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The improved regression imputation (RI) based on Brownian motion in this paper performs better than the traditional RI when dealing with the missing degradation data. The imputation data of improved RI is more similar to the real degradation data, because Brownian motion can describe the fluctuation of degradation data better. And the imputation data of the improved RI also has smaller error than...
We apply a method of image quality assessment based on structure similarity (SSIM) to images including regions of interest (ROIs). A gradient-based SSIM model that takes the gradient as the main structural information is used among ROIs, while the classical SSIM model is followed in other regions. Then the final image quality index is evaluated after weights-taxed averaging of indexes in every region...
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