Análise quantitativa e qualitativa da técnica de fusão IHS aplicada a imagens do satélite Landsat8

Abstract

Image fusion can be defined as a method that combines images of different spectral and spatial characteristics to synthesize a new image with better spatial resolution than the original multispectral image. This paper shows the results of the quantitative and qualitative analysis of images fused by the IHS technique (intensity, hue and saturation), The area of study was the surroundings of the Itaparica reservoir, Pernambuco. The technique was applied to Landsat8 (Land Remote Sensing Satellite) images, where the OLI sensor bands 2,3,4,5 and 6 were used in the different combinations of RGB and fused by IHS with the panchromatic band to produce images with Better spatial resolution. The spatial resolution of Landsat 8 is 30 meters for the multispectral image and 15 meters for the panchromatic image. After processing, evaluations were made from visual observations and statistical measures such as: mean, variance, correlation and IQI (image quality index). It was possible to perceive visually the gain in the quality of the images, that is, a greater level of detail due to the increase of the spatial resolution. Statistical analysis showed that the best result was for bands 2, 3 and 4.