A pan-sharpening method based on the ADMM algorithm
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Pan-sharpening is a method of integrating low-resolution multispectral images with corresponding high-resolution panchromatic images to obtain multispectral images with high spectral and spatial resolution. A novel variational model for pan-sharpening is proposed in this paper. The model is mainly based on three hypotheses: 1) the pan-sharpened image can be linearly represented by the corresponding panchromatic image; 2) the low-resolution multispectral image is down-sampled from the highresolution multispectral image through the down-sampling operator; and 3) the satellite image has the low-rank property. Three energy components corresponding to these assumptions are integrated into a variational framework to obtain a total energy function. We adopt the alternating direction method of multipliers (ADMM) to optimize the total energy function. The experimental results show that the proposed method performs better than other mainstream methods in spectral and spatial information preserving aspect.
Keywordspan-sharpening multispectral image panchromatic image variational framework energy function ADMM
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We sincerely thank the editor and reviewers for their insightful comments and constructive suggestions on the article, and thank Dr. Thomas James Godfrey for helping us to revise the grammar. This work was supported in part by “Chenguang Program” supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission (Grant No. 17CG25), in part by the Key Project of the National Natural Science Foundation of China (Grant No. 61731009), and in part by the National Natural Science Foundation of China (Grant No. 61871185).
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