AN improved dark-pixel subtraction method and its application in a pansharpening method taking into accout haze

The fusion of low-spatial-resolution multispectral (MS) bands and a high-spatial-resolution (HSR) panchromatic (PAN) band obtained by the same sensor is desirable to produce high quality, HSR MS images. Due to the significant effect of haze values on spectral direction of pixels in the fused images, a fusion method taking into account haze, which is referred as Haze- and Ratio- based (HR) method, is demonstrated to yield better performance than some other methods. In this HR method, haze values are determined by the minimal gray values of each of the MS bands and the PAN band. Obviously, these minimal values correspond to different pixels in different bands, which may cause unstable performance of the method. In order to yield a reasonable and stable approach for the determination of haze values, an improved dark-pixel subtraction method is proposed to determine the haze values used in the HR method in this study.

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