Restoration of multispectral images by total variation with auxiliary image

摘要

In this paper, the restoration of a degraded image with an auxiliary image from another sensor is considered. In a typical multispectral satellite imaging system, multiple images from different sensors of the same area are available. When one of those images in a multiple image set is degraded, another image in the set can be used as a prior image for restoration. A hybrid algorithm based on the total variation approach using an auxiliary image is proposed in this paper. In this approach, the cost function for regularization has two terms: error from the degraded image being restored and the error from the auxiliary image. The amount of prior information from the auxiliary image to be used in the hybrid algorithm is determined based on the similarity between the auxiliary image and the degraded image. An algorithm, based on normalized local mutual information, is developed to estimate the amount of prior information to apply. The proposed algorithm is applied to both simulated and real multispectral images, and the performance of the proposed algorithm is compared with those of other image restoration algorithms. In both quantitative and qualitative comparisons, the proposed algorithm performed better than other algorithms.