branch, Islamic Azad University, Yazd, Iran
2 - GIS&RS Department, Yazd Branch, Islamic Azad University, yazd, Iran
Keywords: Super resolution, Land cover, Fuzzy classification, Hopfield Neural Network, Spatial resolution, Subpixel, Energy function,
Abstract :
Fuzzy classification techniques have been developed recently to estimate the classcomposition of image pixels, but their output provides no indication of how theseclasses are distributed spatially within the instantaneous field of view represented bythe pixel. Super-resolution land-cover mapping is a promising technology forprediction of the spatial distribution of each land-cover class at the sub-pixel scale.This distribution is often determined based on the principle of spatial dependence andfrom land-cover fraction images derived with soft classification technology. As such,while the accuracy of land cover target identification has been improved using fuzzyclassification, it remains for robust techniques that provide better spatial representationof land cover to be developed. An approach was adopted that used the output from afuzzy classification to constrain a Hopfield neural network formulated as an energyminimization tool. The network converges to a minimum of an energy function. Thisenergy minimum represents a “best guess” map of the spatial distribution of classcomponents in each pixel. The technique was applied to remote sensing imagery(MODIS & OLI images), and the resultant maps provided an accurate and improvedrepresentation of the land covers. Low RMSE, high accuracy. By using a Hopfieldneural network, more accurate measures of land cover targets can be obtained, The Hopfield neural network used in this way represents a simple, robust, and efficienttechnique, and results suggest that it is a useful tool for identifying land cover targetsfrom remotely sensed imagery at the sub-pixel scale. The present research purpose wasevaluation of HNN algorithm efficiency for different land covers (Land, Water,Agriculture land and Vegetation) through Area Error Proportion, RMSE andCorrelation coefficient parameters on MODIS & OLI images and related ranking,results of present super resolution algorithm has shown that according to precedence,most improvement in feature’s recognition happened for Water, Land, Agricultureland and ad last Vegetation with RMSEs 0.044, 0.072, 0.1 and 0.108.