Satellite-borne panchromatic and multispectral image fusion method

Abstract

The invention provides a satellite-borne panchromatic and multispectral image fusion method. The satellite-borne panchromatic and multispectral image fusion method includes the steps: using Gaussian guided filtering to combine with a panchromatic image to complete resampling amplification of an original multispectral image; injecting the spatial detail information of the panchromatic image into the amplified multispectral image through the combination upsampling process, and then performing hyperspherical color transform (HCT) on the original multispectral image to extract the spectral information of the original multispectral image; and fusing the spectral information with the spatial information of the panchromatic image in the hyperspherical color space, and obtaining a multispectral image with high spatial resolution through HCT inverse transform. The satellite-borne panchromatic and multispectral image fusion method improves the spatial resolution of the resampled multispectral image, can be directly extended to fusion processing of the hyperspectral image, and is relatively higher in universality and practicality.

Description

technical field [0001] The invention relates to a visualization enhancement processing technology of a space-borne remote sensing image, in particular to an image fusion method of a space-borne panchromatic image and a multispectral image. Background technique [0002] Due to the physical limitations of the imaging sensor itself and the barriers of data transmission technology between the satellite and the ground, the current spaceborne imaging sensors can only provide multi-band multispectral images with high spectral resolution but low spatial resolution or high spatial resolution but spectral information. Poor single-band panchromatic images. On-orbit spaceborne sensors, such as GeoEye-1, WorldView-2 / 3 / 4, Gaojing-1, etc., can simultaneously provide multi-band multi-spectral remote sensing images and single-band panchromatic images with high spatial resolution. By fusing multispectral images and panchromatic images, the spatial resolution of multispectral images can be im...

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Problems solved by technology

In fact, the multispectral image obtained by the above interpolation method will have different degrees of spectral distortion and spatial information distortion, which will further affect the information preservation of the fused image (see the literature IEEE Geoscience and Remote Sensing Letters, 4(1):27-31, 2007; IEEE Journal of Selected Topics in Signal Processing, 5(3):446-453, 2011)

In addition, the classical interpolation method cannot improve the spatial resolution of the resampled enlarged image, because the external useful high-spatial-resolution detail information is not utilized in the interpolation process, so the definition of the resampled enlarged image has not been improved.

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