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- W4383723573 abstract "The fog density level, as one of the indicators of weather conditions, will affect the management decisions of transportation management agencies. This paper proposes an image-based method to estimate fog density levels to improve the accuracy and efficiency of analyzing fine meteorological conditions and validating fog density predictions. The method involves two types of image entropy: a two-dimensional directional entropy derived from four-direction Sobel operators, and a combined entropy that integrates the image directional entropy and grayscale entropy. For evaluating the performance of the proposed method, an image test set and an image training set are constructed; and each image is labeled as heavy fog, moderate fog, light fog, or fog-free according to the fog density level of the image based on a user study. Using our method, the average accuracy rates of image fog level estimation were 77.27% and 79.39% on the training set using the five-fold cross-validation and the test set, respectively. Our experimental results demonstrate the effectiveness of the proposed combined entropy for image-based fog density level estimation." @default.
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- W4383723573 date "2023-07-07" @default.
- W4383723573 modified "2023-09-27" @default.
- W4383723573 title "Fog Density Evaluation by Combining Image Grayscale Entropy and Directional Entropy" @default.
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- W4383723573 doi "https://doi.org/10.3390/atmos14071125" @default.
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